The company says the pair is built for daunting technical work, with faster output than the 5.1 generation.
Anthropic launches new Claude Fable and Mythos 5.2 models aimed at the hardest technical work on its Claude lineup. The company is announcing Claude Fable 5.2 and Claude Mythos 5.2 as upgrades designed to take on daunting technical challenges, with claimed gains in coding, reasoning, and vision, and with faster generation than the 5.1 versions of Fable and Mythos.
Claude Fable 5.2 is the version going live for a wide audience. Anthropic says it is strong on challenging software engineering problems, can orchestrate agent teams, and can tackle long-running projects. The company also says the new model has solved complex scientific problems, including two open theoretical physics problems. Claude Mythos 5.2 is the more restricted sibling: like earlier Mythos releases, only vetted organizations can use 5.2 at the start.
In prerelease testing, Anthropic says the two models helped its engineers complete otherwise-infeasible software migrations, designed three working electronic devices from scratch, solved two open problems in the physics of black holes, made substantial progress on robotics evaluations, and formalized the proof of Fermat's Last Theorem in 30 hours. Those claims sit in the same launch narrative The Verge reported: a pair of models sold as tools for work that previous Claude versions could not finish.
The 5.2 models follow Claude Fable 5.1 and Claude Mythos 5.1, which Anthropic released in September. Fable remains the public-facing track for demanding technical jobs, while Mythos stays behind an access gate for organizations that Anthropic has already reviewed. Jay Peters reports that Fable 5.2 is launching today, with Mythos 5.2 rolling out first to that vetted group.
The launch keeps Anthropic's split between a generally available high-end model and a restricted twin for sensitive domains. Teams that already use Fable for long agent runs or hard coding work now have a faster 5.2 checkpoint to evaluate, while Mythos 5.2 stays limited until more organizations pass Anthropic's checks. Read more: The Verge.
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