126 pages for claude-sonnet-5.
Titles and paths first, then pages whose text carries it. Each row opens that page as this site last read it.
errors
Claude Developer Platform · in the page
api/errors
…\ -H "content-type: application/json" \ -d '{ "model": "claude-sonnet-5", "max_tokens": 1024, "messages": [{"role": "user", "content": "Hello, Claude"}] }' ``` ```ba…
Messages
Claude Developer Platform · in the page
api/messages
…aiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-fable-5-1"` Frontier intelligence for ambitious…
Batches
Claude Developer Platform · in the page
api/messages/batches
…"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-fable-5-1"` Frontier intelligence fo…
Create a Message Batch
Claude Developer Platform · in the page
api/messages/batches/create
…"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-fable-5-1"` Frontier intelligence fo…
Retrieve Message Batch results
Claude Developer Platform · in the page
api/messages/batches/results
…Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-fable-5-1"` Frontier int…
Count tokens in a Message
Claude Developer Platform · in the page
api/messages/count_tokens
…aiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-fable-5-1"` Frontier intelligence for ambitious…
Create a Message
Claude Developer Platform · in the page
api/messages/create
…aiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-fable-5-1"` Frontier intelligence for ambitious…
claude-in-amazon-bedrock
Claude Developer Platform · in the page
build-with-claude/claude-in-amazon-bedrock
…| `anthropic.claude-sonnet-5-5` | [See Access](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock#access) | | C…
claude-in-microsoft-foundry
Claude Developer Platform · in the page
build-with-claude/claude-in-microsoft-foundry
…| `claude-sonnet-5-5` | ✓ | ✓ | | Claude Sonnet 5…
claude-on-vertex-ai
Claude Developer Platform · in the page
build-with-claude/claude-on-vertex-ai
…| `claude-sonnet-5-5` | | Claude Sonnet 5…
claude-platform-on-aws
Claude Developer Platform · in the page
build-with-claude/claude-platform-on-aws
…| `claude-sonnet-5-5` | | Claude Sonnet 5 | `cl…
sent_count = len(messages sent in the compaction request)
Claude Developer Platform · in the page
build-with-claude/compaction
…de-opus-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-opus-4-6`, `claude-sonnet-5`, `claude-sonnet-4-6` - Platforms: Claude API (beta), Claude Platform on AWS (beta), Amazon Bedrock (beta), Google…
compaction-background
Claude Developer Platform · in the page
build-with-claude/compaction-background
…- claude-opus-4-8 - claude-opus-4-7 - claude-opus-4-6 - claude-sonnet-5-5 - claude-sonnet-5 - claude-sonnet-4-6 - claude-haiku-5-5 supportedPlatforms: Claude API: beta…
compaction-keep-recent-turns
Claude Developer Platform · in the page
build-with-claude/compaction-keep-recent-turns
…- claude-opus-4-8 - claude-opus-4-7 - claude-opus-4-6 - claude-sonnet-5-5 - claude-sonnet-5 - claude-sonnet-4-6 - claude-haiku-5-5 supportedPlatforms: Claude API: beta…
compaction-on-demand
Claude Developer Platform · in the page
build-with-claude/compaction-on-demand
…- claude-opus-4-8 - claude-opus-4-7 - claude-opus-4-6 - claude-sonnet-5-5 - claude-sonnet-5 - claude-sonnet-4-6 - claude-haiku-5-5 supportedPlatforms: Claude API: beta…
compaction-thinking-blocks
Claude Developer Platform · in the page
build-with-claude/compaction-thinking-blocks
…- claude-opus-4-8 - claude-opus-4-7 - claude-opus-4-6 - claude-sonnet-5-5 - claude-sonnet-5 - claude-sonnet-4-6 - claude-haiku-5-5 supportedPlatforms: Claude API: beta…
compaction-threshold
Claude Developer Platform · in the page
build-with-claude/compaction-threshold
…- claude-opus-4-8 - claude-opus-4-7 - claude-opus-4-6 - claude-sonnet-5-5 - claude-sonnet-5 - claude-sonnet-4-6 - claude-haiku-5-5 supportedPlatforms: Claude API: beta…
effort
Claude Developer Platform · in the page
build-with-claude/effort
…e-opus-4-7 - claude-opus-4-6 - claude-opus-4-5-20251101 - claude-sonnet-5-5 - claude-sonnet-5 - claude-sonnet-4-6 - claude-haiku-5-5 supportedPlatforms: Claude API: ga…
fallback-credit
Claude Developer Platform · in the page
build-with-claude/fallback-credit
…it is Claude Opus 4.8. For Claude Sonnet 5.5, it is Claude Sonnet 5 (`claude-sonnet-5`). <Accordion title="Looking up permitted fallback targets programmatically"> On the Claude API and Claude Plat…
mid-conversation-system-messages
Claude Developer Platform · in the page
build-with-claude/mid-conversation-system-messages
…orm.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5#mid-turn-user-messages-and-task-budgets) and [Prompting Claude Haiku 5.5](https://platform.claude.com/docs/en/bu…
claude-prompting-best-practices
Claude Developer Platform · in the page
build-with-claude/prompt-engineering/claude-prompting-best-practices
…orm.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5) | Differences from Claude Sonnet 5: effort calibration, initiative and scope, running without up-front thinking…
structured-outputs
Claude Developer Platform · in the page
build-with-claude/structured-outputs
…- claude-opus-4-8 - claude-opus-4-7 - claude-opus-4-6 - claude-sonnet-5-5 - claude-sonnet-5 - claude-sonnet-4-6 - claude-sonnet-4-5-20250929 - claude-opus-4-5-20251101…
task-budgets
Claude Developer Platform · in the page
build-with-claude/task-budgets
…- claude-opus-5 - claude-opus-4-8 - claude-opus-4-7 - claude-sonnet-5-5 - claude-haiku-5-5 --- Task budgets let you tell Claude how many tokens it has for a full agentic loop, inc…
thinking
Claude Developer Platform · in the page
build-with-claude/thinking
…\ -H "content-type: application/json" \ -d '{ "model": "claude-sonnet-5", "max_tokens": 4096, "thinking": {"type": "disabled"}, "messages": [ { "role"…
thinking-steering-and-cost
Claude Developer Platform · in the page
build-with-claude/thinking-steering-and-cost
…orm.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-sonnet-5-5#calibrate-effort) and [Prompting Claude Haiku 5.5](https://platform.claude.com/docs/en/build-with-claude/prompt-…
API usage primer for Claude
Claude Developer Platform · in the page
claude_api_primer
…s model: Claude Opus 5: claude-opus-5 Smart model: Claude Sonnet 5.5: claude-sonnet-5-5 Previous Sonnet model: Claude Sonnet 5: claude-sonnet-5 For fast, cost-effective tasks: Claude Haiku 5.5: claude…
home
Claude Developer Platform · in the page
home
….5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) (`claude-sonnet-5-5`) — New — *The best combination of speed and intelligence* — Everyday tasks · Writing · Cost-efficient * [Cl…
intro
Claude Developer Platform · in the page
intro
….5](https://platform.claude.com/docs/en/models/sonnet-5-5/overview) (`claude-sonnet-5-5`) — New — *The best combination of speed and intelligence* — Everyday tasks · Writing · Cost-efficient * [Claude…
dreams
Claude Developer Platform · in the page
managed-agents/dreams
…ude-opus-5`, `claude-fable-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-sonnet-5-5`, `claude-sonnet-5`, and `claude-sonnet-4-6` are supported. You can optionally pass `instructions` (csharp, go:…
multiagent-orchestration
Claude Developer Platform · in the page
managed-agents/multiagent-orchestration
…n/json" \ -d '{ "name": "Backend engineer", "model": "claude-sonnet-5", "system": "You implement backend features end to end. Consult the advisor before major backend design deci…
sessions
Claude Developer Platform · in the page
managed-agents/sessions
…h_overrides", "id": "'"$AGENT_ID"'", "model": {"id": "claude-sonnet-5-5"}, "system": null }, "environment_id": "'"$ENVIRONMENT_ID"'" }' ``` ```bash CLI #…
migration-guide
Claude Developer Platform · in the page
models/opus-5-5/migration-guide
…orm.claude.com/docs/en/models/opus-5-5/migration-guide#migrating-from-claude-sonnet-5). Every reader needs [What every request to Claude Opus 5.5 must satisfy](https://platform.claude.com/docs/en/mode…
Models overview
Claude Developer Platform · in the page
models/overview
…5-5` | `claude-sonnet-5-5` | `claude-haiku-5-5`…
migration-guide
Claude Developer Platform · in the page
models/sonnet-5-5/migration-guide
…te your code for you ```text /claude-api migrate this project to claude-sonnet-5-5 ``` The skill applies the model ID swap and, as needed, breaking parameter changes, prefill replacement, an…
overview
Claude Developer Platform · in the page
models/sonnet-5-5/overview
…28, 2026. The best combination of speed and intelligence Model ID: `claude-sonnet-5-5` Context window: 1M tokens · Max output: 128K tokens · Input pricing: $2 / MTok · Output pricing: $10 / MTok […
whats-new-sonnet-5-5
Claude Developer Platform · in the page
models/sonnet-5-5/whats-new-sonnet-5-5
…--------------------------------------------- | | Claude Sonnet 5.5 | claude-sonnet-5-5 | The best combination of speed and intelligence | [Adaptive thinking](https://platform.claude.com/docs/en/buil…
overview
Claude Developer Platform · in the page
models/sonnet-5/overview
…m.claude.com/docs/en/models/sonnet-5-5/migration-guide#migrating-from-claude-sonnet-5) Model ID: `claude-sonnet-5` Context window: 1M tokens · Max output: 128K tokens · Input pricing: $2 / MTok · Ou…
overview
Claude Developer Platform · in the page
release-notes/overview
…s). ### September 28, 2026 * We've launched **Claude Sonnet 5.5** (`claude-sonnet-5-5`). It's available on the Claude API, [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-c…
claude-fable-5-1
Claude Developer Platform · in the page
release-notes/system-prompts/claude-fable-5-1
…e Haiku 4.5, with model strings 'claude-fable-5-1', 'claude-opus-5', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001'. The person is able to switch models mid-conversation, so previous messages clai…
claude-haiku-4-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-haiku-4-5
…Haiku 4.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', 'claude-haiku-5-5', and 'claude-haiku-4-5-20251001'. Above Opus sits Anthropic's new Mythos tier. The first M…
claude-haiku-5-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-haiku-5-5
…Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Above Opus sits Anthropic's new Mythos tier. The first Mythos-class model, Claude Myt…
claude-opus-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-5
…5. They use the API model strings 'claude-fable-5', 'claude-opus-5', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001'. Above Opus sits Anthropic's new Mythos tier. The first Mythos-class model, Cla…
claude-opus-5-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-5-5
…hey use the API model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001'. Above Opus sits Anthropic's new Mythos tier. The first Mythos-class model, Cla…
claude-sonnet-4-6
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-4-6
…hey use the API model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Claude Sonnet 4.6 (this model, 'claude-sonnet-4-6') is from an earlier generation and…
overview
Claude Developer Platform · in the page
release-notes/system-prompts/overview
…ocs/en/release-notes/system-prompts/claude-haiku-5-5" /> <Card id="claude-sonnet-5-5" title="Claude Sonnet 5.5" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/cl…
overview
Claude Developer Platform · in the page
resources/overview
…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. </Card> <Card title="Claude Opus 5.5 System…
Configure your agent
Claude Code CLI · in the page
agent-sdk/configuration
…pt: "Summarize the open TODOs in this repo", options: { model: "claude-sonnet-5", allowedTools: ["Read", "Glob", "Grep"], maxTurns: 8, cwd: "/path/to/repo", }, })) { if (message.…
Agent SDK reference - Python
Claude Code CLI · in the page
agent-sdk/python
…ndow by default](/docs/en/model-config.md#extended-context), such as `claude-sonnet-5-5` or `claude-opus-5-5`. For a model that reaches 1M only through its `[1m]` variant, append the suffix to the mod…
Agent SDK reference - TypeScript
Claude Code CLI · in the page
agent-sdk/typescript
…ndow by default](/docs/en/model-config.md#extended-context), such as `claude-sonnet-5-5` or `claude-opus-5-5`. For a model that reaches 1M only through its `[1m]` variant, append the suffix to the mod…
Claude Code on Amazon Bedrock
Claude Code CLI · in the page
amazon-bedrock
…ith `anthropic.` and without a version suffix, for example `anthropic.claude-sonnet-5` or `anthropic.claude-haiku-4-5`. The models available to your account depend on what your organization has been g…