Claude Haiku 3 changelog

Every change to Claude Haiku 3 that Modelpeers has recorded, newest first, each with the source it came from. The record starts Apr 20, 2026.

All (1)Retiring (1)

April 2026

Model at Anthropic

RetiredApr 20, 2026

Claude Haiku 3 retired

Requests to claude-3-haiku-20240307 now return an error. The deprecation was announced on February 19, 2026.

Who is affected:: Apps still calling claude-3-haiku-20240307.
Action needed:: Switch to Claude Haiku 4.5 or Haiku 5.5.

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