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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
10,166 of the ledger's changes in api. Show every change
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28 Sep 2026
74 pages
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api
build-with-claude/task-budgets
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build-with-claude/task-budgets
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| Claude Sonnet 5.5 | Beta (set `task-budgets-2026-03-13` header) |
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build-with-claude/structured-outputs
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build-with-claude/structured-outputs
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build-with-claude/refusals-and-fallback
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build-with-claude/refusals-and-fallback
description: How Claude Fable and Claude Opus models return classifier refusals and how to retry refused requests on a fallback model.
description: How Claude Fable models, Claude Opus models, and Claude Sonnet 5.5 return classifier refusals and how to retry refused requests on a fallback model.
Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, and Claude Opus 5 include safety classifiers that can decline a request. When that happens, you receive a normal response, not an
Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, and Claude Sonnet 5.5 include safety classifiers that can decline a request. When that happens, you receive a norm
* The request must be valid as a direct request to every model named. If a fallback model does not support a feature the request uses, the API rejects the request up front.
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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
This is the reference for prompt engineering with current Claude models, including Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, Claude Opus 5.5, Claude Opu
This is the reference for prompt engineering with current Claude models, including Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, Claude Opus 5.5, Claude Opu
For an overview of model capabilities, see the [models overview](https://platform.claude.com/docs/en/models/overview). For Claude Fable 5.1 capabilities and API changes, see [Wha
For an overview of model capabilities, see the [models overview](https://platform.claude.com/docs/en/models/overview). For Claude Fable 5.1 capabilities and API changes, see [Wha
| Model | Guide | What'
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build-with-claude/prompt-caching
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build-with-claude/prompt-caching
| Claude Sonnet 5.5 | $2 / MTok | $2.50 / MTok | $4 /
* 512 tokens for Claude Fable 5.1, Claude Mythos 5.1, Claude Opus 5.5, Claude Opus 5, Claude Fable 5, and [Claude Mythos 5](https://anthropic.com/glasswing)
* 512 tokens for Claude Fable 5.1, Claude Mythos 5.1, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Fable 5, and [Claude Mythos 5](https://anthropic.com/glasswing)
| **Dropped thinking blocks** | ✓ | ✓ | ✘ | When the API drops a Claude Fable 5.1, Claude Mythos 5.1, or Claude
| **Dropped thinking blocks** | ✓ | ✓ | ✘ | When the API drops a Claude Fable 5.1, Claude Mythos 5.1, Claude Op
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build-with-claude/preserved-thinking
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build-with-claude/preserved-thinking
Claude Sonnet 5.5's thinking blocks are also tied to the account that produced them. See [Thinking blocks stay with the account that produced them](https://platform.claude.com/docs
Also check your integration if it sends Claude Sonnet 5.5 thinking blocks from one account in a request made by a different account. See [Thinking blocks stay with the account that
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build-with-claude/mid-conversation-system-messages
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build-with-claude/mid-conversation-system-messages
This feature is available on Claude Fable 5.1, [Claude Mythos 5.1](https://anthropic.com/glasswing), Claude Fable 5, [Claude Mythos 5](https://anthropic.com/glasswing), Claude Op
This feature is available on Claude Fable 5.1, [Claude Mythos 5.1](https://anthropic.com/glasswing), Claude Fable 5, [Claude Mythos 5](https://anthropic.com/glasswing), Claude Op
A `role: "system"` message can also carry `output_config.effort` to change the [effort](https://platform.claude.com/docs/en/build-with-claude/effort) level from the next `user` tur
A `role: "system"` message can also carry `output_config.effort` to change the [effort](https://platform.claude.com/docs/en/build-with-claude/effort) level from the next `user` tur
The main use is a per-turn reminder in a tool loop. Append the reminder after the `tool_result` message each time you want the model to see it, and leave every earlier copy where i
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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, or Claude Opus 5 can usually be served by retrying on another Claude model. [Refusals and fallback](https://
A refused request on Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, or Claude Sonnet 5.5 can usually be served by retrying on another Claude model. [Refusals and
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build-with-claude/fallback-credit
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build-with-claude/fallback-credit
On models that include the 1M token context window by default, such as Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, and Claude Opus 4.8, the `context-1m-20
On models that include the 1M token context window by default, such as Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Sonnet 5.5, and
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build-with-claude/extended-thinking
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build-with-claude/extended-thinking
* You use Claude 4.7 or a later model, such as Claude Opus 5.5, Claude Sonnet 5, or Claude Fable 5.1, where `type: "enabled"` returns a 400 error.
* You use Claude 4.7 or a later model, such as Claude Opus 5.5, Claude Sonnet 5, Claude Sonnet 5.5, or Claude Fable 5.1, where `type: "enabled"` returns a 400 error.
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build-with-claude/effort
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build-with-claude/effort
- claude-sonnet-5-5
| Level | Description
| -------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------
| `max` | Absolute maximum capability with no constraints on token spending. Available on Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, Claude Mythos Pre
| `xhigh` | Extended capability for long-horizon work. Available on Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, Claude Opus 5.5, Claude Opus 5, Claude Op
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build-with-claude/context-windows
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build-with-claude/context-windows
Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, Claude Son
Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, Claude Mythos 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5.5, Claude S
Claude Opus 4.7 and later Opus models, Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, and Claude Mythos 5 don't receive these injected tags. On these models, you can give the
Claude Opus 4.7 and later Opus models, Claude Sonnet 5.5, Claude Fable 5.1, Claude Mythos 5.1, Claude Fable 5, and Claude Mythos 5 don't receive these injected tags. On these model
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build-with-claude/context-editing
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build-with-claude/context-editing
On Claude Fable 5.1 and Claude Opus 5.5, server-side context management never invalidates thinking blocks. Client-side edits to earlier turns can invalidate the thinking blocks in
On Claude Fable 5.1, Claude Opus 5.5, and Claude Sonnet 5.5, server-side context management never invalidates thinking blocks. Client-side edits to earlier turns can invalidate the
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build-with-claude/compaction-threshold
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build-with-claude/compaction-threshold
- claude-sonnet-5-5
On Claude Fable 5.1, Claude Mythos 5.1, and Claude Opus 5.5, thinking blocks from before a `compaction` block aren't carried forward, so the summary is all the model has of that ea
On Claude Fable 5.1, Claude Mythos 5.1, Claude Opus 5.5, and Claude Sonnet 5.5, thinking blocks from before a `compaction` block aren't carried forward, so the summary is all the m
On Claude Fable 5.1 and Claude Opus 5.5, remove the `thinking` and `redacted_thinking` blocks from any assistant turn you re-insert after the compaction block, or send `thinking.bl
On Claude Fable 5.1, Claude Opus 5.5, and Claude Sonnet 5.5, remove the `thinking` and `redacted_thinking` blocks from any assistant turn you re-insert after the compaction block,
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build-with-claude/compaction-thinking-blocks
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build-with-claude/compaction-thinking-blocks
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build-with-claude/compaction-on-demand
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build-with-claude/compaction-keep-recent-turns
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build-with-claude/compaction-background
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build-with-claude/compaction-background
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build-with-claude/claude-platform-on-aws
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build-with-claude/claude-platform-on-aws
| Claude Sonnet 5.5 | `claude-sonnet-5-5` |
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build-with-claude/claude-on-vertex-ai
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build-with-claude/claude-on-vertex-ai
| Claude Sonnet 5.5 | `claude-sonnet-5-5` |
Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, and Claude Sonnet 4.6 have a [1M-token context
Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5.5, Claude Sonnet 5, and Claude Sonnet 4.6 have
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build-with-claude/claude-on-amazon-bedrock-legacy
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build-with-claude/claude-on-amazon-bedrock-legacy
Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Opus 4.8, and Claude Opus 4.7 are reachable through `InvokeModel` on `bedrock-runtime`.
Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5.5, Claude Sonnet 5, Claude Opus 4.8, and Claude Opus 4.7 are reachable through `InvokeModel` on
[Mid-conversation system messages](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages) are available through the InvokeModel API for Claude Fabl
[Mid-conversation system messages](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages) are available through the InvokeModel API for Claude Fabl
Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, Claude Sonnet 5, and Claude Sonnet 4.6 have a [1M-token context
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build-with-claude/claude-in-microsoft-foundry
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build-with-claude/claude-in-microsoft-foundry
This guide shows you how to set up and make API calls to Claude in Microsoft Foundry using one of Anthropic's client SDKs or direct HTTP requests. When you access Claude in Microso
This guide shows you how to set up and make API calls to Claude in Microsoft Foundry using one of Anthropic's client SDKs or direct HTTP requests. When you access Claude in Microso
Claude Sonnet 5.5 supports only Global Standard deployments.
* **Region scope:** Select Global, or for models hosted on Azure, Data Zone. Selecting Data Zone creates a US Data Zone Standard deployment, which keeps inference within the Uni
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build-with-claude/claude-in-amazon-bedrock
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build-with-claude/claude-in-amazon-bedrock
| Claude Sonnet 5.5 | `anthropic.claude-sonnet-5-5` | [See Access](https://platform.claude.com/docs/en/build-with-
The global endpoint is available for Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Sonnet 5, and Claude Haiku 4.5. For
The global endpoint is available for Claude Fable 5.1, Claude Fable 5, Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Sonnet 5.5, Claude Sonnet 5, and Cla
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build-with-claude/batch-processing
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build-with-claude/batch-processing
| Claude Sonnet 5.5 | $1 / MTok | $5 / MTok |
The `output-300k-2026-03-24` beta header raises the `max_tokens` cap to 300,000 for batch requests using Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Op
The `output-300k-2026-03-24` beta header raises the `max_tokens` cap to 300,000 for batch requests using Claude Opus 5.5, Claude Opus 5, Claude Opus 4.8, Claude Opus 4.7, Claude Op
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api/service-tiers
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api/service-tiers
Priority Tier is supported on all available Claude models except Claude Fable 5.1, Claude Mythos 5.1, Claude Mythos 5, [Claude Mythos Preview](https://anthropic.com/glasswing), Cla
Priority Tier is supported on all available Claude models except Claude Fable 5.1, Claude Mythos 5.1, Claude Mythos 5, [Claude Mythos Preview](https://anthropic.com/glasswing), Cla
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api/rate-limits
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api/rate-limits
| Claude Sonnet 5.5 | 1,000 | 2,
| Claude Sonnet 5.5 | 5,000 | 5,
| Claude Sonnet 5.5 | 10,000 | 10
*3 Sonnet 4.x rate limit is a total limit that applies to combined traffic across Sonnet 4.6 and Sonnet 4.5. Claude Sonnet 5 has a separate rate limit and is not part of this combi
*3 Sonnet 4.x rate limit is a total limit that applies to combined traffic across Sonnet 4.6 and Sonnet 4.5. Claude Sonnet 5.5 and Claude Sonnet 5 each have a separate rate limit a
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api/errors
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api/errors
On Claude Sonnet 5.5, thinking can't be set to `disabled`. Use `thinking: {"type": "between_tools"}` for the lowest thinking setting, which turns off up-front thinking. Sending `th
```text wrap
"thinking.type.disabled" is not supported for this model. Use "thinking.type.between_tools" for the lowest thinking setting, or "thinking.type.adaptive" and "output_config.effort"
```
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agents-and-tools/tool-use/tool-search-tool
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agents-and-tools/tool-use/tool-search-tool
| Claude Sonnet 5.5 (claude-sonnet-5-5) | `tool_search_tool_regex_20251119`, `tool_search_tool_bm25_20251119` |
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agents-and-tools/tool-use/programmatic-tool-calling
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agents-and-tools/tool-use/programmatic-tool-calling
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agents-and-tools/tool-use/parallel-tool-use
When `tool_choice` type is `any` or `tool`, setting `disable_parallel_tool_use: true` means Claude calls exactly one tool. Claude Opus 5.5, Claude Fable 5.1, and Claude Mythos 5.1
When `tool_choice` type is `any` or `tool`, setting `disable_parallel_tool_use: true` means Claude calls exactly one tool. Claude Opus 5.5, Claude Sonnet 5.5, Claude Fable 5.1, and
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agents-and-tools/tool-use/overview
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agents-and-tools/tool-use/overview
| Claude Sonnet 5.5 | 286 tokens
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agents-and-tools/tool-use/define-tools
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agents-and-tools/tool-use/define-tools
| Claude Opus 5.5, Claude Fable 5.1, and [Claude Mythos 5.1](https://anthropic.com/glasswing) | `any` and `tool` return a [400 error](https:
| Claude Opus 5.5, Claude Sonnet 5.5, Claude Fable 5.1, and [Claude Mythos 5.1](https://anthropic.com/glasswing) | `any` and `tool` return a [400 error](https:
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agents-and-tools/tool-use/computer-use-tool
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agents-and-tools/tool-use/computer-use-tool
- claude-sonnet-5-5
- On Amazon Bedrock, Claude Opus 5.5 accepts the earlier `computer_20251124` tool version as Claude Opus 5 does.
- On Amazon Bedrock, Claude Opus 5.5 and Claude Sonnet 5.5 accept the earlier `computer_20251124` tool version as Claude Opus 5 and Claude Sonnet 5 do.
* On Claude Fable 5.1 and Claude Opus 5.5, avoid pruning on the client: removing an earlier screenshot [invalidates every later thinking block](https://platform.claude.com/docs/en/
* On Claude Fable 5.1, Claude Opus 5.5, and Claude Sonnet 5.5, avoid pruning on the client: removing an earlier screenshot [invalidates every later thinking block](https://platform
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agents-and-tools/tool-use/advisor-tool
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agents-and-tools/tool-use/advisor-tool
Claude Fable 5.1, Claude Mythos 5.1, Claude Opus 5.5, Claude Opus 5, Claude Fable 5, and Claude Mythos 5 advisors return the encrypted `advisor_redacted_result`. Every other advi
Claude Sonnet 5.5, Claude Fable 5.1, Claude Mythos 5.1, Claude Opus 5.5, Claude Opus 5, Claude Fable 5, and Claude Mythos 5 advisors return the encrypted `advisor_redacted_result
To force a consult on a specific request instead of nudging, set `tool_choice` to `{"type": "tool", "name": "advisor"}`, subject to the constraints in [Forcing tool use](https://pl
To force a consult on a specific request instead of nudging, set `tool_choice` to `{"type": "tool", "name": "advisor"}`, subject to the constraints in [Forcing tool use](https://pl
| Executor models | Advisor models
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agents-and-tools/agent-skills/claude-api-skill
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agents-and-tools/agent-skills/claude-api-skill
* **Model migration:** Step-by-step guidance for migrating to newer Claude models (including the breaking changes and behavior shifts on [Claude Opus 5.5](https://platform.claude.c
* **Model migration:** Step-by-step guidance for migrating to newer Claude models (including the breaking changes and behavior shifts on [Claude Opus 5.5](https://platform.claude.c
* **Refusal fallback configuration**, adding `stop_reason: "refusal"` handling before reading response content and setting up a [fallback retry path](https://platform.claude.com/do
* **Refusal fallback configuration**, adding `stop_reason: "refusal"` handling before reading response content and setting up a [fallback retry path](https://platform.claude.com/do
For the full list of model-specific changes the skill applies, see [Migrating to Claude Opus 5.5 from Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5-5/migration-g
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about-claude/pricing
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about-claude/pricing
| Claude Sonnet 5.5 | $2 / MTok | $2.50 / MTok |
| Claude Sonnet 5.5 | $1 / MTok | $5 / MTok |
| Claude Sonnet 5.5 | 286 tokens
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| Speed and capability for everyday coding, agent, and enterprise workloads | Claude Sonnet 5 | Code generation, data analysis, content creation, visual understanding, ag
| Speed and capability for everyday coding, agent, and enterprise workloads | Claude Sonnet 5.5 | Code generation, data analysis, content creation, visual understanding, ag
<Card title="What's new in Claude Sonnet 5.5" icon="sparkle" href="https://platform.claude.com/docs/en/models/sonnet-5-5/whats-new-sonnet-5-5">
The latest Sonnet model: breaking changes, new features, and behavior differences
</Card>
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about-claude/model-deprecations
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about-claude/model-deprecations
| claude-sonnet-5-5 | Active | N/A | Not sooner than September 28, 2027 |
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cli-sdks-libraries/overview
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cli-sdks-libraries/overview
title: CLI, SDKs, and libraries
title: SDKs, CLI, and libraries
description: "Official tools for building with the Claude API: the ant CLI, client SDKs in seven languages, and framework-specific libraries."
description: "Official tools for building with the Claude API: client SDKs in seven languages, the ant CLI, and framework-specific libraries."
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build-with-claude/thinking
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build-with-claude/thinking
Thinking removes that constraint. When thinking is active, Claude works through the problem in its own words before answering: it restates what is being asked, tries approaches, ch
Thinking removes that constraint. When thinking is active, Claude works through the problem in its own words before answering: it restates what is being asked, tries approaches, ch
, where they can also res
Web search is enabled for your organization unless an administrator has disabled it in the [Claude Console](https://platform.claude.com/settings/capabilities), where they can als
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agents-and-tools/tool-use/advisor-tool
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Claude Fable 5.1, Claude Mythos 5.1, Claude Opus 5, Claude Fable 5, and Claude Mythos 5 advisors return the encrypted `advisor_redacted_result`. Every other advisor model in the
Claude Fable 5.1, Claude Mythos 5.1, Claude Opus 5.5, Claude Opus 5, Claude Fable 5, and Claude Mythos 5 advisors return the encrypted `advisor_redacted_result`. Every other advi
To force a consult on a specific request instead of nudging, set `tool_choice` to `{"type": "tool", "name": "advisor"}`, subject to the constraints in [Forcing tool use](https://pl
To force a consult on a specific request instead of nudging, set `tool_choice` to `{"type": "tool", "name": "advisor"}`, subject to the constraints in [Forcing tool use](https://pl
| Executor models | Advisor models
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manage-claude/analytics-api
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manage-claude/analytics-api
**Engagement and adoption endpoints** (user activity, summaries, projects, skills, connectors) return a per-day snapshot for the date you specify. Data for a given day is typically
**Engagement and adoption endpoints** (user activity, summaries, projects, skills, connectors) return a per-day snapshot for the date you specify. Data for a given day is typically
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build-with-claude/overview
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build-with-claude/overview
| [Agent Skills](https://platform.claude.com/docs/en/agents-and-tools/agent-skills/overview) | Extend Claude's capabilities with Skills. Use pre-built
| [Agent Skills](https://platform.claude.com/docs/en/agents-and-tools/agent-skills/overview) | Extend Claude's capabilities with Skills. Use pre-built
| Feature | Description
| ------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------
| [Files API](https://platform.claude.com/docs/en/build-with-claude/files) | Upload and manage files to use with Claude without re-uploading content with each request. Supports PDF
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build-with-claude/mid-conversation-system-messages
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build-with-claude/mid-conversation-system-messages
[Mid-conversation tool changes](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages#mid-conversation-tool-changes) are in beta on the same mode
[Mid-conversation tool changes](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-messages#mid-conversation-tool-changes) are in beta on the same mode
The `tools` array sits even earlier in the hashed request prefix than the top-level `system` field, so editing it invalidates the [prompt cache](https://platform.claude.com/docs/en
`tool_addition` and `tool_removal` are content blocks in the `content` array of a `role: "system"` message, and they can be mixed with `text` blocks in the same message. The messag
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build-with-claude/files
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build-with-claude/files
Claude Platform on AWS: beta
Claude Platform on AWS: ga
availability: beta
availability: ga
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build-with-claude/claude-platform-on-aws
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build-with-claude/claude-platform-on-aws
| **Agent Skills** | Available in beta (no beta header needed, same behavior as on the Claude API)
| **Agent Skills** | Available
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agents-and-tools/tool-use/web-fetch-tool
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The latest web fetch tool version (`web_fetch_20260318`) supports **dynamic filtering**: Claude can write and execute code to filter fetched content before it reaches the context w
The latest web fetch tool version (`web_fetch_20260318`) supports **dynamic filtering**: Claude can write and execute code to filter fetched content before it reaches the context w
"model": "claude-opus-4-8",
"model": "claude-opus-5-5",
model: claude-opus-4-8
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agents-and-tools/agent-skills/overview
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agents-and-tools/agent-skills/overview
Claude Platform on AWS and Microsoft Foundry inherit the same Skills behavior as the Claude API in all following sections.
Claude Platform on AWS and Microsoft Foundry inherit the same Skills behavior as the Claude API in all following sections, except where [Limitations and constraints](https://plat
Claude Platform on AWS and Microsoft Foundry follow the same limitations as the Claude API in the following subsections.
Claude Platform on AWS and Microsoft Foundry follow the same limitations as the Claude API in the following subsections. In addition, on Microsoft Foundry, the [Skill version downl
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test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
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test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
Usage metrics are still provided in the response, even when the response is refused.
When a refusal arrives before Claude generates any output, you are not billed for the request on the Claude API, and the usage counts in that response are informational only. Whe
Usage metrics are still provided in the response, even when the response is refused. Whether a refused request is billed depends on when the refusal arrives and its category; see
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release-notes/overview
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release-notes/overview
### September 24, 2026
* We're resuming billing for refusals that arrive before any output when `stop_details.category` is `"bio"`, `"frontier_llm"`, or `"reasoning_extraction"`, the categories where we
* The [Compliance API](https://platform.claude.com/docs/en/manage-claude/compliance-api) local session endpoints are out of beta for Claude for Microsoft 365 sessions in Excel, Pow
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models/sonnet-4-6/overview
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models/sonnet-4-6/overview
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-sonnet-4-6">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-sonnet-4-6">
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models/sonnet-4-5/overview
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<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-sonnet-4-5">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-sonnet-4-5">
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models/opus-5/overview
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models/opus-5/overview
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-5">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-5">
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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
Claude Opus 5.5 ships with safety classifiers, and everything in [Refusals and fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) applies. A dec
Claude Opus 5.5 ships with safety classifiers, and everything in [Refusals and fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) applies. A dec
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models/opus-4-8/overview
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models/opus-4-8/overview
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-4-8">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-8">
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models/opus-4-7/overview
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-4-7">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-7">
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<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-4-6">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-6">
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models/opus-4-5/overview
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models/opus-4-5/overview
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-4-5">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-5">
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models/haiku-4-5/overview
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-haiku-4-5">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-haiku-4-5">
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models/fable-5/overview
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models/fable-5/overview
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-fable-5">
<Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-fable-5">
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models/fable-5/migration-guide
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models/fable-5/migration-guide
You are not billed for the input tokens of a request refused before any output is generated. When a classifier fires mid-stream, the input and already-streamed output are billed
A refusal that arrives before any output is billed when its category is `"bio"`, `"frontier_llm"`, or `"reasoning_extraction"`. A refusal before any output in any other category
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models/fable-5/introducing-claude-fable-5-and-claude-mythos-5
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models/fable-5/introducing-claude-fable-5-and-claude-mythos-5
You are not billed for a request that is refused before any output is generated. When you retry on another model, [fallback credit](https://platform.claude.com/docs/en/build-with-c
A refusal that arrives before any output is billed when it is in a category with low volumes of false positives, to disrupt attempts to circumvent Anthropic's safeguards at scale.
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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
* **Billing:** you aren't billed for a refusal that arrives before any output, and, for Claude Fable 5.1, [fallback credit](https://platform.claude.com/docs/en/build-with-claude/fa
* **Billing:** a refusal that arrives before any output is billed when it's in a category with low volumes of false positives, to disrupt attempts to circumvent Anthropic's safegua
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managed-agents/vaults
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
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managed-agents/tools
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
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<MultiFileExample language="cli" label="CLI">
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
[`ant apply`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/apply) uploads the `skills/pr-summary` directory, prints the new skill's ID, and records it in `claude-
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<MultiFileExample language="cli" label="CLI">
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</MultiFileExample>
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managed-agents/scheduled-deployments
<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
[`ant apply`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/apply) prints the new deployment's ID and records it in `claude-lock.json`. To see the deployment objec
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managed-agents/reference
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managed-agents/reference
| Flag | Description
| ---------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------
| `--environment-id` | The environment to poll for work. Also reads from `ANTHROPIC_ENVIRONMENT_ID`.
| `--environment-key` | Authenticates the worker with this environment. Also reads from `ANTHROPIC_ENVIRONMENT_KEY`.
| `--workdir` | Directory where skills are downloaded and tools read and write files. Defaults to `.` (the current directory); the system default working directory is `/
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managed-agents/quickstart
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managed-agents/quickstart
```bash cURL
set -euo pipefail
agent=$(
curl -sS --fail-with-body https://api.anthropic.com/v1/agents \
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managed-agents/permission-policies
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
</CodeGroupItem>
<MultiFileExample language="cli" label="CLI">
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
</CodeGroupItem>
<MultiFileExample language="cli" label="CLI">
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
</CodeGroupItem>
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managed-agents/mcp-connector
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<MultiFileExample language="cli" label="CLI">
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</MultiFileExample>
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
</CodeGroupItem>
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managed-agents/environments
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<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
[`ant apply`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/apply) creates the environment from `environment.yaml`, prints its ID, and records it in `claude-lock.j
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managed-agents/agent-setup
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managed-agents/agent-setup
<MultiFileExample language="cli" label="CLI">
<CodeGroupItem>
</MultiFileExample>
[`ant apply`](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/apply) creates the agent from `coding-assistant.md`, prints its ID, and records it in `claude-lock.json
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manage-claude/workspaces
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* **Default Workspace** has a `wrkspc_` ID like any other workspace (returned in the [`anthropic-workspace-id` response header](https://platform.claude.com/docs/en/manage-claude/wo
* **Default Workspace** has a `wrkspc_` ID like any other workspace (returned in the [`anthropic-workspace-id` response header](https://platform.claude.com/docs/en/manage-claude/wo
For complete parameter details and response schemas, see the [Workspaces API reference](https://platform.claude.com/docs/en/api/admin/workspaces/retrieve).
For complete parameter details and response schemas, see the [Workspaces API reference](https://platform.claude.com/docs/en/api/beta/organization/workspaces/retrieve).
For complete parameter details, see the [Workspace Members API reference](https://platform.claude.com/docs/en/api/admin/workspaces/members/retrieve).
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To manage these resources programmatically, see [Manage WIF with the Admin API](https://platform.claude.com/docs/en/manage-claude/wif-admin-api) for the curl walkthrough, or see th
To manage these resources programmatically, see [Manage WIF with the Admin API](https://platform.claude.com/docs/en/manage-claude/wif-admin-api) for the curl walkthrough, or see th
* [Admin API reference](https://platform.claude.com/docs/en/api/admin): generated request and response schemas for every Admin API endpoint
* [Admin API reference](https://platform.claude.com/docs/en/api/beta/organization): generated request and response schemas for every Admin API endpoint
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manage-claude/wif-reference
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| `workspace:developer` | All non-administrative Claude API endpoints in the rule's workspace: [Messages](https://platform.claude.com/docs/en/api/messages) (including streamin
| `workspace:inference` | The inference endpoints in the rule's workspace: [Messages](https://platform.claude.com/docs/en/api/messages) (including streaming and token counting
| `workspace:developer` | All non-administrative Claude API endpoints in the rule's workspace: [Messages](https://platform.claude.com/docs/en/api/messages) (including streamin
| `workspace:inference` | The inference endpoints in the rule's workspace: [Messages](https://platform.claude.com/docs/en/api/messages) (including streaming and token counting
For complete parameter details and response schemas, see the [Service accounts API reference](https://platform.claude.com/docs/en/api/admin/service_accounts), [Federation issuers A
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manage-claude/wif-admin-api
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For complete parameter details and response schemas, see the [Service accounts API reference](https://platform.claude.com/docs/en/api/admin/service_accounts).
For complete parameter details and response schemas, see the [Service accounts API reference](https://platform.claude.com/docs/en/api/beta/organization/service_accounts).
For complete parameter details and response schemas, see the [Federation issuers API reference](https://platform.claude.com/docs/en/api/admin/federation_issuers).
For complete parameter details and response schemas, see the [Federation issuers API reference](https://platform.claude.com/docs/en/api/beta/organization/federation/issuers).
For complete parameter details and response schemas, see the [Federation rules API reference](https://platform.claude.com/docs/en/api/admin/federation_rules).
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This page covers managing the people in your **Claude Enterprise** (claude.ai) organization programmatically, using the [Admin API](https://platform.claude.com/docs/en/api/admin):
This page covers managing the people in your **Claude Enterprise** (claude.ai) organization programmatically, using the [Admin API](https://platform.claude.com/docs/en/api/beta/org
For complete parameter details and response schemas, see [List users](https://platform.claude.com/docs/en/api/admin/users/list) in the API reference.
For complete parameter details and response schemas, see [List users](https://platform.claude.com/docs/en/api/beta/organization/users/list) in the API reference.
For complete parameter details and response schemas, see [Get user](https://platform.claude.com/docs/en/api/admin/users/retrieve) in the API reference.
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manage-claude/usage-cost-api
| Your organization | API | Key type
| -------------------------------- | ----------------------------------------------------------------------------------------------------------------------- | ---------------------
| Claude Console (Claude Platform) | The Usage and Cost Admin API described on this page | Admin API key (`sk-an
| Claude Enterprise (claude.ai) | The [Claude Enterprise Analytics API](https://platform.claude.com/docs/en/api/admin/analytics) cost and usage endpoints | Analytics API key
| Your organization | API | Key type
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manage-claude/spend-limits-api
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manage-claude/spend-limits-api
For complete parameter details and response schemas, see [List effective spend limits](https://platform.claude.com/docs/en/api/admin/spend_limits/list_effective) in the API referen
For complete parameter details and response schemas, see [List effective spend limits](https://platform.claude.com/docs/en/api/beta/organization/spend_limits/list_effective) in the
For complete parameter details and response schemas, see [Retrieve a spend limit](https://platform.claude.com/docs/en/api/admin/spend_limits/retrieve) in the API reference.
For complete parameter details and response schemas, see [Retrieve a spend limit](https://platform.claude.com/docs/en/api/beta/organization/spend_limits/retrieve) in the API refere
For complete parameter details and response schemas, see [Create a spend limit](https://platform.claude.com/docs/en/api/admin/spend_limits/create) in the API reference.
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manage-claude/rate-limits-api
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manage-claude/rate-limits-api
For complete parameter details and response schemas, see the [Organization Rate Limits API reference](https://platform.claude.com/docs/en/api/admin/rate_limits/list).
For complete parameter details and response schemas, see the [Organization Rate Limits API reference](https://platform.claude.com/docs/en/api/beta/organization/rate_limits/list).
For complete parameter details and response schemas, see the [Workspace Rate Limits API reference](https://platform.claude.com/docs/en/api/admin/workspaces/rate_limits/list).
For complete parameter details and response schemas, see the [Workspace Rate Limits API reference](https://platform.claude.com/docs/en/api/beta/organization/workspaces/rate_limits/
To retrieve your organization's workspace IDs, use the [List Workspaces](https://platform.claude.com/docs/en/api/admin/workspaces/list) endpoint, or find them in the [Claude Cons
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manage-claude/compliance-sessions
The endpoints on this page are available only to Claude Enterprise organizations. The local and remote session endpoints are stable for Cowork and Claude Code sessions; coverage
The endpoints on this page are available only to Claude Enterprise organizations. The local and remote session endpoints are stable for Cowork, Claude Code, and Claude for Micros
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manage-claude/compliance-faq
The local and remote session endpoints are stable for Cowork and Claude Code sessions; coverage of Claude Science, Claude for Microsoft 365, and Claude in Chrome sessions is in
The local and remote session endpoints are stable for Cowork, Claude Code, and Claude for Microsoft 365 sessions; coverage of Claude Science and Claude in Chrome sessions is in
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api
manage-claude/compliance-errors
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manage-claude/compliance-errors
**Fix:** Use `GET /v1/compliance/apps/projects/{project_id}/attachments` to list current attachments. If the document is missing, it was deleted; retrieve it through a `claude_proj
**Fix:** Use `GET /v1/compliance/apps/projects/{project_id}/attachments` to list current attachments. If the document is missing, it was deleted; retrieve it through a `claude_proj
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api
manage-claude/compliance-activity-feed
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manage-claude/compliance-activity-feed
| Field | Type | Description
| ------------------- | --------------- | ------------------------------------------------------------------------------------------------------------------------------------------
| `id` | string | Unique identifier for the activity.
| `created_at` | RFC 3339 string | When the activity occurred.
| `organization_id` | string or null | Organization where the activity occurred, or `null` for events not tied to an organization (sign-in, sign-out, Compliance API calls).
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Recorded here 25 Sep 2026 15:37 UTC
api
manage-claude/cmek-google-cloud-kms
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manage-claude/cmek-google-cloud-kms
**Finding your organization ID:** Copy the **Organization ID** field under **Settings > Organization** in the Claude Console, or under **Organization settings > Organization*
**Finding your organization ID:** Copy the **Organization ID** field under **Settings > Organization** in the Claude Console, or under **Organization settings > Organization*
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Recorded here 25 Sep 2026 15:37 UTC
api
manage-claude/cmek-azure-key-vault
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manage-claude/cmek-azure-key-vault
**Finding your organization ID:** Copy the **Organization ID** field under **Settings > Organization** in the Claude Console, or under **Organization settings > Organization*
**Finding your organization ID:** Copy the **Organization ID** field under **Settings > Organization** in the Claude Console, or under **Organization settings > Organization*
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Recorded here 25 Sep 2026 15:37 UTC
api
manage-claude/cmek-aws-kms
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manage-claude/cmek-aws-kms
**Finding your organization ID:** Copy the **Organization ID** field under **Settings > Organization** in the Claude Console, or under **Organization settings > Organization*
**Finding your organization ID:** Copy the **Organization ID** field under **Settings > Organization** in the Claude Console, or under **Organization settings > Organization*
**Finding your compartment ID:** Each workspace has a compartment ID that scopes its CMEK data. To find it in the Claude Console, go to [Manage > Security](https://platform.c
**Finding your compartment ID:** Each workspace has a compartment ID that scopes its CMEK data. To find it in the Claude Console, go to [Manage > Security](https://platform.c
The key policy has three statements: your account's root admin statement; a statement that lets the Claude Platform on AWS service principal encrypt, decrypt, and generate data key
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api
manage-claude/claude-code-analytics-api
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manage-claude/claude-code-analytics-api
For complete parameter details and response schemas, see the [Claude Code Analytics API reference](https://platform.claude.com/docs/en/api/admin/usage_report/retrieve_claude_code).
For complete parameter details and response schemas, see the [Claude Code Analytics API reference](https://platform.claude.com/docs/en/api/beta/organization/usage_report/retrieve_c
* [Admin API reference](https://platform.claude.com/docs/en/api/admin)
* [Admin API reference](https://platform.claude.com/docs/en/api/beta/organization)
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api
manage-claude/authentication
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manage-claude/authentication
Store API keys in a secrets manager, rotate them periodically, and disable or delete any key you suspect has leaked. On the [API keys page](https://platform.claude.com/settings/key
Store API keys in a secrets manager, rotate them periodically, and disable or delete any key you suspect has leaked. On the [API keys page](https://platform.claude.com/settings/key
You can find a workspace's ID in the **ID** column of [Settings → Workspaces](https://platform.claude.com/settings/workspaces) in the Claude Console, or by calling the [List Worksp
You can find a workspace's ID in the **ID** column of [Settings → Workspaces](https://platform.claude.com/settings/workspaces) in the Claude Console, or by calling the [List Worksp
The Console API keys table shows each key's expiration, and the Admin API reports each key's `expires_at` timestamp on the [List API Keys](https://platform.claude.com/docs/en/api/a
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api
manage-claude/analytics-api
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manage-claude/analytics-api
The key types are not interchangeable: an Admin API key cannot call the Claude Enterprise Analytics API, and an Analytics API key cannot call the Admin API. Both APIs appear under
The key types are not interchangeable: an Admin API key cannot call the Claude Enterprise Analytics API, and an Analytics API key cannot call the Admin API. Both APIs appear under
For the available metrics, request parameters, and response schema, see the [Claude Code Analytics API guide](https://platform.claude.com/docs/en/manage-claude/claude-code-analytic
For the available metrics, request parameters, and response schema, see the [Claude Code Analytics API guide](https://platform.claude.com/docs/en/manage-claude/claude-code-analytic
Pass the key in the `x-api-key` header and include the [`anthropic-version`](https://platform.claude.com/docs/en/api/versioning) header on every request. Endpoints live under `
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