Model retirement dates / Anthropic
claude-3-5-sonnet-20240620
Anthropic retired claude-3-5-sonnet-20240620 on 28 October 2025. API calls to it now fail. The recommended replacement is claude-sonnet-5-5.
| Provider | Anthropic |
|---|---|
| Status | Retired (as of 11 Nov 2026) |
| Shutdown | 28 October 2025 |
| Replacement | claude-sonnet-5-5 |
| Model type | Text |
| Source | Anthropic deprecations page |
Before you switch
A replacement model answers the same prompt differently: tone, length, format, and whether JSON still parses. Driftline Pro runs your real prompts on claude-sonnet-5-5 in CI, so you see the new answers before you ship the switch. See a drift test.
Check your code for it
Run this in your repository. No install and no API key; it lists every OpenAI, Anthropic and Google model ID it finds, with its retirement date and replacement:
npx -y @aidriftline/driftline .Or look for this ID only: grep -rn "claude-3-5-sonnet-20240620" . (misses aliases, Bedrock and Vertex names, and IDs split across lines).
To be warned automatically before the next retirement, add the free Driftline GitHub Action. It annotates the exact line in pull requests and can fail the build on retired models.
Same date at Anthropic
Checked against Anthropic's official page on 11 November 2026. Something wrong? hello@aidriftline.com