OpenAIAnthropicGooglexAIPerplexity
← Back to all updatesPublished ·Anthropic• Minor
Claude Fable 5 and Claude Mythos 5 now omit thinking display by default.
The read
Readable thinking summaries require an explicit display setting, and raw chain of thought is never returned.
The frame
This matches Opus and Mythos Preview defaults, so multi-turn builds must pass thinking blocks back unchanged.
Primary source
Anthropic →Keep reading
See what Nova3 builds →Related updates
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- Jul 25, 2026Anthropic removed modelcard language for Claude Fable 5 and Claude Mythos 5.
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