What Claude Fable 5.2 is
Claude Fable 5.2 is the new artificial intelligence model from Anthropic, the company that created Claude. It came out on November 9, 2026.
According to Anthropic's announcement, it is up to 30% faster than Fable 5.1, the previous version, and it costs less.
An operating system in 8 days
Fable 5.2 started with an empty folder. In 8 days it built an operating system. To do it, it coordinated more than 1,000 subagents that wrote, tested and reviewed the code day and night.
A subagent is an AI agent that receives one part of the work.
Three devices from one paragraph
With a single paragraph of instructions, Fable 5.2 designed three electronic devices. All three worked with no electrical changes.
Fermat's Last Theorem in 30 hours
Pierre de Fermat stated this theorem in 1637. More than 350 years went by before anyone proved it.
Fable 5.2 formalized it in 30 hours, with 1,000 agents. To formalize is to write the complete proof in a language that a computer checks step by step. The first time Claude did it, it took 11 days, with an unreleased research version and with help from people.
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