Fable 5.2 is Scary Powerful
Anthropic just released Fable 5.2. To show what it can do, they put a thousand copies of it on one of the hardest proofs in math and didn't tell them how to work together. In ten minutes the AIs had organized themselves like a company. In under thirty hours they finished a job that took eleven days two months earlier.So how big of a jump is this model? This video goes through that run using the messages the AIs wrote to each other, what else the model built, and the one skill Anthropic says it held back on purpose: the research that builds better AI.
0:00 Why Fable 5.2 matters
1:10 Fermat's Last Theorem
2:55 1,000 AIs, no boss
4:24 "Honest odds are low"
5:53 What else it built
6:50 The skill Anthropic held back
8:23 My take
## Sources
- Anthropic, "Introducing Claude Fable 5.2 and Claude Mythos 5.2" (Nov 9, 2026)
- Anthropic, Claude Fable 5.2 and Mythos 5.2 system card
- Anthropic, "Safely scaling multi-agent teams with Claude Fable 5.2"
- Anthropic, "Formalizing Fermat's Last Theorem" (Sep 4, 2026)
- Anthropic, "Claude-designed electronics"
- Anthropic, "Redeploying Fable 5" (July 2026)
- METR, "Independent Assessment of AI R&D Acceleration at Anthropic in October 2026"
- Kevin Buzzard, Mathematical Foundations of AI Conference 2026 (Erlangen AI Hub)
- The Next Web, Fortune
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