Provider changes/AnthropicANTHROPIC · VERIFIED CHANGE

Claude Opus 4.8 fast mode is deprecated and will be removed on November 30, 2026

Claude Opus 4.8 fast mode is deprecated and will be removed on November 30, 2026. Requests using speed: "fast" will then return an error; continued fast-mode use requires migration to Claude Opus 5.5.

Verified Oct 30, 20261 official source

Mentioned in the evidence

Claude Opus 4.8 fast mode
claude-opus-4-8 requests with speed: "fast"

Official source

Anthropic Claude release notes (changelog) ↗
We’ve deprecated fast mode for Claude Opus 4.8, with removal on November 30, 2026. After removal, requests to claude-opus-4-8 with speed: "fast" will return an error. To continue using fast mode, migrate to Claude Opus 5.5. Read more in Fast mode.

This is a global change, verified against Anthropic’s own sources. It is not an assessment of your systems or your impact.

A global change is not your impact.

Auterim checks your confirmed dependencies and can verify repository references when GitHub is connected.

Scan a company URL More Anthropic changesMore from this provider