Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 beta

Name: Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 beta
Start: 2026-09-23

Tech · Releases · Wed, September 23, 2026

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Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 beta header. Include the diagnostics object on a Messages request to opt in; requests that still send the header work as before.

Every year

Date	Event	When
Tue, Jun 30, 2026	Claude Sonnet 5 launches with a 1M token context window at $2 / $10 per MTok	3 mo ago
Thu, Jul 2, 2026	agent-memory-2026-07-22 beta header changes memory store listing behavior	3 mo ago
Fri, Jul 10, 2026	Dreams research preview adds Claude Fable 5 and Claude Sonnet 5	3 mo ago
Tue, Jul 14, 2026	Admin API adds Claude Enterprise user management in beta	2 mo ago
Wed, Jul 15, 2026	Mid-conversation system messages available on Claude Fable 5, Mythos 5 and Opus 4.8	2 mo ago
Wed, Jul 22, 2026	Claude Managed Agents agents accept an effort level in model configuration	2 mo ago
Fri, Jul 24, 2026	Claude Opus 5 launches with a 1M token context window at $5 / $25 per MTok	2 mo ago
Fri, Jul 24, 2026	Claude API fallbacks parameter adds a default mode for recommended fallbacks	2 mo ago
Fri, Jul 24, 2026	Mid-conversation tool changes enter beta on the Claude API	2 mo ago
Sat, Aug 1, 2026	Dreams research preview adds support for Claude Opus 5	2 mo ago
Mon, Aug 3, 2026	Compliance API returns cloud Cowork session transcripts in beta	2 mo ago
Wed, Aug 5, 2026	Inference hooks	2 mo ago
Fri, Aug 7, 2026	Claude Managed Agents sessions can consult an advisor model	2 mo ago
Wed, Aug 19, 2026	Agent Skills and the Skills API are out of beta on the Claude API	37 days ago
Wed, Aug 19, 2026	Claude Enterprise Admin API user-management endpoints are out of beta	37 days ago
Wed, Aug 19, 2026	Files API is out of beta on the Claude API	37 days ago
Wed, Aug 19, 2026	Claude computer use tool is out of beta as computer_toolset_20260801	37 days ago
Wed, Aug 19, 2026	Claude API launches browser_toolset_20260801 browser use tool	37 days ago
Wed, Aug 26, 2026	Admin API comes to the ant CLI and Claude SDKs under client.beta.organization	30 days ago
Wed, Aug 26, 2026	Compliance API adds Claude Science and Microsoft 365 session transcripts in beta	30 days ago
Tue, Sep 1, 2026	Claude Fable 5.1 launches alongside Claude Mythos 5.1 with 1M token context	24 days ago
Tue, Sep 1, 2026	Claude API adds turn-scoped system messages in beta	24 days ago
Tue, Sep 1, 2026	Claude API thinking.display adds an updates mode in beta	24 days ago
Tue, Sep 1, 2026	Per-message effort changes enter beta on the Claude API	24 days ago
Tue, Sep 1, 2026	Claude Fable 5.1 thinking blocks only replay to the same or newer models	24 days ago
Thu, Sep 3, 2026	Per-message effort changes beta expands to Claude on Google Cloud	22 days ago
Thu, Sep 10, 2026	ant CLI 1.32.0 adds sessions connect for live Managed Agents sessions	15 days ago
Mon, Sep 14, 2026	Claude API input_transformations adds thinking_mismatch_allowed entries in beta	11 days ago
Mon, Sep 14, 2026	Messages API adds on-demand conversation compaction in beta	11 days ago
Fri, Sep 18, 2026	Compliance API adds Claude in Chrome session transcripts in beta	7 days ago
Fri, Sep 18, 2026	For cache diagnostics, a response to a request that sends the cache-diagnosis-2026-04-07 beta header now	7 days ago
Tue, Sep 22, 2026	Claude Opus 5.5 launches with a 1M token context window and 128k output	3 days ago
Tue, Sep 22, 2026	Claude API beta lets tools be defined inside mid-conversation system messages	3 days ago
Tue, Sep 22, 2026	Fast mode research preview available for Claude Opus 5.5 on the Claude API	3 days ago
Wed, Sep 23, 2026	Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 beta	2 days ago

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anthropic

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2026-09-25: added to 2026-09-23

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