Claude API changelog & release notes

Claude API is Anthropic's Model / API. This page lists every Claude API release Patchwire has seen, newest first, collected from its official changelog page and refreshed daily. The latest update is  You can now let a Claude Managed Agents agent use dynamic workflows, in beta…, published Oct 9, 2026. There were 13 updates in the last 30 days. Each entry links to the original release notes.

All Anthropic tools → · Official source

Latest Claude API version

The latest Claude API update is  You can now let a Claude Managed Agents agent use dynamic workflows, in beta…, released Oct 9, 2026. Official release notes →

Friday, Oct 9

Claude APIAnthropic · Model / API

1 update

 You can now let a Claude Managed Agents agent use dynamic workflows, in beta with the…Copy link Post on X

Thursday, Oct 8

Claude APIAnthropic · Model / API

1 update

 The Compliance API chat endpoints now also return chats from the unified Claude experience, in beta for…Copy link Post on X

Wednesday, Oct 7

Claude APIAnthropic · Model / API

1 update

 We've lowered the price of prompt cache reads on Claude Sonnet 5.5 from $0.20 USD to $0.10 USD per million tokensCopy link Post on X

0.05x the base input price instead of 0.1x. Cache writes and all other prices are unchanged. See Prompt caching pricing. We've launched Claude Haiku 5.5 (claude-haiku-5-5), our…

Tuesday, Oct 6

Claude APIAnthropic · Model / API

1 update

 We've added capabilities.server_tools to the Models API. GET /v1/models and GET /v1/models/{model_id} now…Copy link Post on X

Monday, Oct 5

Claude APIAnthropic · Model / API

1 update

 We've added capabilities.thinking.types.disabled to the Models API. GET /v1/models and GET…Copy link Post on X

Thursday, Oct 1

Claude APIAnthropic · Model / API

1 update

 We've added a line field to the Models API. GET /v1/models and GET /v1/models/{model_id} now return the…Copy link Post on X

Wednesday, Sep 30

Claude APIAnthropic · Model / API

1 update

 In Python SDK 1.10.0, TypeScript SDK 0.130.0, C# SDK 12.52.0, Go SDK 1.77.0, Java SDK 2.67.0, PHP SDK…Copy link Post on X

Monday, Sep 28

Claude APIAnthropic · Model / API

1 update

 We've launched Claude Sonnet 5.5 (claude-sonnet-5-5). It's available on the Claude API, Claude in Amazon…Copy link Post on X

Thursday, Sep 24

Claude APIAnthropic · Model / API

1 update

 We're resuming billing for refusals that arrive before any output when stop_details.category is "bio",…Copy link Post on X

Wednesday, Sep 23

Claude APIAnthropic · Model / API

1 update

 Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07…Copy link Post on X

Tuesday, Sep 22

Claude APIAnthropic · Model / API

1 update

 We've launched Claude Opus 5.5 (claude-opus-5-5), a model for long-running agentic coding and knowledge…Copy link Post on X

Friday, Sep 18

Claude APIAnthropic · Model / API

1 update

 For cache diagnostics, a response to a request that sends the cache-diagnosis-2026-04-07 beta header now…Copy link Post on X

Monday, Sep 14

Claude APIAnthropic · Model / API

1 update

 The Messages API can now compact a conversation on demand on the Claude API, in beta with the…Copy link Post on X

Thursday, Sep 10

Claude APIAnthropic · Model / API

1 update

 Claude Managed Agents permission policies now include autoCopy link Post on X

the server evaluates each agent or MCP tool call and runs it, denies it, or pauses for your approval. agent.tool_use and agent.mcp_tool_use events report how each call was…

Wednesday, Sep 9

Claude APIAnthropic · Model / API

1 update

 For cache diagnostics, the API now stores a request's fingerprint only when the request includes the…Copy link Post on X

Thursday, Sep 3

Claude APIAnthropic · Model / API

1 update

 Version 1.30.0 of the ant CLI adds ant apply, which creates and updates agents, environments, skills,…Copy link Post on X

Tuesday, Sep 1

Claude APIAnthropic · Model / API

1 update

 We've launched Claude Fable 5.1 (claude-fable-5-1), the successor to Claude Fable 5 for long-running…Copy link Post on X

Thursday, Aug 27

Claude APIAnthropic · Model / API

1 update

 In Python SDK 1.2.0, TypeScript SDK 0.122.0, Go SDK 1.68.0, Java SDK 2.59.0, Ruby SDK 1.67.0, and C# SDK…Copy link Post on X

Wednesday, Aug 26

Claude APIAnthropic · Model / API

1 update

 The Compliance API session endpoints are out of beta for Cowork and Claude Code sessions. See Retrieve…Copy link Post on X

Thursday, Aug 20

Claude APIAnthropic · Model / API

1 update

 We've released v1.0 of the Python SDK. The SDK's HTTP layer moves from httpx to httpx2, a maintained,…Copy link Post on X

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