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Claude Opus 5.5 fast mode leaves research preview—no waitlist or beta header

As of Oct 15, Claude Opus 5.5 fast mode is generally available on the Claude API: no access request or fast-mode-2026-02-01 beta header, with default fast-mode rate limits on Start, Build, and Scale tiers. It is also live on Claude in Microsoft Foundry for Azure-hosted deployments; Opus 5 and Opus 4.8 fast mode stay in research preview.

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