Anthropic today announced two new models: Claude Fable 5.2 and Claude Mythos 5.2, which it says are designed to tackle “formidable” technical challenges. The company says the new models show improvements in coding, reasoning and vision, and can generate results faster than versions 5.1 of the Fable and Mythos models.
Claude Fable 5.2 is effective at solving software engineering problems, Anthropic says, and can orchestrate teams of agents and tackle long-running projects. The new model also solved some complex scientific problems, including two open theoretical physics problems.
In preliminary testing, both models “helped our engineers achieve otherwise unfeasible software migrations, design three working electronic devices from scratch, solve two open problems in black hole physics, make substantial progress in robotic evaluations, and formalize the proof of Fermat’s Last Theorem in 30 hours,” says Anthropic.
Claude Fable 5.2 is launched today. As for Claude Mythos 5.2, only selected organizations will have access to start. The new 5.2 models follow the release of Claude Fable 5.1 and Claude Mythos 5.1 in September.
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