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Opus 5 surpasses Fable 5 comprehensively in benchmarks, but actual experience falls far short, public benchmarks nearly invalid
Opus 5 surpasses Fable 5 in multiple general benchmarks, but actual user experience is far inferior, indicating that existing public benchmarks are almost completely invalid. Anthropic adopted a new approach in the 5 series, first training Mythos and then distilling Sonnet and Opus, but Sonnet 5 performs poorly and Opus 5 receives mixed reviews.
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