Anthropic quietly launches Claude Fable 5.1 for "hardest challenges"
External-Grape-2978 · reddit · 2026-09-02
A Reddit user spotted the unannounced release of Claude Fable 5.1 in the app, positioned above Opus 5 and described as being for "hardest challenges." There is no official launch post or model card yet, though the Bedrock identifier briefly showed "model not found" and users report seeing it in Claude Code. This rollout precedes the announcement, contradicting SEO blogs that have claimed it hadn't shipped since July.
Related event: Anthropic Releases Fable 5.1 and Mythos 5.1 with 75% Cheaper Caching(174 posts)→
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