Report: Anthropic Ships Claude Fable 5.2, Beating Opus 5.5 on Coding With 2.5x Fast Mode
VectorWireAI · reddit · 2026-11-10
VectorWire reports that Anthropic released Claude Fable 5.2 and Claude Mythos 5.2 on November 9, pitched for "the most ambitious, open-ended technical work." Fable 5.2 reportedly tops Opus 5.5 on coding benchmarks and adds a 2.5x Fast mode.
The report also notes this is Anthropic's first release since a third-party METR assessment suggested the lab may be approaching recursive self-improvement, with internal models reportedly speeding up Anthropic's AI progress by roughly 2x. Details come from a third-party site and are unconfirmed.
Related event: Anthropic Launches Claude Fable 5.2 and Mythos 5.2(68 posts)→
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