Anthropic Launches Claude Fable 5.2 and Mythos 5.2: Faster, Cheaper, Smarter
Anthropic has unveiled its most powerful AI models yet: Claude Fable 5.2 and Claude Mythos 5.2. Launched on November 9, 2026, as the company prepares for its anticipated IPO roadshow, both models share the same underlying architecture and are designed for demanding technical challenges, with improvements in coding, reasoning, and vision.
According to Anthropic, the models generate outputs 30% faster than their 5.1 predecessors. Pricing is $8 per million input tokens and $40 per million output tokens—about 20% lower than the previous flagship pricing.
In pre-release testing, the models reportedly:
- Designed three working electronic devices from scratch.
- Solved two open problems in black hole physics.
- Formalized a proof of Fermat’s Last Theorem in just 30 hours.
Claude Fable 5.2 is available to all paid subscribers and developers through Amazon Web Services, Google Cloud, and Microsoft Azure. Claude Mythos 5.2, its less-restricted counterpart, is reserved for vetted organizations in cybersecurity and biomedical research through Anthropic’s Verification Programs.
On launch day, Fable 5.2 claimed the #1 spot on the Artificial Analysis Intelligence leaderboard, surpassing Google’s Gemini 4 Carbon.
The launch marks Anthropic’s first frontier model release since CEO Dario Amodei publicly called for a slowdown in AI development in September 2026.
Sources: Anthropic official announcement | CNBC