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Claude Opus 5.5 Ships Cheaper, With Four Breaking Changes

This story is from 2026-09-24. It is preserved in the archive; the latest stories are on the live feed.

Anthropic released Claude Opus 5.5 on September 22, priced 20 percent lower than Opus 5 on both input and output tokens The model keeps the same 1M token context window and 128k max output as Opus 5, but the default effort level drops from high to medium Four breaking changes hit existing integrati…

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  1. 2026-09-24 01:00 · DEV Community — AI
    Claude Opus 5.5 Ships Cheaper, With Four Breaking Changes

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