HomeDocs changes
Documentation changes
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
767 changed this week · last read 24 Oct 2026
Claude Code CLI
228pages tracked
146 changed this week · last read 24 Oct 2026
Claude Documentation
280pages tracked
69 changed this week · last read 24 Oct 2026
Model Context Protocol
357pages tracked
171 changed this week · last read 23 Oct 2026
100 on this page
ReadSourcePageWhatLines
9 Oct 2026
658 pages
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api
api/beta/models
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api/beta/models
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/messages/create
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api/beta/messages/create
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/messages/count_tokens
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api/beta/messages/count_tokens
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/messages/batches/retrieve
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api/beta/messages/batches/retrieve
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/messages/batches/results
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api/beta/messages/batches/results
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/messages/batches/list
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api/beta/messages/batches/list
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/messages/batches/delete
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api/beta/messages/batches/delete
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/messages/batches/create
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api/beta/messages/batches/create
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/messages/batches/cancel
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api/beta/messages/batches/cancel
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/messages/batches
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api/beta/messages/batches
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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api/beta/messages
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api/beta/messages
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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api/beta/memory_stores/update
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- `"anthropic-version": optional string`
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api/beta/memory_stores/retrieve
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api/beta/memory_stores/retrieve
- `"anthropic-version": optional string`
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api/beta/memory_stores/memory_versions/retrieve
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api/beta/memory_stores/memory_versions/retrieve
- `"anthropic-version": optional string`
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api/beta/memory_stores/memory_versions/redact
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api/beta/memory_stores/memory_versions/redact
- `"anthropic-version": optional string`
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api/beta/memory_stores/memory_versions/list
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api/beta/memory_stores/memory_versions/list
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api/beta/memory_stores/memory_versions
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api/beta/memory_stores/memory_versions
- `"anthropic-version": optional string`
- `"anthropic-version": optional string`
- `"anthropic-version": optional string`
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api/beta/memory_stores/memories/update
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api/beta/memory_stores/memories/update
- `"anthropic-version": optional string`
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api/beta/memory_stores/memories/retrieve
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api/beta/memory_stores/memories/retrieve
- `"anthropic-version": optional string`
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- `"anthropic-version": optional string`
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api/beta/memory_stores/memories/delete
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api/beta/memory_stores/memories/delete
- `"anthropic-version": optional string`
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api/beta/memory_stores/memories/create
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api/beta/memory_stores/memories/create
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api/beta/memory_stores/memories
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api/beta/memory_stores/memories
- `"anthropic-version": optional string`
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api/beta/memory_stores/list
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- `"anthropic-version": optional string`
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api/beta/memory_stores/create
- `"anthropic-version": optional string`
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- `"anthropic-version": optional string`
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api/beta/memory_stores
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api/beta/memory_stores
- `"anthropic-version": optional string`
- `"anthropic-version": optional string`
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api/beta/files/upload
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api/beta/files/upload
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/files/retrieve_metadata
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api/beta/files/retrieve_metadata
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/files/list
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api/beta/files/list
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/files/download
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api/beta/files/download
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/files/delete
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api/beta/files/delete
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/files
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api/beta/files
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/environments/work/update
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api/beta/environments/work/update
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/environments/work/stop
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api/beta/environments/work/stop
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/environments/work/stats
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api/beta/environments/work/stats
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/environments/work/retrieve
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api/beta/environments/work/retrieve
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/environments/work/poll
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api/beta/environments/work/poll
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/environments/work/list
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api/beta/environments/work/list
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments/work/heartbeat
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api/beta/environments/work/heartbeat
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api/beta/environments/work/ack
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api/beta/environments/work/ack
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments/work
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api/beta/environments/work
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments/update
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api/beta/environments/update
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments/retrieve
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api/beta/environments/retrieve
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments/list
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api/beta/environments/list
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments/delete
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api/beta/environments/delete
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments/create
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api/beta/environments/create
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments/archive
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api/beta/environments/archive
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/environments
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api/beta/environments
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
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api
api/beta/dreams/retrieve
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api/beta/dreams/retrieve
- `"anthropic-version": optional string`
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api/beta/dreams/list
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api/beta/dreams/list
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api/beta/dreams/create
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api/beta/dreams/create
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api/beta/dreams/cancel
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api/beta/dreams/cancel
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api/beta/dreams/archive
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api/beta/dreams/archive
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api/beta/dreams
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api/beta/dreams
- `"anthropic-version": optional string`
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api
api/beta/deployments/update
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api/beta/deployments/update
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api/beta/deployments/unpause
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api/beta/deployments/unpause
- `"anthropic-version": optional string`
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api/beta/deployments/run
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api/beta/deployments/run
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api/beta/deployments/pause
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api/beta/deployments/pause
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api/beta/deployments/create
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api/beta/deployments/create
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api/beta/deployments/archive
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api/beta/deployments/archive
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api
api/beta/deployments
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api/beta/deployments
- `"anthropic-version": optional string`
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api
api/beta/deployment_runs/retrieve
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api/beta/deployment_runs/retrieve
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api/beta/deployment_runs/list
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api/beta/deployment_runs/list
- `"anthropic-version": optional string`
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api/beta/deployment_runs
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api/beta/deployment_runs
- `"anthropic-version": optional string`
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api/beta/agents/versions/list
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api/beta/agents/versions/list
- `"anthropic-version": optional string`
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api/beta/agents/versions
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api/beta/agents/versions
- `"anthropic-version": optional string`
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api
api/beta/agents/update
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api/beta/agents/update
- `"anthropic-version": optional string`
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api/beta/agents/retrieve
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api/beta/agents/retrieve
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api
api/beta/agents/list
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api/beta/agents/list
- `"anthropic-version": optional string`
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api
api/beta/agents/create
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api/beta/agents/create
- `"anthropic-version": optional string`
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api
api/beta/agents/archive
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api/beta/agents/archive
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api/beta/agents
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api/beta/agents
- `"anthropic-version": optional string`
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api
api/beta
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api/beta
- `"anthropic-version": optional string`
The version of the Claude API you want to use.
Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
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api
agents-and-tools/tool-use/troubleshooting-tool-use
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agents-and-tools/tool-use/troubleshooting-tool-use
## JSON escaping differences (Opus 4.6+)
## JSON escaping differences between model versions
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api
agents-and-tools/tool-use/tool-search-tool
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agents-and-tools/tool-use/tool-search-tool
| Claude Sonnet 5 (claude-sonnet-5) | `tool_search_tool_regex_20251119`, `tool_sear
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api
agents-and-tools/tool-use/text-editor-tool
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agents-and-tools/tool-use/text-editor-tool
| Tool | Additional input tokens |
| ----------------------------------- | ----------------------- |
| `text_editor_20250429` (Claude 4.x) | 700 tokens |
| Tool | Additional input tokens |
| ------------------------------------------------------------------------------ | ----------------------- |
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api
agents-and-tools/tool-use/programmatic-tool-calling
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agents-and-tools/tool-use/programmatic-tool-calling
Amazon Bedrock: not available
Google Cloud: not available
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api
agents-and-tools/tool-use/define-tools
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agents-and-tools/tool-use/define-tools
| Model or setting | Restriction
| --------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------
| Manual [extended thinking](https://platform.claude.com/docs/en/build-with-claude/extended-thinking) (`thinking: {type: "enabled"}`) | `any` and `tool` are not supported
| Claude Opus 5.5, Claude Sonnet 5.5, Claude Fable 5.1, and [Claude Mythos 5.1](https://platform.claude.com/docs/en/models/mythos-5-1/overview) | `any` and `tool` return a [400 err
| Model or setting | Restriction
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api
agents-and-tools/tool-use/computer-use-tool
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agents-and-tools/tool-use/computer-use-tool
- On the Claude API and Google Cloud, Claude 5.5 and later models support computer use only through the `computer_toolset_20260801` toolset and return an error for the earlier
- 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 the Claude API and Google Cloud, Claude 5.5 and later models support computer use only through the `computer_toolset_20260801` toolset and return an error for the earlier
- On Amazon Bedrock, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5 accept the earlier `computer_20251124` tool version as Claude Opus 5 and Claude Sonnet 5 do.
Upgrading from `computer_20251124` to the toolset is optional: the models listed for `computer_20251124` under [Earlier tool versions](https://platform.claude.com/docs/en/agents-an
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agents-and-tools/tool-use/code-execution-tool
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agents-and-tools/tool-use/code-execution-tool
Amazon Bedrock: not available
Google Cloud: not available
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api
agents-and-tools/tool-use/browser-use-tool
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agents-and-tools/tool-use/browser-use-tool
Claude Platform on AWS: not available
Amazon Bedrock: not available
Microsoft Foundry: not available
**Toolset definition overhead:** Declaring `browser_toolset_20260801` with its default members adds about 6,600 input tokens to a request (about 6,610 on Claude Fable 5, Claude Myt
**Toolset definition overhead:** Declaring `browser_toolset_20260801` with its default members adds about 6,600 input tokens to a request (about 6,670 on Claude Sonnet 5 and about
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api
agents-and-tools/tool-use/bash-tool
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agents-and-tools/tool-use/bash-tool
| Model | Additional input tokens |
| --------------------------------------------------- | ----------------------- |
| Claude Opus 5, Claude Opus 4.8, and Claude Opus 4.7 | 325 tokens |
| Claude Opus 4.6, Claude Sonnet 4.6, and earlier | 244 tokens |
| Model | Additional input tokens |
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api
agents-and-tools/tool-use/advisor-tool
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agents-and-tools/tool-use/advisor-tool
If a Haiku executor has not called the advisor in its first assistant turn, append a short reminder as an additional user message before the second assistant turn. In Anthropic's i
If a Haiku executor has not called the advisor in its first assistant turn, append a short reminder as an additional user message before the second assistant turn. In Anthropic's i
model="claude-haiku-4-5",
model="claude-haiku-5-5",
if response.stop_reason == "end_turn":
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api
agents-and-tools/mcp-connector
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agents-and-tools/mcp-connector
Amazon Bedrock: not available
Google Cloud: not available
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about-claude/pricing
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* **Google Cloud** offers three endpoint types: global endpoints, multi-region endpoints (dynamic routing within a geographic area), and regional endpoints.
* **Google Cloud** offers global endpoints and multi-region endpoints (dynamic routing within a geographic area) for these models, and regional endpoints for Claude Sonnet 4.6 an
For Claude 4.6 and later models, specifying US-only inference through the `inference_geo` parameter incurs a 1.1x multiplier on all token pricing categories, including input tokens
For Claude 4.6 and later models, specifying US-only inference through the `inference_geo` parameter incurs a 1.1x multiplier on all token pricing categories, including input tokens
| Model | Additional input tokens |
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The cache is a byte-exact prefix match over the request in order (tools, then system prompt, then messages), so a change anywhere invalidates everything after it. Changing [`effort
The cache is a byte-exact prefix match over the request in order (tools, then system prompt, then messages), so a change anywhere invalidates everything after it. Changing [`effort
Compare on cost per solved task, not per token: the same text costs about 30% more tokens on Claude Opus 4.7 and later, so a per-token comparison makes the newer models look more e
Compare on cost per solved task, not per token: the same text costs about 30% more tokens on Claude 4.7 and later models, so a per-token comparison makes the newer models look more
1. Pull a few tasks from production logs, weighted like real traffic, and [write outcome checks](https://platform.claude.com/docs/en/test-and-evaluate/develop-tests) for each: test
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* **Effort:** Several Claude models support an [effort parameter](https://platform.claude.com/docs/en/build-with-claude/effort) that trades intelligence for latency and cost within
* **Effort:** Several Claude models support an [effort parameter](https://platform.claude.com/docs/en/build-with-claude/effort) that trades intelligence for latency and cost within
<Card title="What's new in Claude Haiku 5.5" icon="sparkle" href="https://platform.claude.com/docs/en/models/haiku-5-5/whats-new-haiku-5-5">
The latest Haiku model: breaking changes, new features, and behavior differences
</Card>
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| June 15, 2026 | `claude-sonnet-4-20250514` | `claude-sonnet-4-6` |
| June 15, 2026 | `claude-sonnet-4-20250514` | `claude-sonnet-5-5` |
| February 19, 2026 | `claude-3-7-sonnet-20250219` | `claude-sonnet-4-6` |
| February 19, 2026 | `claude-3-7-sonnet-20250219` | `claude-sonnet-5-5` |
| October 28, 2025 | `claude-3-5-sonnet-20240620` | `claude-sonnet-4-6` |
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Tokens are the smallest individual units of a language model, and can correspond to words, subwords, characters, or even bytes (in the case of Unicode). For Claude, a token approxi
Tokens are the smallest individual units of a language model, and can correspond to words, subwords, characters, or even bytes (in the case of Unicode). For Claude, the number of c
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| Microsoft Foundry inference provider | Set `inferenceFoundryAuthFlow` to `broker` | [Microsoft Foundry](/docs/third-party/claude-desktop/foundry.md#in-app-entra-id-sign-in) |
| LLM gateway single sign-on | Set `inferenceGatewayOidcAuthFlow` to `broker` | [LLM gateway](/docs/third-party/claude-desktop/gateway.md#single-sign-on-configuration-keys) |
| Workforce Identity sign-in for Google Cloud's Agent Platform | Set `inferenceVertexWorkforceAuthFlow` to `broker` | [Google Cloud's Agent Platform](/docs/third-party/claude-deskt
| Amazon Bedrock identity provider sign-in (through a proxy) | Set `inferenceIdpAuthFlow` to `broker` | [Amazon Bedrock](/docs/third-party/claude-desktop/bedrock.md#sign-in-with-yo
| Managed MCP server | Set `authFlow` to `broker` in the entry's `oauth` object | [Managed MCP servers](/docs/third-party/claude-desktop/extensions.md#managed-mcp-servers-admin) |
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Amazon Bedrock Mantle is Amazon Bedrock's Anthropic-native API surface. Unlike the standard [Amazon Bedrock provider](/docs/third-party/claude-desktop/bedrock), Mantle speaks the A
Amazon Bedrock Mantle is Amazon Bedrock's Anthropic-native API surface. Unlike the standard [Amazon Bedrock provider](/docs/third-party/claude-desktop/bedrock.md), Mantle speaks th
Mantle supports a bearer token only. There is no in-app AWS sign-in or named-profile support for this provider; if you need per-user IAM Identity Center authentication, use the sta
Mantle supports a bearer token only. There is no in-app AWS sign-in or named-profile support for this provider; if you need per-user IAM Identity Center authentication, use the sta
| Token must not be stored statically | [Credential helper](/docs/third-party/claude-desktop/configuration#inferencecredentialhelper) (`inferenceCredentialHelper`) | An executable
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| Your organization already has tooling that obtains a Microsoft Foundry credential | [Credential helper](/docs/third-party/claude-desktop/configuration#inferencecredentialhelper)
| Your organization already has tooling that obtains a Microsoft Foundry credential | [Credential helper](/docs/third-party/claude-desktop/configuration.md#inferencecredentialhelpe
* For the broker flow (`inferenceFoundryAuthFlow` set to `broker`), enable **Allow public client flows** and add the platform's broker redirect URI under **Mobile and desktop app
* For the broker flow (`inferenceFoundryAuthFlow` set to `broker`), enable **Allow public client flows** and add the platform's broker redirect URI under **Mobile and desktop app
The device-code and browser flows need no per-device preparation. The broker flow signs in through the operating system's native Microsoft identity broker, so each device must meet
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| Microsoft Foundry inference provider | Set `inferenceFoundryAuthFlow` to `broker` | [Microsoft Foundry](/docs/third-party/claude-desktop/foundry#in-app-entra-id-sign-in) |
| LLM gateway single sign-on | Set `inferenceGatewayOidcAuthFlow` to `broker` | [LLM gateway](/docs/third-party/claude-desktop/gateway#single-sign-on-configuration-keys) |
| Workforce Identity sign-in for Google Cloud's Agent Platform | Set `inferenceVertexWorkforceAuthFlow` to `broker` | [Google Cloud's Agent Platform](/docs/third-party/claude-deskt
| Amazon Bedrock identity provider sign-in (through a proxy) | Set `inferenceIdpAuthFlow` to `broker` | [Amazon Bedrock](/docs/third-party/claude-desktop/bedrock#sign-in-with-your-
| Managed MCP server | Set `authFlow` to `broker` in the entry's `oauth` object | [Managed MCP servers](/docs/third-party/claude-desktop/extensions#managed-mcp-servers-admin) |
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In the Claude Desktop [in-app configuration window](/docs/third-party/claude-desktop/in-app-configuration), open **Connectors**, select **Add server → Microsoft 365**, and enter th
In the Claude Desktop [in-app configuration window](/docs/third-party/claude-desktop/in-app-configuration.md), open **Connectors**, select **Add server → Microsoft 365**, and enter
In addition to the [base egress hosts](/docs/third-party/claude-desktop/telemetry#required-egress-paths), Claude Desktop needs outbound HTTPS access to the hosts below. The connect
In addition to the [base egress hosts](/docs/third-party/claude-desktop/telemetry.md#required-egress-paths), Claude Desktop needs outbound HTTPS access to the hosts below. The conn
In the Claude Desktop [in-app configuration window](/docs/third-party/claude-desktop/in-app-configuration), open **Connectors**, select **Add server**, and choose **Microsoft 365**
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| You already operate an LLM gateway (Anthropic Messages API) | [Gateway provider](/docs/third-party/claude-desktop/gateway) instead of Amazon Bedrock | None | At your gateway | Th
| You already operate an LLM gateway (Anthropic Messages API) | [Gateway provider](/docs/third-party/claude-desktop/gateway.md) instead of Amazon Bedrock | None | At your gateway |
When more than one credential is configured, the app uses the first one present in this order: identity provider sign-in, in-app AWS sign-in, named profile, credential helper, bear
When more than one credential is configured, the app uses the first one present in this order: identity provider sign-in, in-app AWS sign-in, named profile, credential helper, bear
At the start of each Cowork or Code session, the app exchanges the stored token with IAM Identity Center for short-lived AWS credentials scoped to the configured account and permis
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| <span id="inferencebedrockregion" />AWS region<br />`inferenceBedrockRegion` | `string` | MDM + Bootstrap<br />Added in 1.2581.0 | — | AWS region for the Bedrock runtime endpoint
| <span id="inferencebedrockbaseurl" />Bedrock base URL<br />`inferenceBedrockBaseUrl` | `string` | MDM + Bootstrap<br />Added in 1.2581.0 | — | For VPC endpoints or gateway proxie
| <span id="inferencebedrockservicetier" />Bedrock service tier<br />`inferenceBedrockServiceTier` | `enum` | MDM + Bootstrap<br />Added in 1.5186.0 | — | Sent as the X-Amzn-Bedroc
| <span id="inferencebedrockbearertoken" />AWS bearer token<br />`inferenceBedrockBearerToken` | `string` | MDM + Bootstrap<br />Added in 1.2581.0 | — | Static bearer token for inf
| <span id="inferencebedrockssostarturl" />AWS SSO start URL<br />`inferenceBedrockSsoStartUrl` | `string` | MDM + Bootstrap<br />Added in 1.6259.0 | — | Enables in-app AWS sign-in
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