Breaking model

Claude Haiku 3 retired on the Claude API; requests to it now fail

Took effect Apr 20, 2026 · model claude-3-haiku-20240307

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

What changes

Deprecated February 19, 2026 and retired April 20, 2026 on Anthropic-operated platforms (Claude API, Claude Platform on AWS, Microsoft Foundry). Requests to retired models fail. Recommended replacement is claude-haiku-4-5-20251001.

Breaking: Calls fail after this date.

What to do

Switch to claude-haiku-4-5-20251001 and re-check cost and latency budgets before cutover.

Strings to search for

claude-3-haiku-20240307claude-3-haiku

Source

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