441e85161ClaimAnthropic launched Claude Fable 5.2 and Claude Mythos 5.2 on November 9, 2026, targeting coding, reasoning, and AI agent tasksAgreeDisagree
441e85161ClaimAnthropic said Claude Fable 5.2 scored 51.4% at Max effort on Zapier's AutomationBench business automation test, behind Gemini 4 Carbon's score of 53.9%AgreeDisagree
441e85161ClaimAnthropic said during pre-release testing, 1,000 Fable 5.2 agents formalized the proof of Fermat's Last Theorem in Lean in 30 hours, compared to 26% completion in 18 hours by Opus 5.5AgreeDisagree
441e85161ClaimAnthropic said Claude Fable 5.2 scored 49.1% at Xhigh effort on the FrontierCode 2.0 agentic coding benchmark, leading GPT-6 Astra at 42.8% and Gemini 4 Carbon at 41.1%AgreeDisagree
441e85161ClaimIn a pre-release project, 1,000 Fable 5.2 subagents built an operating system over eight days that boots on a laptop, offers network access, and includes a Claude sidebarAgreeDisagree
441e85161ClaimArtificial intelligence systems are patient and listen to people in ways that humans often do notAgreeDisagree