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Published Jun 12, 2026·Anthropic• Minor

Anthropic retired Claude Haiku 3; requests to it now return an error.

The read

All requests now fail unless they move to the recommended Claude Haiku 4.5.

The frame

For builders, this is a hard deprecation: replace claude-3-haiku-20240307 with Claude Haiku 4.5.

Primary source

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