Claude Opus 5.5 fast mode needs no access request, but falling back costs the cache

T2Covered by 1 source · first reported by UploadVR / Road to VR / MIXED at 16 Oct, 23:37 UTC

Anthropic has taken fast mode out of research preview on Claude Opus 5.5, so asking for it no longer needs an access request or a beta header. The release notes dated October 15 say the model "now has a default fast mode rate limit in the Start, Build, and Scale usage tiers", and that requests…

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Sources

• T2Claude Opus 5.5 fast mode needs no access request, but falling back costs the cacheUploadVR / Road to VR / MIXED16 Oct, 23:37