Anthropic 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 5.5

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From the articleAnthropic launches Fable 5.2 and Mythos 5.2 with science, coding upgrades - SiliconANGLEAlso in Anthropic Launches Claude Fable 5.2 and Mythos 5.2: Same Model, Different Safeguards, Anthropic's Claude Fable 5.2 Beats GPT-6 Cyber in Multi-Stage Cyberattack Benchmark, Anthropic releases Claude Fable 5.2 and Mythos 5.2, pairing new, record-high benchmarks with 20% API cost reduction

441e85161Article

Anthropic launches Fable 5.2 and Mythos 5.2 with science, coding upgrades - SiliconANGLE

441e85161Article

Anthropic Launches Claude Fable 5.2 and Mythos 5.2: Same Model, Different Safeguards

441e85161Article

Anthropic's Claude Fable 5.2 Beats GPT-6 Cyber in Multi-Stage Cyberattack Benchmark

441e85161Article

Anthropic releases Claude Fable 5.2 and Mythos 5.2, pairing new, record-high benchmarks with 20% API cost reduction