# claude-opus-4-1

Calls to the model claude-opus-4-1 on Anthropic stopped working on August 5, 2026.

- API: Anthropic (api.anthropic.com)
- Model: claude-opus-4-1
- Kind: Model retirement
- Announced: June 5, 2026
- Takes effect: August 5, 2026
- Calls after that day: fail
- Calls it hits: `model claude-opus-4-1`
- Source: [Deprecations page](https://platform.claude.com/docs/en/about-claude/model-deprecations)
- Page: https://www.okapi.bot/models/anthropic/claude-opus-4-1/

## What to use instead

Move to claude-opus-4-8, recommended by Anthropic.