# claude-3-7-sonnet

Calls to the model claude-3-7-sonnet on Anthropic stopped working on February 19, 2026.

## The error Anthropic returns once claude-3-7-sonnet is gone

HTTP 404

```json
{"type":"error","error":{"type":"not_found_error","message":"model: claude-3-7-sonnet"}}
```

## What to use instead

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

- API: Anthropic (api.anthropic.com)
- Model: claude-3-7-sonnet
- Kind: Model retirement
- Announced: October 28, 2025
- Takes effect: February 19, 2026
- Calls after that day: fail
- Calls it hits: `model claude-3-7-sonnet`
- Source: [Deprecations page](https://platform.claude.com/docs/en/about-claude/model-deprecations)
- Verified: November 6, 2026, against Anthropic's own pages
- Page: https://www.okapi.bot/models/anthropic/claude-3-7-sonnet/

## Anthropic's words

> API model name: claude-3-7-sonnet-20250219; Current state: Retired; Deprecated: October 28, 2025; Tentative retirement date: February 19, 2026

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent