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← Back to all updatesPublished ·Anthropic◆ Critical
Anthropic removed model overview text naming Claude Fable 5 and Claude Mythos 5
The read
Any agent using those modelcard IDs should verify current docs before routing Anthropic work.
The frame
The deletion includes Claude API IDs, Bedrock IDs, Vertex AI IDs, and limited availability notes.
Primary source
Anthropic modelcard →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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