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Anthropic says Fable 5.2 and Mythos 5.2 outperform Opus 5.5 in most evaluated capabilities

AIAnthropic says Fable 5.2 and Mythos 5.2 are a step above Opus 5.5 in almost all the capabilities it evaluated. Testers report that the models communicate more clearly than earlier Fable and Mythos versions.
ClaudeVerified on XOfficial
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Part of a thread · earlier post

Fable 5.2 and Mythos 5.2 are a step above Opus 5.5 in almost all the capabilities we evaluated.

Testers have found that they communicate more clearly than past Fable and Mythos models. They generate outputs up to 30% faster than Fable 5.1 and Mythos 5.1.

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Claude · x.comPublished · added here

Original title: Fable 5.2 and Mythos 5.2 are a step above Opus 5.5 in almost all the capabilities we evaluated.

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Anthropic / ClaudeEvals & benchmarks