Anthropic's Models API now reports whether each model supports thinking type "between_tools", which disables up-front thinking. The Compliance API can now return organization members' saved Instructions from claude.ai and Cowork via a new beta endpoint. Fast mode for Claude Opus 5.5 is generally available: the fast-mode-2026-02-01 beta header is no longer required (though still works), default fast mode rate limits apply in Start, Build, and Scale tiers, and it's available on Claude in Microsoft Foundry on Azure; fast mode for Claude Opus 5 and 4.8 remains in research preview and still needs…
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What to doRemove the fast-mode-2026-02-01 beta header from Claude Opus 5.5 fast mode requests if you no longer need it, and check the Models API for between_tools thinking support.
- Provider
- Anthropic
- Source
- platform.claude.com