Anthropic unveils Fable 5.2 and Mythos 5.2 models ahead of IPO

If you're about to ask investors for $100 billion, it's a good time to have something new to sell.Anthropic today launched Claude Fable 5.2 and its unrestricted counterpart, Mythos 5.2, with the company claiming another significant leap in performance at a lower price.

The first impression isn't great, as it doesn't look like a big leap forward.The timing is notable as Anthropic prepares for what could be the largest IPO in history, potentially raising $80 billion to $100 billion at a valuation of as much as $1.75 trillion.The company says the new models outperform Opus 5.5 on nearly every benchmark it tested, including a win over OpenAI's GPT-6 Astra in agentic coding.

Fable 5.2 scored 69.9% on FrontierSWE v2 compared to 65.5% for Astra.From the PR:Testers have found that Fable 5.2 and Mythos 5.2 communicate more clearly than past Fable and Mythos models.

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