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What the docs quietly changed.
Anthropic's published documentation, fetched on a schedule and diffed against the last copy. Every edit dated, including the ones that never made a release note.
Last poll read all 4 cleanly: Claude Code CLI, Claude Developer Platform, Claude Documentation, Model Context Protocol. A date here is when this site noticed, not when Anthropic edited.
Claude Developer Platform
821pages tracked
774 changed this week · last read 23 Oct 2026
Claude Code CLI
228pages tracked
148 changed this week · last read 23 Oct 2026
Claude Documentation
280pages tracked
82 changed this week · last read 23 Oct 2026
Model Context Protocol
357pages tracked
171 changed this week · last read 23 Oct 2026
100 on this page
10,119 of the ledger's changes in api. Show every change
ReadSourcePageWhatLines
9 Oct 2026
560 pages
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api
managed-agents/self-hosted-sandboxes-workers
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managed-agents/self-hosted-sandboxes-workers
ARG ANT_VERSION=1.39.1
ARG ANT_VERSION=1.40.0
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managed-agents/self-hosted-sandboxes-custom-tools
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managed-agents/self-hosted-sandboxes-custom-tools
| `name` | Unique per agent. Letters, digits, underscores, and hyphens, 1–128 characters. Cannot match a built-in agent tool such as `bash` or `read`, or use the
| `name` | Unique per agent. Letters, digits, underscores, and hyphens, 1–128 characters. Cannot match a built-in agent tool such as `bash` or `read`, or use the
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managed-agents/reference
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managed-agents/reference
| `user.interrupt` | Stop the agent mid-execution.
| `user.interrupt` | Stop the agent mid-execution. It ends no [workflow run](https://platform.claude.com/docs/en/managed-agents/workflow-runs#interrupt-a-session-with-
| Type | Description
| -------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------
| `agent.message` | Agent response content blocks.
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managed-agents/quickstart
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managed-agents/quickstart
VERSION=1.39.1
VERSION=1.40.0
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
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managed-agents/permission-policies
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managed-agents/permission-policies
What you post in `user.message` events counts as your intent, and it can lead the server to allow a call it would otherwise deny. The server does not read intent from a tool result
What you post in `user.message` events counts as your intent, and it can lead the server to allow a call it would otherwise deny. The server does not read intent from a tool result
2. The session pauses with a `session.status_idle` event whose `stop_reason.type` is `requires_action`. The blocking event IDs are in the `stop_reason.event_ids` array. The session
2. The session pauses with a `session.status_idle` event whose `stop_reason.type` is `requires_action`. The blocking event IDs are in the `stop_reason.event_ids` array. The session
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managed-agents/multiagent-orchestration
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managed-agents/multiagent-orchestration
## How it works
All agents share the same sandbox, filesystem, and [vault credentials](https://platform.claude.com/docs/en/managed-agents/vaults), but each agent runs in its own **session thread**
Threads are persistent: the coordinator can send a follow-up to an agent it called earlier, and that agent retains everything from its previous turns.
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api
managed-agents/events-and-streaming
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managed-agents/events-and-streaming
No event resumes a session paused at its budget. The paused work resumes automatically when you change the budget to a value above the consumed list cost, or remove it. See [When a
No event you send resumes a session paused at its budget. The paused work resumes automatically when you change the budget to a value above the consumed list cost, or remove it. Wh
In a multiagent session, a subagent's blocking events are cross-posted to the primary thread. See [Tool permissions and custom tools](https://platform.claude.com/docs/en/managed-ag
In a multiagent session, a subagent's blocking events are cross-posted to the primary thread. See [Tool permissions and custom tools](https://platform.claude.com/docs/en/managed-ag
If the agent has [workflow runs](https://platform.claude.com/docs/en/managed-agents/workflow-runs) open, a custom tool call can arrive while the session stays `running`. The `requi
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api
managed-agents/budgets
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managed-agents/budgets
If [workflow runs](https://platform.claude.com/docs/en/managed-agents/workflow-runs#budgets-and-limits) are open, each one that isn't already idle also gets a `workflow_run.status_
A `user.interrupt` sent while the session is paused at its budget (all threads paused at the cap) is accepted and ignored: it does not appear in the event list and changes nothing.
A `user.interrupt` sent while the session is paused at its budget (all threads paused at the cap) is accepted and ignored: it does not appear in the event list and changes nothing.
Change or remove the budget with a session update. An accepted update resumes the session's paused work automatically; no further client action is needed.
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managed-agents/agent-setup
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managed-agents/agent-setup
| `multiagent` | A coordinator declaration listing the agents this agent can delegate to. See [Multiagent orchestration](https://platform.claude.com/docs/en/managed-agents/multiag
| `multiagent` | Lets the agent hand work to other agents, as subagents or in [dynamic workflows](https://platform.claude.com/docs/en/managed-agents/multiagent-orchestration#dynam
Setting `inference_geo` on a model that doesn't support geographic inference pinning returns a 400 error; see [Model availability](https://platform.claude.com/docs/en/manage-claude
Setting `inference_geo` on a model that doesn't support geographic inference pinning returns a 400 error; see [Model availability](https://platform.claude.com/docs/en/manage-claude
* **`multiagent`** is replaced as a whole, including its `agents` roster. Pass `null` to clear it.
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api
get-started
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get-started
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
<version>2.70.0</version>
<version>2.71.0</version>
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cli-sdks-libraries/sdks/java
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cli-sdks-libraries/sdks/java
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
<version>2.70.0</version>
<version>2.71.0</version>
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cli-sdks-libraries/cli/sessions-connect
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cli-sdks-libraries/cli/sessions-connect
The terminal view shows the conversation live: messages and tool calls, with each call's duration and outcome. A status bar shows whether the session is running, idle, or waiting f
The terminal view shows the conversation live: messages and tool calls, with each call's duration and outcome. A status bar shows whether the session is running, idle, or waiting f
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cli-sdks-libraries/cli/quickstart
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cli-sdks-libraries/cli/quickstart
VERSION=1.39.1
VERSION=1.40.0
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build-with-claude/claude-platform-on-aws
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build-with-claude/claude-platform-on-aws
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java-aws:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
implementation("com.anthropic:anthropic-java-aws:2.71.0")
<version>2.70.0</version>
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build-with-claude/claude-on-vertex-ai
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build-with-claude/claude-on-vertex-ai
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java-vertex:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
implementation("com.anthropic:anthropic-java-vertex:2.71.0")
<version>2.70.0</version>
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build-with-claude/claude-on-amazon-bedrock-legacy
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build-with-claude/claude-on-amazon-bedrock-legacy
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java-bedrock:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
implementation("com.anthropic:anthropic-java-bedrock:2.71.0")
<version>2.70.0</version>
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build-with-claude/claude-in-microsoft-foundry
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build-with-claude/claude-in-microsoft-foundry
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java-foundry:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
implementation("com.anthropic:anthropic-java-foundry:2.71.0")
<version>2.70.0</version>
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build-with-claude/claude-in-amazon-bedrock
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build-with-claude/claude-in-amazon-bedrock
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java-bedrock:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
implementation("com.anthropic:anthropic-java-bedrock:2.71.0")
<version>2.70.0</version>
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agents-and-tools/tool-use/advisor-tool
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agents-and-tools/tool-use/advisor-tool
[Claude Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview) sessions support an advisor as well, configured as part of the agent rather than as a tool defi
[Claude Managed Agents](https://platform.claude.com/docs/en/managed-agents/overview) sessions support an advisor as well, configured as part of the agent rather than as a tool defi
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agents-and-tools/mcp-connector
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agents-and-tools/mcp-connector
implementation("com.anthropic:anthropic-java:2.70.0")
implementation("com.anthropic:anthropic-java-mcp:2.70.0")
implementation("com.anthropic:anthropic-java:2.71.0")
implementation("com.anthropic:anthropic-java-mcp:2.71.0")
<version>2.70.0</version>
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api
about-claude/models/optimizing-for-cost-and-intelligence
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about-claude/models/optimizing-for-cost-and-intelligence
On Claude Managed Agents, you can append the sentence to the task in the `user.message` event that starts the session, and the clock to each `user.message` and [`user.custom_tool_r
On Claude Managed Agents, you can append the sentence to the task in the `user.message` event that starts the session, and the clock to each `user.message` and [`user.custom_tool_r
To use it, add the [advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool) to your request. This beta feature runs the whole strategy server-side
To use it, add the [advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool) to your request. This beta feature runs the whole strategy server-side
To build one, use [multiagent orchestration](https://platform.claude.com/docs/en/managed-agents/multiagent-orchestration) in Claude Managed Agents: configure a coordinator agent (t
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test-and-evaluate/strengthen-guardrails/reduce-latency
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test-and-evaluate/strengthen-guardrails/reduce-latency
* **Experiment with temperature:** The `temperature` [parameter](https://platform.claude.com/docs/en/api/messages/create) controls the randomness of the output. Lower values (for e
* **Experiment with temperature:** The `temperature` [parameter](https://platform.claude.com/docs/en/api/messages/create) controls the randomness of the output. Lower values (for e
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test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
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test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
* **Fall back to another model:** Configure [server-side fallback or the SDK middleware](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) so refused req
* **Redeem fallback credit on manual retries:** If you build the retry yourself, pass the refusal's [fallback credit](https://platform.claude.com/docs/en/build-with-claude/fallback
* **Fall back to another model:** Configure [server-side fallback or the SDK middleware](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) so refused req
* **Redeem fallback credit on manual retries:** If you build the retry yourself, pass the refusal's [fallback credit](https://platform.claude.com/docs/en/build-with-claude/fallback
* **Retry on a different model.** Re-sending a refused request to the same model usually results in another refusal. Instead of only resetting context, retry on a fallback model wi
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resources/overview
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resources/overview
</Card>
<Card title="Claude Sonnet 5.5 System Card" icon="file" href="https://www.anthropic.com/document/claude-sonnet-5-5-system-card">
Detailed documentation of Claude Sonnet 5.5.
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release-notes/overview
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release-notes/overview
* Code written for Claude Haiku 4.5 can break on Claude Haiku 5.5. Manual extended thinking (`budget_tokens`) returns a 400 error, and adaptive thinking is on by default, so a resp
* Code written for Claude Haiku 4.5 can break on Claude Haiku 5.5. Manual extended thinking (`budget_tokens`), the sampling parameters `temperature`, `top_p`, and `top_k`, and assi
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models/sonnet-5-5/whats-new-sonnet-5-5
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models/sonnet-5-5/whats-new-sonnet-5-5
* [The advisor tool rejects Claude Opus 4.8, Claude Opus 4.7, and Claude Sonnet 5 as advisors](https://platform.claude.com/docs/en/models/sonnet-5-5/whats-new-sonnet-5-5#advisor-to
* [The advisor tool rejects Claude Opus 4.8, Claude Opus 4.7, Claude Sonnet 5, and Claude Haiku 5.5 as advisors](https://platform.claude.com/docs/en/models/sonnet-5-5/whats-new-son
Every thinking block records which model produced it. Each model reads its own blocks and only some other models' blocks. Claude Sonnet 5.5 reads thinking blocks from Claude Sonnet
Every thinking block records which model produced it. Each model reads its own blocks and only some other models' blocks. Claude Sonnet 5.5 reads thinking blocks from Claude Sonnet
With the [advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool) (beta), a Claude Sonnet 5.5 executor needs Claude Mythos 5.1, Claude Fable 5.1,
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models/sonnet-5-5/overview
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models/sonnet-5-5/overview
* [The advisor tool rejects Claude Opus 4.8, Claude Opus 4.7, and Claude Sonnet 5 as advisors](https://platform.claude.com/docs/en/models/sonnet-5-5/whats-new-sonnet-5-5#advisor-to
* [The advisor tool rejects Claude Opus 4.8, Claude Opus 4.7, Claude Sonnet 5, and Claude Haiku 5.5 as advisors](https://platform.claude.com/docs/en/models/sonnet-5-5/whats-new-son
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models/sonnet-5-5/migration-guide
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models/sonnet-5-5/migration-guide
Claude Sonnet 5.5 reads thinking blocks from Claude Sonnet 5, Claude Opus 4.8, Claude Haiku 4.5, and earlier models. It doesn't read blocks from Claude Opus 5, Claude Opus 5.5, or
Claude Sonnet 5.5 reads thinking blocks from Claude Sonnet 5, Claude Opus 4.8, Claude Haiku 4.5, and earlier models, and, on the Claude API and Google Cloud, from Claude Haiku 5.5.
With the [advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool), a Claude Sonnet 5.5 executor needs one of these advisors: Claude Opus 5, Claude
With the [advisor tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool), a Claude Sonnet 5.5 executor needs one of these advisors: Claude Opus 5, Claude
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api
models/overview
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models/overview
* **Retirement:** Anthropic’s commitment for Anthropic-operated platforms (Claude API, Claude Platform on AWS, Microsoft Foundry). Amazon Bedrock and Google Cloud set their own dat
* **Retirement:** Anthropic’s commitment for the platforms that Anthropic operates. Amazon Bedrock and Google Cloud set their own dates.
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models/opus-5-5/whats-new-opus-5-5
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models/opus-5-5/whats-new-opus-5-5
Every thinking block records which model produced it, and each model reads its own blocks and only some other models'. Claude Opus 5.5 reads thinking blocks from Claude Opus 5, fro
Every thinking block records which model produced it, and each model reads its own blocks and only some other models'. Claude Opus 5.5 reads thinking blocks from Claude Opus 5, fro
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models/opus-5-5/migration-guide
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models/opus-5-5/migration-guide
* If a router or fallback can move a conversation from Claude Opus 5.5 to another model, expect that model to run without Claude Opus 5.5's thinking blocks (Claude Fable 5.1 and Cl
* If a router or fallback can move a conversation from Claude Opus 5.5 to another model, expect that model to run without Claude Opus 5.5's thinking blocks (Claude Fable 5.1 and Cl
On the Claude API, Claude Fable 5.1 and Claude Mythos 5.1 read Claude Opus 5.5 thinking blocks; no other model does. A router or fallback that moves a conversation from Claude Opus
On the Claude API, Claude Fable 5.1 and Claude Mythos 5.1 read Claude Opus 5.5 thinking blocks; no other model does. A router or fallback that moves a conversation from Claude Opus
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models/haiku-5-5/whats-new-haiku-5-5
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models/haiku-5-5/whats-new-haiku-5-5
| Change | Type | Actio
| --------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------- | -----
| [Adaptive thinking and effort](https://platform.claude.com/docs/en/models/haiku-5-5/whats-new-haiku-5-5#adaptive-thinking-and-effort) | New | Optio
| [Larger context window and output](https://platform.claude.com/docs/en/models/haiku-5-5/whats-new-haiku-5-5#larger-context-window-and-output) | New | None.
| [Browser use tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/browser-use-tool) | New | None.
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models/haiku-5-5/overview
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models/haiku-5-5/overview
* Omit `temperature`, `top_p`, and `top_k`, since a non-default value for any of them returns a 400 error.
* Omit `temperature`, `top_p`, and `top_k`. See [Remove sampling parameters](https://platform.claude.com/docs/en/models/haiku-5-5/migration-guide#remove-sampling-parameters) for th
* The minimum cacheable prompt length is 512 tokens. See [Prompt caching](https://platform.claude.com/docs/en/build-with-claude/prompt-caching#cache-limitations).
1M tokens. How the window is counted and managed.
How the context window is counted and managed.
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models/haiku-5-5/migration-guide
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models/haiku-5-5/migration-guide
description: Switch to Claude Haiku 5.5 from earlier Haiku models with this migration guide. The guidance to enable Claude Haiku 5.5 includes the new model ID, each breaking change
description: Switch to Claude Haiku 5.5 from earlier Haiku models with this migration guide. The guidance to enable Claude Haiku 5.5 includes the new model ID, settings that return
2. Recount your prompts, and revisit `max_tokens` limits and cost estimates, because the same text counts as more tokens. See [Recount tokens](https://platform.claude.com/docs/en/m
2. Recount your prompts, and revisit `max_tokens` limits and cost estimates, because the same text counts as more tokens and large images count as more visual tokens. See [Recount
7. If you use computer use on the Claude API or Google Cloud, move from `computer_20250124` to the `computer_toolset_20260801` toolset. See [Move computer use to the toolset](https
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models/haiku-4-5/overview
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models/haiku-4-5/overview
<Card title="Choosing a model" icon="scales" href="https://platform.claude.com/docs/en/about-claude/models/choosing-a-model">
When to start efficiency-first with Haiku and when to reach for a larger model.
</Card>
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models/fable-5/migration-guide
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models/fable-5/migration-guide
* If you replay conversation history on an earlier model, strip `thinking` and `redacted_thinking` blocks from prior assistant turns first. Thinking blocks from `claude-fable-5` an
* When you switch models, keep passing thinking blocks back unchanged. Thinking blocks from `claude-fable-5` and `claude-mythos-5` are readable only by those two models and by Clau
* If you replay conversation history on an earlier model, strip `thinking` and `redacted_thinking` blocks from prior assistant turns first. Thinking blocks from `claude-fable-5` an
* When you switch models, keep passing thinking blocks back unchanged. Thinking blocks from `claude-fable-5` and `claude-mythos-5` are readable only by those two models and by Clau
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models/fable-5-1/whats-new-fable-5-1
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models/fable-5-1/whats-new-fable-5-1
If you already call Claude Fable 5, three changes are breaking: [forced tool use returns an error](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1#forced-t
If you already call Claude Fable 5, three changes are breaking: [forced tool use returns an error](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1#forced-t
### Earlier models can't read Claude Fable 5.1 thinking blocks
Every thinking block records which model produced it, and it's preserved in one direction only: Claude Fable 5.1 reads earlier models' thinking blocks, and no earlier model reads C
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models/fable-5-1/overview
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models/fable-5-1/overview
If you already call Claude Fable 5, three changes are breaking: [forced tool use returns an error](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1#forced-t
If you already call Claude Fable 5, three changes are breaking: [forced tool use returns an error](https://platform.claude.com/docs/en/models/fable-5-1/whats-new-fable-5-1#forced-t
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models/fable-5-1/migration-guide
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models/fable-5-1/migration-guide
Migration is mostly drop-in. The API surface, limits, per-token pricing, tokenizer, always-on adaptive thinking, refusal handling, and `stop_details` categories all match Claude Fa
Migration is mostly drop-in. The API surface, limits, per-token pricing, tokenizer, always-on adaptive thinking, refusal handling, and `stop_details` categories all match Claude Fa
2. **Thinking blocks are preserved only for the model that produced them, or a newer one:** Every `thinking` block records which model produced it. Claude Fable 5.1 reads its own b
A conversation that ran on Claude Fable 5.1 can land on an older model through a router switch, a client-side retry, or a [classifier refusal fallback](https://platform.claude.c
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managed-agents/sessions
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managed-agents/sessions
"model": {"id": "claude-sonnet-5"},
"model": {"id": "claude-sonnet-5-5"},
id: claude-sonnet-5
id: claude-sonnet-5-5
"model": {"id": "claude-sonnet-5"},
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managed-agents/multiagent-orchestration
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managed-agents/multiagent-orchestration
model: claude-haiku-4-5
model: claude-haiku-5-5
model: claude-haiku-4-5
model: claude-haiku-5-5
"model": "claude-haiku-4-5",
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managed-agents/events-and-streaming
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managed-agents/events-and-streaming
3. For each blocking event ID, send a [`user.custom_tool_result`](https://platform.claude.com/docs/en/managed-agents/events-and-streaming#return-a-custom-tool-result) or a [`user.t
3. For each blocking event ID, send a [`user.custom_tool_result`](https://platform.claude.com/docs/en/managed-agents/events-and-streaming#return-a-custom-tool-result) or a [`user.t
You can send the result as soon as the `agent.custom_tool_use` event arrives, without waiting for `session.status_idle`. The session still emits `session.status_idle` with a `requi
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manage-claude/rate-limits-api
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manage-claude/rate-limits-api
* **`source` on workspace limits:** On the workspace endpoint, every limit value also carries `source`, which says where `value` comes from: `{"type": "workspace"}` for an override
```json
```text wrap
The `/v1/organizations/workspaces/{workspace_id}/rate_limits` endpoint returns the rate limit overrides configured for a single workspace.
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manage-claude/data-residency
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manage-claude/data-residency
* **Claude 4.6 and later models:** US-only inference (`inference_geo: "us"`) is priced at 1.1x the standard rate across all token pricing categories (input tokens, output tokens, c
* **Claude 4.6 and later models:** US-only inference (`inference_geo: "us"`) is priced at 1.1x the standard rate across all token pricing categories (input tokens, output tokens, c
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intro
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intro
Discover what Claude can do: extended thinking, web search, file handling, structured outputs, and more.
Discover what Claude can do: thinking, web search, file handling, structured outputs, and more.
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cli-sdks-libraries/sdks/java
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cli-sdks-libraries/sdks/java
Avoid setting a large `maxTokens` value without using streaming. Some networks may drop idle connections after a certain period of time, which can cause the request to fail or [tim
Avoid setting a large `maxTokens` value without using streaming. Some networks may drop idle connections after a certain period of time, which can cause the request to fail or [tim
* **Agent Platform:** `com.anthropic:anthropic-java-vertex`: Use `VertexBackend.fromEnv()` or `VertexBackend.builder()`.
* **Agent Platform:** `com.anthropic:anthropic-java-vertex`: Use `VertexBackend.builder()` or `VertexBackend.fromEnv()`. `fromEnv()` reads `CLOUD_ML_REGION` and `ANTHROPIC_VERTEX_P
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cli-sdks-libraries/middleware
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cli-sdks-libraries/middleware
The SDK ships a refusal-fallback middleware that automatically retries requests Claude Fable 5 declines on a fallback model. See [Detect and retry on a fallback model](https://plat
The SDK ships a refusal-fallback middleware that automatically retries a request Claude declines (`stop_reason: "refusal"`) on a fallback model. [Refusals and fallback](https://pla
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cli-sdks-libraries/libraries/openai-sdk
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cli-sdks-libraries/libraries/openai-sdk
* System/developer messages are hoisted and concatenated to the beginning of the conversation, as Anthropic only supports a single initial system message.
* System/developer messages are hoisted and concatenated into the top-level `system` field, wherever they appear in the conversation. To add system instructions partway through a c
Most of the inputs to the OpenAI SDK clearly map directly to Anthropic’s API parameters, but one distinct difference is the handling of system / developer prompts. These two prompt
Most of the inputs to the OpenAI SDK clearly map directly to Anthropic’s API parameters, but one distinct difference is the handling of system / developer prompts. These two prompt
| Field | Support status
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cli-sdks-libraries/libraries/apple-foundation-models
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cli-sdks-libraries/libraries/apple-foundation-models
Pin a Claude [effort level](https://platform.claude.com/docs/en/build-with-claude/effort) for every request with `fixedEffort:`. It takes precedence over the framework's per-reques
Pin a Claude [effort level](https://platform.claude.com/docs/en/build-with-claude/effort) for every request with `fixedEffort:`. It takes precedence over the framework's per-reques
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claude_api_primer
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claude_api_primer
Thinking can sometimes help Claude with very hard tasks. The current mechanism is [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) (`thinking: {"
Thinking can sometimes help Claude with very hard tasks. The current mechanism is [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) (`thinking: {"
* Claude Sonnet 5.5 (`claude-sonnet-5-5`, adaptive thinking only, on by default)
* Claude Sonnet 5.5 (`claude-sonnet-5-5`, adaptive thinking only, on by default; `thinking: {"type": "disabled"}` returns a 400 error, so send `thinking: {"type": "between_tools"}`
1. **Tool choice limitation:** Only supports `tool_choice: {"type": "auto"}` (default) or `tool_choice: {"type": "none"}`.
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build-with-claude/working-with-messages
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build-with-claude/working-with-messages
On Claude Fable 5.1, [Claude Mythos 5.1](https://platform.claude.com/docs/en/models/mythos-5-1/overview), Claude Fable 5, [Claude Mythos 5](https://platform.claude.com/docs/en/mode
On Claude Fable 5.1, [Claude Mythos 5.1](https://platform.claude.com/docs/en/models/mythos-5-1/overview), Claude Fable 5, [Claude Mythos 5](https://platform.claude.com/docs/en/mode
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build-with-claude/thinking-troubleshooting
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build-with-claude/thinking-troubleshooting
Claude Haiku 5.5 returns the same message for a per-message effort change while `thinking: {type: "disabled"}` is set.
To fix it, keep the history append-only: pass earlier turns back exactly as sent and received, add instructions with a [mid-conversation system message](https://platform.claude.com
To fix it, keep the history append-only: pass earlier turns back exactly as sent and received, add instructions with a [mid-conversation system message](https://platform.claude.com
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build-with-claude/thinking-tool-workflows
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build-with-claude/thinking-tool-workflows
* [Limit tool choice to `auto` or `none` in manual mode](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-with-tool-use): `tool_choice` options that force to
* [Limit tool choice to `auto` or `none` in manual mode](https://platform.claude.com/docs/en/build-with-claude/thinking#thinking-with-tool-use): `tool_choice` options that force to
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build-with-claude/thinking-steering-and-cost
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build-with-claude/thinking-steering-and-cost
<Note>
To get less thinking on Claude Sonnet 5.5 and Claude Haiku 5.5, lower the effort level. Asking Claude Sonnet 5.5 in the system prompt to think less doesn't reliably reduce its th
</Note>
You can also steer thinking on a per-message basis from the user turn, independently of the system prompt. Appending `"Please think hard before responding."` to a user message enco
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build-with-claude/thinking
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build-with-claude/thinking
Claude Haiku 5.5 also has thinking on by default and accepts `thinking: {type: "disabled"}` at [effort](https://platform.claude.com/docs/en/build-with-claude/effort) `high` or belo
Claude Haiku 5.5 also has thinking on by default and accepts `thinking: {type: "disabled"}` at [effort](https://platform.claude.com/docs/en/build-with-claude/effort) `high` or belo
* `display` is invalid with `thinking.type: "disabled"` (there is nothing to display).
* `display` is invalid with `thinking.type: "disabled"` (there is nothing to display) and with `thinking.type: "between_tools"` (Claude Sonnet 5.5 only), which accepts no other fie
1. **Tool choice limitation (manual mode):** tool use with manual extended thinking (`thinking: {type: "enabled"}`) only supports `tool_choice: {"type": "auto"}` (the default) or `
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build-with-claude/streaming
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build-with-claude/streaming
description: Stream Messages API responses incrementally with server-sent events, including text, tool use, and extended thinking deltas.
description: Stream Messages API responses incrementally with server-sent events, including text, tool use, and thinking deltas.
2. **Handle content types:** Be aware that messages can contain multiple content blocks (`text`, `tool_use`, `thinking`). Tool use and extended thinking blocks cannot be partially
2. **Handle content types:** Be aware that messages can contain multiple content blocks (`text`, `tool_use`, `thinking`). Tool use and thinking blocks cannot be partially recovered
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build-with-claude/refusals-and-fallback
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build-with-claude/refusals-and-fallback
The simplest setup, in beta on the Claude API: set `fallbacks` to `"default"`, and the API retries a declined request on the fallback model Anthropic recommends for its refusal cat
The simplest setup, in beta on the Claude API: set `fallbacks` to `"default"`, and the API retries a declined request on the fallback model Anthropic recommends for its refusal cat
**Fallback:** When you use fallback, the refusal that triggered it is billed, in addition to the fallback request, when it arrived mid-stream or is in one of the billed categories.
**Fallback:** When you use fallback, the refusal that triggered it is billed, in addition to the fallback request, when it arrived mid-stream or is in one of the billed categories.
Server-side fallback and the SDK middleware apply fallback credit for you. You only need the [Fallback credit](https://platform.claude.com/docs/en/build-with-claude/fallback-credit
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build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5
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build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5
Changing the top-level `effort` value between requests invalidates the prompt cache. To run individual turns at a different level, use a [per-message effort change](https://platfor
Changing the top-level `effort` value between requests invalidates the prompt cache. To change the level partway through a conversation, use a [per-message effort change](https://p
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build-with-claude/prompt-engineering/prompting-claude-opus-5-5
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build-with-claude/prompt-engineering/prompting-claude-opus-5-5
Changing the top-level `effort` value between requests invalidates the prompt cache. To run individual turns at a different level, use a [per-message effort change](https://platfor
Changing the top-level `effort` value between requests invalidates the prompt cache. To change the level partway through a conversation, use a [per-message effort change](https://p
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build-with-claude/prompt-engineering/prompting-claude-haiku-5-5
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build-with-claude/prompt-engineering/prompting-claude-haiku-5-5
For the five breaking API changes when migrating from Claude Haiku 4.5, see the [migration guide](https://platform.claude.com/docs/en/models/haiku-5-5/migration-guide).
For the breaking API changes when migrating from Claude Haiku 4.5, see the [migration guide](https://platform.claude.com/docs/en/models/haiku-5-5/migration-guide).
Several sections on this page suggest text to add to your system prompt. Add it to new conversations only. A request that sends thinking blocks back after `system` changed can re
* `medium` is the default on the Claude API and in Claude Code. Start here for most work, including agentic coding.
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build-with-claude/prompt-engineering/claude-prompting-best-practices
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build-with-claude/prompt-engineering/claude-prompting-best-practices
If you are not using extended thinking, no changes are required. On Claude Opus 4.6 through Claude Opus 4.8 and Claude Sonnet 4.6, thinking is off when you omit the `thinking` para
If you are not using extended thinking, you don't need to add a `thinking` parameter. On Claude Opus 4.6 through Claude Opus 4.8 and Claude Sonnet 4.6, thinking is off when you omi
4. **Update thinking configuration:** Claude 4.6 models use [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) (`thinking: {type: "adaptive"}`) ins
4. **Update thinking configuration:** Claude 4.6 and later models use [adaptive thinking](https://platform.claude.com/docs/en/build-with-claude/thinking) (`thinking: {type: "adapti
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build-with-claude/prompt-caching
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build-with-claude/prompt-caching
These multipliers stack with other pricing modifiers such as the Batch API discount and data residency. See [pricing](https://platform.claude.com/docs/en/about-claude/pricing) fo
These multipliers stack with other pricing modifiers such as the Batch API discount, [long context pricing](https://platform.claude.com/docs/en/about-claude/pricing#long-context-
| What changes | Tools cache | System cache | Messages cache | Impact
| --------------------------------------------------------- | -------------- | -------------- | -------------- | -------------------------------------------------------------------
| **Tool definitions** | ✘ | ✘ | ✘ | Modifying tool definitions (names, descriptions, parameters) invali
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build-with-claude/preserved-thinking
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build-with-claude/preserved-thinking
Claude Fable 5.1 and Claude Mythos 5.1 read thinking blocks produced by each other and by earlier Claude models. No earlier model reads thinking blocks from Claude Fable 5.1 or Cla
Claude Fable 5.1 and Claude Mythos 5.1 read thinking blocks produced by each other and by earlier Claude models. No other model reads thinking blocks from Claude Fable 5.1 or Claud
Claude Haiku 5.5 reads thinking blocks from Claude Sonnet 5, Claude Opus 4.8, Claude Haiku 4.5, and earlier models, but not from Claude Opus 5, Claude Opus 5.5, Claude Sonnet 5.5,
* **A conversation that moves down to an earlier model loses Claude Fable 5.1's reasoning for that request.** This occurs when a router sends a turn to a cheaper model, after a [cl
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build-with-claude/mid-conversation-system-messages
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build-with-claude/mid-conversation-system-messages
* **User input that should not interrupt an agentic loop.** A user types a follow-up while Claude is still executing tools for the previous request. Relaying it as a system message
* **User input that should not interrupt an agentic loop.** A user types a follow-up while Claude is still executing tools for the previous request. Relaying it as a system message
A mid-conversation system message must immediately follow a `user` turn (or an `assistant` turn ending in a server tool result), and must either be the last entry in `messages` or
A mid-conversation system message that carries content (`text`, `tool_addition`, or `tool_removal` blocks) must immediately follow a `user` turn (or an `assistant` turn ending in a
In an [agentic loop](https://platform.claude.com/docs/en/agents-and-tools/tool-use/overview), the system message goes after the `user` message that delivers the tool results. This
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build-with-claude/mid-conversation-effort-example
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build-with-claude/mid-conversation-effort-example
import { rmSync } from "node:fs";
import { mkdtemp, readFile, rename, writeFile } from "node:fs/promises";
import { mkdtempDisposable, readFile, rename, writeFile } from "node:fs/promises";
import { promisify } from "node:util";
// The other ports stream with max_tokens 64000. This port uses non-streaming
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build-with-claude/handling-stop-reasons
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build-with-claude/handling-stop-reasons
A refused request on Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, or Claude Haiku 5.5 can usually be served by retrying on another Claude mo
A refused request on Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, or Claude Haiku 5.5 can usually be served by retrying on another Claude mo
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build-with-claude/files
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build-with-claude/files
Amazon Bedrock: not available
Google Cloud: not available
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build-with-claude/fallback-credit
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build-with-claude/fallback-credit
Fallback credit is in beta on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry. Refusals in [Message Batches](https://platform.claude.com
The retry model must be one of the refused model's permitted fallback targets. For Claude Fable 5.1 and Claude Fable 5, those are Claude Opus 4.8 (`claude-opus-4-8`) and Claude Opu
Fallback credit is in beta on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry. Refusals in [Message Batches](https://platform.claude.com
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build-with-claude/extended-thinking
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build-with-claude/extended-thinking
`effort: "high"` matches the API default; it appears here only to show where the depth control now lives, and omitting it produces identical behavior.
`effort: "high"` is the default on Claude Sonnet 4.6, so omitting it here produces identical behavior; it appears only to show where the depth control lives in adaptive mode. Claud
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build-with-claude/effort
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build-with-claude/effort
Claude Haiku 5.5 supports all five effort levels, and `medium` is the default on the Claude API and in Claude Code. Effort is the main control for how much the model thinks, and wi
Claude Haiku 5.5 supports all five effort levels, and `medium` is the default. Effort is the main control for how much the model thinks, and with it quality, latency, and cost. **S
Add a `role: "system"` message with empty `content` and the new level in `output_config.effort`. The new level takes effect from the next `user` turn and holds until a later messag
Add a `role: "system"` message with empty `content` and the new level in `output_config.effort`. Placed directly after a `user` turn with new input, it sets the level for Claude's
On Claude Fable 5.1, prefer this form over changing the top-level value between requests. A top-level change restarts the cache and also steers the model less reliably: its earlier
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build-with-claude/context-windows
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build-with-claude/context-windows
* **Thinking block clearing:** Manage thinking blocks when you use extended thinking
* **Thinking block clearing:** Manage thinking blocks from earlier turns
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build-with-claude/context-editing
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build-with-claude/context-editing
* **Thinking block clearing** - For managing thinking blocks when using extended thinking, with options to preserve recent thinking for context continuity
* **Thinking block clearing** - For managing thinking blocks from earlier turns, with options to preserve recent thinking for context continuity
The `clear_thinking_20251015` strategy manages `thinking` blocks in conversations when extended thinking is enabled. This strategy gives you control over thinking preservation: you
The `clear_thinking_20251015` strategy manages `thinking` blocks from earlier assistant turns. This strategy gives you control over thinking preservation: you can choose to keep mo
Enable thinking block clearing to manage context and prompt caching effectively when extended thinking is enabled:
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build-with-claude/compaction-threshold
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build-with-claude/compaction-threshold
Here's an example that uses `pause_after_compaction` to preserve the prior exchange and the current user message (three messages total) verbatim instead of summarizing them:
Here's an example that uses `pause_after_compaction` to preserve the prior exchange and the current user message (three messages total) instead of summarizing them. It keeps their
# by including them after the compaction block
preserved_messages = messages[-3:] if len(messages) >= 3 else messages
# by including them after the compaction block, without thinking
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build-with-claude/compaction-thinking-blocks
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build-with-claude/compaction-thinking-blocks
Amazon Bedrock: not available
Mid-conversation system messages inside the summarized turns are summarized too, so their text instructions stop applying after the swap. To keep one in force, state it again in a
Mid-conversation system messages inside the summarized turns are summarized too, so their text instructions stop applying after the swap. A [per-message effort](https://platform.cl
In production, `"drop_block"` keeps requests succeeding when a condition doesn't hold, and reports each dropped block in `input_transformations` with `reason: "prefix_binding_misma
In production, `"drop_block"` keeps requests succeeding when a condition doesn't hold, and reports each dropped block in `input_transformations` with `reason: "prefix_binding_misma
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build-with-claude/compaction-on-demand
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build-with-claude/compaction-on-demand
Amazon Bedrock: not available
* **Mid-conversation system messages and tool changes.** `role: "system"` messages inside the summarized range are summarized too, so their text instructions stop applying once the
* **Mid-conversation system messages and tool changes.** `role: "system"` messages inside the summarized range are summarized too, so their text instructions stop applying once the
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build-with-claude/compaction-keep-recent-turns
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build-with-claude/compaction-keep-recent-turns
Amazon Bedrock: not available
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build-with-claude/compaction-background
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build-with-claude/compaction-background
Amazon Bedrock: not available
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build-with-claude/claude-platform-on-aws
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build-with-claude/claude-platform-on-aws
"model": "claude-sonnet-5",
"model": "claude-sonnet-5-5",
--model claude-sonnet-5 \
--model claude-sonnet-5-5 \
model="claude-sonnet-5",
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build-with-claude/claude-on-vertex-ai
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build-with-claude/claude-on-vertex-ai
void main() {
import com.google.auth.oauth2.GoogleCredentials;
void main() throws Exception {
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build-with-claude/claude-in-microsoft-foundry
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build-with-claude/claude-in-microsoft-foundry
* [Computer use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool) and [browser use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/br
* [Computer use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool) and [browser use](https://platform.claude.com/docs/en/agents-and-tools/tool-use/br
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build-with-claude/claude-in-amazon-bedrock
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build-with-claude/claude-in-amazon-bedrock
Use Claude Code 2.1.255 or later with Claude Fable 5.1 on Amazon Bedrock, and 2.1.280 or later with Claude Opus 5.5; run `claude update` to upgrade.
Use Claude Code 2.1.255 or later with Claude Fable 5.1 on Amazon Bedrock, and 2.1.280 or later with Claude Opus 5.5 and Claude Haiku 5.5; run `claude update` to upgrade.
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build-with-claude/cache-diagnostics
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build-with-claude/cache-diagnostics
Claude Platform on AWS: not available
Amazon Bedrock: not available
Google Cloud: not available
Microsoft Foundry: not available
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api/skills/versions/retrieve
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api/skills/versions/retrieve
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills/versions/list
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api/skills/versions/list
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills/versions/delete
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api/skills/versions/delete
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills/versions/create
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api/skills/versions/create
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills/versions
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api/skills/versions
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills/retrieve
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api/skills/retrieve
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills/list
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api/skills/list
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills/delete
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api/skills/delete
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills/create
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api/skills/create
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/skills
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api/skills
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/organization/workspaces/update
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api/organization/workspaces/update
## Headers
- `"anthropic-version": optional string`
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api
api/organization/workspaces/service_accounts/update
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api/organization/workspaces/service_accounts/update
## Headers
- `"anthropic-version": optional string`
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api
api/organization/workspaces/service_accounts/retrieve
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api/organization/workspaces/service_accounts/retrieve
## Headers
- `"anthropic-version": optional string`
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api
api/organization/workspaces/service_accounts/remove
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api/organization/workspaces/service_accounts/remove
## Headers
- `"anthropic-version": optional string`
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api
api/organization/workspaces/service_accounts/list
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api/organization/workspaces/service_accounts/list
## Headers
- `"anthropic-version": optional string`
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api
api/organization/workspaces/service_accounts/add
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api/organization/workspaces/service_accounts/add
## Headers
- `"anthropic-version": optional string`
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api
api/organization/workspaces/service_accounts
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api/organization/workspaces/service_accounts
### Headers
- `"anthropic-version": optional string`
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api
api/organization/workspaces/retrieve
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api/organization/workspaces/retrieve
## Headers
- `"anthropic-version": optional string`
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Recorded here 9 Oct 2026 15:37 UTC
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