Claude Fable 5.2 Is Here, And It Solved A Black Hole Problem Stuck Since 2003
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Claude Fable 5.2 Is Here, And It Solved A Black Hole Problem Stuck Since 2003
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Summary Report
Anthropic releases Claude Fable 5.2 and Mythos 5.2; Fable designed working devices and finished a black hole calculation stuck since 2003.
- 01. Same model as Mythos 5.2; $8/$40 per million tokens; 1M context; apps, Claude Code, API
- 02. Designed three working devices; black hole calculation stuck since 2003; preprints not peer reviewed
Anthropic has released Claude Fable 5.2 alongside Mythos 5.2. They're the same model, but Mythos only goes to vetted cybersecurity and biomedical teams. Fable is out now in the Claude apps, Claude Code, the API and the major clouds, at $8 per million input tokens and $40 per million output, with a 1M-token context window. It beats Fable 5.1 and Opus 5.5 on most coding and reasoning tests, though not all. In pre-release testing it designed three working electronic devices from a one-paragraph prompt, and finished a black hole calculation that had been stuck since 2003. Physicists checked the results, but the preprints aren't peer reviewed. Paying subscribers get Fable resets, more the longer they've been subscribed.
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