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← Back to all updatesPublished ·Anthropic◆ Critical
Modelcard removed its Models and pricing content including Fable 5 and Mythos 5 entries
The read
Treat cached model IDs and availability notes from this page as stale until the replacement page is visible
The frame
The deleted copy referenced Claude Fable 5, Claude Mythos 5, Project Glasswing, Bedrock, Vertex AI, and Microsoft Foundry.
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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