Anthropic’s newest Claude models have taken on engineering challenges that typically demand extensive human expertise and months of work. Claude Fable 5.2 and Claude Mythos 5.2 have demonstrated significant improvements across software development, robotics, mathematics, and theoretical physics.
During internal testing, Fable 5.2 coordinated more than 1,000 agents to build a working operating system. The model also helped researchers tackle two previously unresolved problems involving black holes. In another experiment, it completed a computer-verifiable formalization of Fermat’s Last Theorem in just 30 hours.
These results suggest the models can handle increasingly complex technical assignments. Anthropic says both versions share the same underlying architecture. However, Mythos targets vetted cybersecurity and biomedical research organizations.
One of the more striking experiments involved building an operating system from scratch. An Anthropic engineer gave Fable 5.2 a basic prompt and an empty project folder.
The model coordinated more than 1,000 subagents over eight days. They wrote code, tested components, and reviewed their work throughout the process.
The resulting operating system could boot on a laptop. It included its own kernel, hardware drivers, and permanent file storage. It also featured a graphical interface, login screen, installer, and built-in Claude functionality.
Introducing Claude Fable 5.2 and Claude Mythos 5.2, designed to tackle the most daunting technical challenges.
They’re capable collaborators on ambitious projects in many fields, and show improvements in areas like coding, reasoning, and vision. pic.twitter.com/jP0AutLxXb
2 demonstrated its capabilities. Anthropic also tasked it with designing three electronic devices.
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