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← Back to all updatesPublished ·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
Anthropic →Keep reading
See what Nova3 builds →Related updates
- Jun 12, 2026Anthropic publicly documented stop_details on refusal responses, with category and explanation fields for routing.
- Jun 12, 2026Claude Opus 4.8 defaults the effort parameter to high across all surfaces.
- Jun 12, 2026Claude Opus 4.8 lowers prompt caching’s minimum cacheable prompt length to 1,024 tokens versus Opus 4.7.
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