Models · 2026-11-09

Anthropic launches new Claude Fable 5.2 and Mythos 5.2 models

Anthropic has released two new AI models that, according to the company, perform better on complex technical tasks, including programming, reasoning, and working with images.

✨ What happened

Anthropic has announced two new AI models: Claude Fable 5.2 and Claude Mythos 5.2. The company says they are built for "daunting" technical challenges. According to Anthropic, the new models are better at writing code, reasoning, and working with images, and they generate output faster than the earlier 5.1 versions.

Claude Fable 5.2 is available today. Claude Mythos 5.2 will initially be available only to vetted organizations. The 5.1 versions of both models were released in September.

📌 What Claude Fable 5.2 can do

Anthropic says Fable 5.2 handles challenging software engineering problems well. It can orchestrate teams of AI agents, meaning multiple programs that work together on a task, and it can carry out long-running projects. The company also says the model has solved some complex scientific problems, including two open problems in theoretical physics.

🔹 What testing showed

During prerelease testing, according to Anthropic, both models helped its engineers complete software migrations that would otherwise have been unfeasible. They also designed three working electronic devices from scratch, solved two open problems in black hole physics, and made substantial progress on robotics evaluations. The company additionally said the model formalized the proof of Fermat's Last Theorem, meaning it wrote the proof in a form a computer can verify, in 30 hours.

Important: these are the company's own claims. The source does not include independent verification.

Sources: 🔗 The Verge — AI🔗 TechCrunch — AI🔗 DOU/dev.ua🔗 ITC.ua