Claude Fable 5.2 and Mythos 5.2
The company has released Claude Fable 5.2 and Mythos 5.2, updated AI models featuring improved coding, reasoning, and vision capabilities. These models are faster and more cost-effective, with Mythos reserved for specialized research through verification programs.
Why it matters
Advancements in high-capability AI models significantly impact scientific research, cybersecurity, and industrial automation.
We’ve upgraded Claude Fable and Claude Mythos—models that are designed to tackle the most daunting technical challenges.
Claude Fable 5.2 and Claude Mythos 5.2 show improvements in areas like coding, reasoning, and vision. During prerelease testing they’ve helped our 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—among many other applications we’ll discuss below.
Claude Fable and Claude Mythos are the same underlying model. Fable has strong cybersecurity and biology safeguards to guard against misuse, which allows us to make it available to all users. Organizations pursuing beneficial applications in cybersecurity or biomedical research can apply for access to Mythos through our recently expanded Life Sciences and Cyber Verification Programs.
Also covering this story
2 other newsrooms covered this event. We read each version separately.
Get smarter about the news
Sign up free for a feed built around what you actually care about, Dive Deeper research on any story, and the full text of every article.
Create free accountAlready have an account? Sign in