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Claude Opus 4.8 Fast Mode Is Retiring: A Safe Migration Playbook

A production migration guide for moving Claude Opus 4.8 fast-mode workloads to Opus 5.5 without hiding compatibility, latency, capacity, or cost regressions. Originally published on NoorYasser.com . This DEV edition is adapted for engineers planning the migration. Anthropic is removing fast mode fr…

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  1. 2026-11-01 17:53 · DEV Community — AI
    Claude Opus 4.8 Fast Mode Is Retiring: A Safe Migration Playbook

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