Anthropic Launches Claude Fable and Mythos 5.2 AI Models

Anthropic PBC launched two new artificial intelligence models, Claude Fable 5.2 and Claude Mythos 5.2, to address complex technical challenges. The release occurs as the company prepares for its initial public offering on Wall Street.

Claude Fable 5.2 is available immediately and offers improved capabilities in vision, reasoning, and software engineering. The model can coordinate over 1,000 AI agents to manage long-running projects. Anthropic reports that Fable 5.2 formalized the proof of Fermat’s Last Theorem within 30 hours and solved two open theoretical physics problems concerning black holes. This model is faster and less expensive than the previous 5.1 version.

Claude Mythos 5.2 is being released exclusively to vetted organizations through a verification program. This model contains fewer safeguards for work involving life sciences and cybersecurity. Like Fable 5.2, Mythos 5.2 is faster than its 5.1 predecessor.