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Anthropic deprecates fast mode for Claude Opus 4.8, pointing users to Opus 5.5
2026-10-30
Anthropic deprecated fast mode for Claude Opus 4.8 in the Claude API, with removal scheduled for November 30, 2026; after removal, requests to claude-opus-4-8 with speed: "fast" will return an error, and Anthropic directs users to migrate to Claude Opus 5.5.
Significance 2: A feature deprecation with a one-month migration window for the currently-picked coding-agent/daily-driver model is a routine API lifecycle change rather than a capability or pricing shift of the magnitude the rubric treats as notable on its own.
technology financial Pricing change
Sources
- primary Claude Platform release notes — fast mode deprecation for Claude Opus 4.8 retrieved 2026-11-01
Models
Affected axes
Output speed · Cost