OpenAIAnthropicGooglexAIPerplexity
← Back to all updatesPublished ·Anthropic◆ Critical
Anthropic removed model guidance naming Claude Fable 5, Mythos 5, and Opus 5.
The read
Builders lose published model selection and availability text for these Claude 5 entries on this page.
The frame
The removed text had said Fable 5 was generally available June 9, 2026, while Mythos 5 was limited to approved Project Glasswing customers.
Primary source
Anthropic modelcard →Keep reading
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