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Claude Opus 5.5 Migration: Four Errors You'll See and Three You Won't

This story is from 2026-09-23. It is preserved in the archive; the latest stories are on the live feed.

Anthropic released Claude Opus 5.5 on 22 September 2026. It costs less than Opus 5 ($4/$20 per million input/output tokens, down from $5/$25), cache reads dropped from $0.50 to $0.20, and in Anthropic's own benchmark table it beats Claude Fable 5.1 on agentic coding at 40% of Fable's list price. Mo…

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  1. 2026-09-23 14:37 · DEV Community — AI
    Claude Opus 5.5 Migration: Four Errors You'll See and Three You Won't

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