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Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family

This story is from 2026-09-22. It is preserved in the archive; the latest stories are on the live feed.

Opus 5.5 performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5. Opus 5.5 is our first release since we called for pacing the frontier. External evaluators, including Frontier Design and METR, tested it before release. On our most comprehensive alignment tes…

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  1. 2026-09-22 16:31 · r/ClaudeAI
    Introducing Claude Opus 5.5, the first model in our new Claude 5.5 family

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