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
812pages tracked
765 changed this week · last read 23 Oct 2026
Claude Code CLI
228pages tracked
147 changed this week · last read 23 Oct 2026
Claude Documentation
280pages tracked
77 changed this week · last read 23 Oct 2026
Model Context Protocol
357pages tracked
171 changed this week · last read 22 Oct 2026
100 on this page
9,955 of the ledger's changes in api. Show every change
ReadSourcePageWhatLines
21 Aug 2026
128 pages
+58103 −32296 lines
api
build-with-claude/structured-outputs
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build-with-claude/structured-outputs
**Migrating from beta?** The `output_format` parameter has moved to `output_config.format`, and beta headers are no longer required. The old beta header (`structured-outputs-2025
**Migrating from beta?** The `output_format` parameter has moved to `output_config.format`, and beta headers are no longer required. The API continues to accept the old beta head
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api
build-with-claude/skills-guide
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build-with-claude/skills-guide
// The PHP SDK supports container skills only through $client->beta->messages with the skills beta.
$message = $client->beta->messages->create(
$message = $client->messages->create(
betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
'skill_id' => 'pptx',
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api
build-with-claude/refusals-and-fallback
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build-with-claude/refusals-and-fallback
Default routing never draws the up-front [oversized-image rejection](https://platform.claude.com/docs/en/build-with-claude/vision-coordinates#oversized-image-error) for models you
Named fallback models count toward the [oversized-image check](https://platform.claude.com/docs/en/build-with-claude/vision-coordinates#oversized-image-error): a request whose imag
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api
build-with-claude/prompt-caching
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build-with-claude/prompt-caching
On Claude Fable 5, [Claude Mythos 5](https://anthropic.com/glasswing), Claude Opus 4.8, Claude Opus 5, and Claude Sonnet 5, you can add a new system instruction partway through a
On Claude Fable 5, [Claude Mythos 5](https://anthropic.com/glasswing), Claude Opus 4.8, and Claude Opus 5, you can add a new system instruction partway through a conversation wit
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api
build-with-claude/pdf-support
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build-with-claude/pdf-support
import httpx
import httpx2
httpx.get(pdf_url, follow_redirects=True).content
httpx2.get(pdf_url, follow_redirects=True).content
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
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api
build-with-claude/overview
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build-with-claude/overview
Features on the Claude Platform are assigned one of the following availability classifications per platform (shown in the Availability column of each following table). Not all feat
The Availability column in each of the following tables lists the platforms that offer a feature. A platform listed without a label offers the feature as stable, fully supported, a
| Classification | Description
| ---------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------
| **Beta** | Preview features used for gathering feedback and iterating on a less mature use case. Availability may be limited, including through sign-up requir
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api
build-with-claude/mid-conversation-system-messages
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build-with-claude/mid-conversation-system-messages
This page covers two features: mid-conversation system messages, which are generally available, and [mid-conversation tool changes](https://platform.claude.com/docs/en/build-with-c
This page covers two features: mid-conversation system messages, and [mid-conversation tool changes](https://platform.claude.com/docs/en/build-with-claude/mid-conversation-system-m
This feature is available on Claude Fable 5, [Claude Mythos 5](https://anthropic.com/glasswing), Claude Opus 4.8, Claude Opus 5, and Claude Sonnet 5. No beta header is required f
This feature is available on Claude Fable 5, [Claude Mythos 5](https://anthropic.com/glasswing), Claude Opus 4.8, and Claude Opus 5. No beta header is required for mid-conversati
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build-with-claude/handling-stop-reasons
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build-with-claude/handling-stop-reasons
RESPONSE=$(ant messages create --max-tokens 1024 \
--format jsonl < request.yaml)
RESPONSE=$(ant messages create --max-tokens 1024 --format jsonl < request.yaml)
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api
build-with-claude/files
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build-with-claude/files
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
$file = $client->beta->files->upload(
FileParam::fromResource(fopen('/path/to/document.pdf', 'rb'), contentType: 'application/pdf'),
$file = $client->files->upload(
file: FileParam::fromResource(fopen('/path/to/document.pdf', 'rb'), contentType: 'application/pdf'),
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build-with-claude/fast-mode
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build-with-claude/fast-mode
Fast mode for Claude Opus 5 and Claude Opus 4.8 is available as a research preview on the Claude API, including [Claude Managed Agents](https://platform.claude.com/docs/en/manage
Fast mode for Claude Opus 5 and Claude Opus 4.8 is available as a research preview on the Claude API, including [Claude Managed Agents](https://platform.claude.com/docs/en/manage
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build-with-claude/embeddings
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build-with-claude/embeddings
>
> * When `input_type="document"`, a query like "Apple's conference call to discuss fourth fiscal quarter results and business updates is scheduled for Thursday, November 2, 2
> * When `input_type="document"`, a query like "Apple's conference call to discuss fourth fiscal quarter results and business updates is scheduled for Thursday, November 2, 2
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api
build-with-claude/context-editing
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build-with-claude/context-editing
| Approach | Where it runs | Strategies | How it works
| --------------- | ------------- | ----------------------------------------------------------------------------------------------------- | ----------------------------------------
| **Server-side** | API | Tool result clearing (`clear_tool_uses_20250919`) Thinking block clearing (`clear_thinking_20251015`) | Applied before the prompt reaches Claude
| **Client-side** | SDK | Compaction | Available in [Python, TypeScript, and Ru
| Approach | Where it runs | Strategies | How it works
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build-with-claude/compaction
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build-with-claude/compaction
ant beta:messages create \
--beta compact-2026-01-12 \
--format jsonl <<'YAML'
ant beta:messages create --beta compact-2026-01-12 --format jsonl <<'YAML'
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build-with-claude/claude-platform-on-aws
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build-with-claude/claude-platform-on-aws
The client reads `AWS_REGION` from the environment if `aws_region`/`awsRegion` is not passed to the constructor, falling back to `AWS_DEFAULT_REGION` for compatibility with the sta
The client reads `AWS_REGION` from the environment if `aws_region`/`awsRegion` is not passed to the constructor, falling back to `AWS_DEFAULT_REGION` for compatibility with the sta
| Claude Opus 5 | claude-opus-5 |
The Start, Build, and Scale usage tiers each carry a monthly spend cap; see the [per-tier spend caps](https://platform.claude.com/docs/en/api/rate-limits#spend-limits) for current
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build-with-claude/claude-on-amazon-bedrock-legacy
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build-with-claude/claude-on-amazon-bedrock-legacy
# aws_region changes the aws region to which the request is made. By default, the SDK reads AWS_REGION,
# and if that's not present, defaults to us-east-1. Note that the SDK does not read ~/.aws/config for the region.
# aws_region changes the aws region to which the request is made. If it is not provided, the SDK reads
# AWS_REGION / AWS_DEFAULT_REGION, then the region configured for your boto3 session or AWS profile
# (including ~/.aws/config), and raises ValueError if no region can be resolved.
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api
build-with-claude/citations
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build-with-claude/citations
ant messages create \
--model claude-opus-5 \
--max-tokens 1024 <<'YAML'
ant messages create --model claude-opus-5 --max-tokens 1024 <<'YAML'
// The PHP SDK supports file_id document and image sources only through $client->beta->messages with the files beta.
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build-with-claude/cache-diagnostics
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build-with-claude/cache-diagnostics
--header "x-api-key: $ANTHROPIC_API_KEY" \
--header "anthropic-version: 2023-06-01" \
--header "anthropic-beta: cache-diagnosis-2026-04-07" \
--header "content-type: application/json" \
--data '{
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api
api/service-tiers
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api/service-tiers
ant messages create \
--transform usage.service_tier \
--raw-output <<'YAML'
ant messages create --transform usage.service_tier --raw-output <<'YAML'
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api
api/rate-limits
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api/rate-limits
Once you reach your tier's spend cap, API usage pauses until 00UTC on the first day of the next month, unless you request a higher limit sooner. While usage is paused, API requests
Once you reach your tier's spend cap, API usage pauses until 00:00 UTC on the first day of the next month, unless you request a higher limit sooner. While usage is paused, API requ
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api
api/overview
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api/overview
**General Availability:**
**Beta:**
The following APIs are in beta:
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api/messages/create
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api/messages/create
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
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api/messages/batches/results
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api/messages/batches/results
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
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api/messages/batches
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api/messages/batches
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
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api/messages
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api/messages
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
The resolved version: a skill version ID for custom skills.
### Container Params
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api
api/beta/sessions/update
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api/beta/sessions/update
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api
api/beta/sessions/threads/retrieve
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api/beta/sessions/threads/retrieve
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads/list
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api/beta/sessions/threads/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads/events/stream
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api/beta/sessions/threads/events/stream
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads/events/list
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api/beta/sessions/threads/events/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads/events
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api/beta/sessions/threads/events
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads/archive
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api/beta/sessions/threads/archive
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/threads
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api/beta/sessions/threads
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api/beta/sessions/retrieve
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api/beta/sessions/retrieve
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/events/stream
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api/beta/sessions/events/stream
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/events/list
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api/beta/sessions/events/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions/events
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api/beta/sessions/events
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api/beta/sessions/create
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api/beta/sessions/create
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api/beta/sessions/archive
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api/beta/sessions/archive
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/sessions
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api/beta/sessions
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api/beta/messages/create
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api/beta/messages/create
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
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api/beta/messages/batches/results
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api/beta/messages/batches/results
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
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api/beta/messages/batches
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api/beta/messages/batches
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
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api
api/beta/messages
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api/beta/messages
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
The resolved version: a skill version ID for custom skills.
Skill version or 'latest' for most recent version
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api/beta/agents/versions/list
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api/beta/agents/versions/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/agents/versions
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api/beta/agents/versions
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/agents/update
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api/beta/agents/update
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api/beta/agents/retrieve
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api/beta/agents/retrieve
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/agents/list
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api/beta/agents/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/agents/create
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api/beta/agents/create
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api
api/beta/agents/archive
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api/beta/agents/archive
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api/beta/agents
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api/beta/agents
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
- `"bash"`
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api/beta-headers
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api/beta-headers
description: Access experimental features before general availability with the `anthropic-beta` header or the SDKs' `betas` parameter.
description: Access experimental features before they become part of the standard API with the `anthropic-beta` header or the SDKs' `betas` parameter.
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api/beta
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api/beta
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api/admin/analytics/users/list
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api/admin/analytics/users/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/users
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api/admin/analytics/users
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/usage/list_by_user
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api/admin/analytics/usage/list_by_user
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/usage/list
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api/admin/analytics/usage/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/usage
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api/admin/analytics/usage
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/skills/list
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api/admin/analytics/skills/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/skills
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api/admin/analytics/skills
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/retrieve_summaries
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api/admin/analytics/retrieve_summaries
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/plugins/list
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api/admin/analytics/plugins/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/plugins
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api/admin/analytics/plugins
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/cost/list_by_user
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api/admin/analytics/cost/list_by_user
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/cost/list
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api/admin/analytics/cost/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/cost
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api/admin/analytics/cost
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api/admin/analytics/connectors/list
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api/admin/analytics/connectors/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/connectors
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api/admin/analytics/connectors
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/chat_projects/list
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api/admin/analytics/chat_projects/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/artifacts/list
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apichanged
api/admin/analytics/artifacts/list
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics/artifacts
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apichanged
api/admin/analytics/artifacts
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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api
api/admin/analytics
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api/admin/analytics
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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api
api/admin
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api/admin
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
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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
Tool search is generally available on the Claude API. For supported models, see [Model compatibility](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool
For the models that support tool search, see [Model compatibility](https://platform.claude.com/docs/en/agents-and-tools/tool-use/tool-search-tool#model-compatibility).
--header "x-api-key: $ANTHROPIC_API_KEY" \
--header "anthropic-version: 2023-06-01" \
--header "content-type: application/json" \
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api
agents-and-tools/tool-use/tool-runner
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agents-and-tools/tool-use/tool-runner
For long-running agentic tasks, the Python, TypeScript, and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#c
For long-running agentic tasks, the TypeScript and Ruby tool runners support automatic [compaction](https://platform.claude.com/docs/en/build-with-claude/context-editing#client-sid
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api
agents-and-tools/tool-use/tool-reference
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agents-and-tools/tool-use/tool-reference
| Tool | `type`
| -------------------------------------------------------------------------------------------------------- | -----------------------------------------------------------------------
| [Web search tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool) | `web_search_20260318` `web_search_20260209` `web_search_20250305`
| [Web fetch tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool) | `web_fetch_20260318` `web_fetch_20260309` `web_fetch_20260209` `web_fet
| [Code execution tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool) | `code_execution_20260521` `code_execution_20260120` `code_execution_202
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api
agents-and-tools/tool-use/memory-tool
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agents-and-tools/tool-use/memory-tool
The memory tool is generally available on the Messages API: no beta header is required. Using it takes two steps:
Using the memory tool takes two steps:
Four SDKs provide memory tool helpers that handle the tool interface and the loop. Subclass `BetaAbstractMemoryTool` (Python and C#), use `betaMemoryTool` (TypeScript), or implemen
Four SDKs provide memory tool helpers that handle the tool interface and the loop. Subclass `BetaAbstractMemoryTool` (Python and C#), use `betaMemoryTool` (TypeScript), or implemen
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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
Computer use is generally available on the Claude API as the `computer_toolset_20260801` toolset, with no beta header; see [Compatibility](https://platform.claude.com/docs/en/age
Computer use is available on the Claude API as the `computer_toolset_20260801` toolset, with no beta header; see [Compatibility](https://platform.claude.com/docs/en/agents-and-to
// Read toolset_name through array access: the SDK keeps it as raw data until a release types it.
if (!($block instanceof ToolUseBlock) || ($block['toolsetName'] ?? $block['toolset_name'] ?? null) !== 'computer') {
if (!($block instanceof ToolUseBlock) || $block->toolsetName !== 'computer') {
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api
agents-and-tools/tool-use/code-execution-tool
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agents-and-tools/tool-use/code-execution-tool
All three tool versions are generally available and don't require an `anthropic-beta` header. The legacy code execution beta headers remain valid opt-ins.
None of the three tool versions requires an `anthropic-beta` header. The legacy code execution beta headers remain valid opt-ins.
FILE_ID=$(ant files upload \
--file ./data.csv \
--transform id --raw-output)
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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
The browser use tool is generally available on the Claude API with no beta header: add one entry of type `browser_toolset_20260801`, with no `name`, to the `tools` array of a [Mess
The browser use tool is available on the Claude API with no beta header: add one entry of type `browser_toolset_20260801`, with no `name`, to the `tools` array of a [Messages API](
// Read toolset_name through array access: the SDK keeps it as raw data until a release types it.
if (!($block instanceof ToolUseBlock) || ($block['toolsetName'] ?? $block['toolset_name'] ?? null) !== 'browser') {
if (!($block instanceof ToolUseBlock) || $block->toolsetName !== 'browser') {
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api
agents-and-tools/mcp-connector
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agents-and-tools/mcp-connector
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
$file = $anthropic->beta->files->upload(file: BetaMcp::resourceToFile($fileResource));
$file = $anthropic->files->upload(file: BetaMcp::resourceToFile($fileResource));
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api
agents-and-tools/agent-skills/quickstart
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agents-and-tools/agent-skills/quickstart
// The PHP SDK exposes the Skills API under the beta namespace; field names can differ from other SDKs.
$skills = $client->beta->skills->list(source: 'anthropic');
foreach ($skills->data as $skill) {
echo "{$skill->id}: {$skill->displayTitle}\n";
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api
agents-and-tools/agent-skills/claude-api-skill
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agents-and-tools/agent-skills/claude-api-skill
* **Beta header cleanup**, removing headers that are GA on the target model (for example, `effort-2025-11-24`, `fine-grained-tool-streaming-2025-05-14`, `interleaved-thinking-2025-
* **Beta header cleanup**, removing beta headers that the target model doesn't require (for example, `effort-2025-11-24`, `fine-grained-tool-streaming-2025-05-14`, `interleaved-thi
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api
about-claude/use-case-guides/ticket-routing
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about-claude/use-case-guides/ticket-routing
temperature=0,
temperature=0,
 by default (1M tokens is both the default and the maxi
Claude Sonnet 5 supports the [1M token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows) by default (1M tokens is both the default and the maxi
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api
about-claude/models/whats-new-opus-5
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about-claude/models/whats-new-opus-5
[Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) (research preview) is available for Claude Opus 5 on the Claude API only; it is not currently available
[Fast mode](https://platform.claude.com/docs/en/build-with-claude/fast-mode) (research preview) is available for Claude Opus 5 on the Claude API only; it is not currently available
On Claude Opus 5, `thinking: {"type": "disabled"}` is accepted only when the effort level is `high` or below. Setting `thinking: {"type": "disabled"}` with effort `xhigh` or `max`
On Claude Opus 5, `thinking: {"type": "disabled"}` is accepted only when the effort level is `high` or below. Setting `thinking: {"type": "disabled"}` with effort `xhigh` or `max`
* **AWS:** available through [Claude in Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), as `anthropic.claude-opus-5`. Claude Opus 5
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api
about-claude/models/overview
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about-claude/models/overview
Claude Fable 5 is generally available on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry beginning June 9, 2026. Claude Mythos 5 is not
Claude Fable 5 is available on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry beginning June 9, 2026. Claude Mythos 5 is offered only t
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api
about-claude/models/optimizing-for-cost-and-intelligence
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about-claude/models/optimizing-for-cost-and-intelligence
Three settings can break your cache during a task. Changing [`effort`](https://platform.claude.com/docs/en/build-with-claude/effort) between requests invalidates the cached prefix,
Four things can break your cache during a task. Anything that changes per request, such as a timestamp or a queue position, placed ahead of the stable prefix turns every request in
* **Input trimming.** [Dynamic filtering](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool#dynamic-filtering) in the web fetch tool keeps boilerplate ou
* **Input trimming.** [Dynamic filtering](https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-fetch-tool#dynamic-filtering) in the web fetch tool keeps boilerplate ou
The levers interact with the cache and each other, so judge them by net effect, and use [cache diagnostics](https://platform.claude.com/docs/en/build-with-claude/cache-diagnostics)
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api
about-claude/models/migration-guide
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about-claude/models/migration-guide
[Claude Fable 5](https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5) is Anthropic's most capable widely released model, generall
[Claude Fable 5](https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5) is Anthropic's most capable widely released model, availabl
* **Availability:** Claude Fable 5 is generally available. Claude Mythos 5 is available only to approved customers in [Project Glasswing](https://anthropic.com/glasswing).
* **Availability:** Claude Fable 5 does not require access approval. Claude Mythos 5 is available only to approved customers in [Project Glasswing](https://anthropic.com/glasswing)
[Claude Mythos 5](https://anthropic.com/glasswing) is the access-gated successor to [Claude Mythos Preview](https://anthropic.com/glasswing), the invitation-only research preview.
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api
about-claude/models/introducing-claude-fable-5-and-claude-mythos-5
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about-claude/models/introducing-claude-fable-5-and-claude-mythos-5
* **Claude Fable 5** is generally available on the Claude API, [Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Claude Platform on
* **Claude Mythos 5** is not generally available: it is offered in limited availability to approved customers in [Project Glasswing](https://anthropic.com/glasswing). For access, c
* **Claude Fable 5** is available on the Claude API, [Amazon Bedrock](https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock), [Claude Platform on AWS](http
* **Claude Mythos 5** is offered only to approved customers in [Project Glasswing](https://anthropic.com/glasswing). For access, contact your Anthropic, AWS, or Google Cloud accoun
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about-claude/model-deprecations
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about-claude/model-deprecations
Anthropic occasionally deprecates request parameters that no longer apply to current models. Deprecated parameters remain in the SDK request types so existing code continues to typ
Anthropic occasionally deprecates request parameters that no longer apply to current models. How the API treats a deprecated parameter depends on the model, as the following table
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api
managed-agents/skills
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managed-agents/skills
ant skills create \
--file example_skill.zip
ant skills create --file example_skill.zip
// The PHP SDK exposes the Skills API under the beta namespace; field names can differ from other SDKs.
$skill = $client->beta->skills->create(
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managed-agents/self-hosted-sandboxes
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managed-agents/self-hosted-sandboxes
ant beta:worker poll \
--workdir "/workspace"
ant beta:worker poll --workdir "/workspace"
ant beta:worker poll \
--on-work ./spawn.sh
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api
manage-claude/app-attest
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manage-claude/app-attest
Apps use App Attest through the [Claude for Foundation Models](https://github.com/anthropics/ClaudeForFoundationModels) Swift package, which is in beta: it requires the OS 27 betas
Apps use App Attest through the [Claude for Foundation Models](https://github.com/anthropics/ClaudeForFoundationModels) Swift package, which is in beta: it requires the OS 27 betas
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api/beta/sessions/list
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api/beta/sessions/list
- `enabled: boolean`
- `name: "bash" or "edit" or "read" or 5 more`
Built-in agent tool identifier.
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api
api/admin/analytics/chat_projects
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api/admin/analytics/chat_projects
-H "Authorization: Bearer $ANTHROPIC_OAUTH_TOKEN"
-H "X-Api-Key: $ANTHROPIC_ADMIN_API_KEY"
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20 Aug 2026
249 pages
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api
release-notes/overview
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release-notes/overview
* The [computer use tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/computer-use-tool) is now generally available on the Claude API as the `computer_toolset_202
* We've launched the [browser use tool](https://platform.claude.com/docs/en/agents-and-tools/tool-use/browser-use-tool) (`browser_toolset_20260801`), a client toolset for driving a
* Both toolsets are available for Claude Fable 5, Claude Mythos 5, Claude Opus 5, Claude Sonnet 5, and Claude Opus 4.8 on the Claude API.
- You can now restrict which sites a Claude Managed Agents agent's `web_search` and `web_fetch` tools can reach. Set `allowed_domains` or `blocked_domains` on the tool's entry in t
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api
managed-agents/skills
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managed-agents/skills
The Skills API doesn't require a beta header. Requests that still send `anthropic-beta: skills-2025-10-02` keep working and return the earlier response fields.
<?php
// The PHP SDK exposes the Skills API under the beta namespace; field names can differ from other SDKs.
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managed-agents/files
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managed-agents/files
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
Use the [Files API](https://platform.claude.com/docs/en/build-with-claude/files) to list files scoped to a session and download them. Filtering by `scope_id` requires the `managed-
Use the [Files API](https://platform.claude.com/docs/en/build-with-claude/files) to list files scoped to a session and download them. Filtering by `scope_id` requires the `managed-
// The PHP SDK exposes the Files API under the beta namespace; field names can differ from other SDKs.
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