Breaking model

Claude Opus 4.1 retired on the Claude API; requests to it now fail

Took effect Aug 5, 2026 · model claude-opus-4-1-20250805

Reviewed against the vendor source on Sep 24, 2026 (AI-assisted review). Key facts are re-checked against the source daily.

What changes

Deprecated June 5, 2026 and retired August 5, 2026 on Anthropic-operated platforms (Claude API, Claude Platform on AWS, Microsoft Foundry). Bedrock and Google Cloud set their own schedules. Recommended replacement is claude-opus-4-8.

Breaking: Calls fail after this date.

What to do

Move the model id to config; switch to claude-opus-4-8; add a startup check that the configured model resolves.

Strings to search for

claude-opus-4-1-20250805claude-opus-4-1

Source

https://platform.claude.com/docs/en/about-claude/model-deprecations