Breaking model

Claude Sonnet 3.7 and Haiku 3.5 retired on the Claude API; requests to them now fail

Took effect Feb 19, 2026 · models claude-3-7-sonnet-20250219 / claude-3-5-haiku-20241022

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

What changes

Sonnet 3.7 was deprecated October 28, 2025 and Haiku 3.5 December 19, 2025; both retired February 19, 2026 on Anthropic-operated platforms. Recommended replacements are claude-sonnet-4-6 and claude-haiku-4-5-20251001.

Breaking: Calls fail after this date.

What to do

Switch to claude-sonnet-4-6 / claude-haiku-4-5-20251001; move model ids to config.

Strings to search for

claude-3-7-sonnet-20250219claude-3-5-haiku-20241022claude-3-7-sonnet-latestclaude-3-5-haiku-latestclaude-3-7-sonnetclaude-3-5-haiku

Source

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