# claude-sonnet-4-5-0

Calls to the model claude-sonnet-4-5-0 on Anthropic stop working on November 30, 2026.

- API: Anthropic (api.anthropic.com)
- Model: claude-sonnet-4-5-0
- Kind: Model retirement
- Announced: September 30, 2026
- Takes effect: November 30, 2026
- Calls after that day: fail
- Calls it hits: `model claude-sonnet-4-5-0`
- Source: [Deprecations page](https://platform.claude.com/docs/en/about-claude/model-deprecations)
- Page: https://www.okapi.bot/models/anthropic/claude-sonnet-4-5-0/

## What to use instead

Move to claude-sonnet-5-5, recommended by Anthropic.