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[ARTICLE · art-151439] src=byteiota.com ↗ pub= topic=large-language-models verified=true sentiment=· neutral

Claude Opus 5.5 Fast Mode Is Now GA: Remove That Beta Header

Anthropic's Claude Opus 5.5 fast mode exited research preview and became generally available on October 15, removing the waitlist and the beta header requirement. Developers using the fast mode must remove the beta header to migrate, and the mode carries a 2x price premium.

read1 min views1 publishedOct 16, 2026

Claude Opus 5.5 fast mode exited research preview on October 15. No more waitlist, no beta header. What changed, how to migrate, and when the 2x price is worth it.

The post Claude Opus 5.5 Fast Mode Is Now GA: Remove That Beta Header appeared first on byteiota .

source & further reading
byteiota.com — original article Mistral Large 4: The Only 1T Open-Weight Model — Oct 31 GitHub Agentic Autofix GA: Fix 25 Security Bugs at Once Meta Muse Spark Open: 816B Agent Model, One License Gotcha
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