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Karpathy on Claude Fable 5: same base model as Mythos, with a major leap in long-horizon tasks
What happened
Andrej Karpathy says Claude Fable 5 shares the same underlying model as Mythos but adds safety safeguards, and reaches state-of-the-art results by some margin on almost every benchmark.
Why it matters
Drawing on firsthand use, Karpathy calls Fable 5 a release worthy of a major version-number jump and describes concrete changes on long-horizon tasks.
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