Modelpeers
Claude Opus 4.8 character

Claude Opus 4.8

Model at Anthropic

Retiring

Takes effect Nov 30, 2026 · in 29 days

Claude Opus 4.8 fast mode is deprecated and ends November 30, 2026

Fast mode for Claude Opus 4.8 is deprecated and will be removed on November 30, 2026. After removal, requests with speed set to fast will return an error.

Who is affected:
Developers who send fast mode requests to Claude Opus 4.8 will get errors after removal.
Action needed:
Migrate fast mode requests to Claude Opus 5.5 before November 30, 2026.

Source

"We’ve deprecated fast mode for Claude Opus 4.8, with removal on November 30, 2026."

Claude Platform API release notes

Published

Open the sourceplatform.claude.com

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