Anthropic releases Fable and Mythos 5.2, starts IPO roadshow
What happened
On November 9, Anthropic's developer blog said 1,000 early Fable 5.2 agents were given a statement, prompts, definitions and lemmas, then worked together over Git and a shared database to reproduce a formal proof of Fermat's Last Theorem. They had no Prove2Me and no guidance from researchers. Earlier reports put the run at 28.7 hours; later reports said it finished within 30 hours. On November 10, several outlets confirmed the release of Fable 5.2 and Mythos 5.2, which the company says improve coding, reasoning and vision. On speed, earlier reports said up to 30% faster than 5.1; later reports said 30% faster at every effort level. Fable input pricing fell to $8 per million tokens. Later reports put Fable at 65 on the Artificial Analysis index, ranked first, and said Anthropic began its IPO roadshow on Monday. The latest reports say Fable reached a 41.3% completion rate on RLI real freelance task tests, against 2.5% for leading system Manus a year earlier, with most of the gain in audio and music editing, architecture and interior design, and 3D model making.
Written by AI from the coverage · updated 2 days ago
Developments
- Nov 10 22:07 · 1 reportAnthropic's Fable 5.2 completes 41 percent of real freelance jobs, up from 2.5 percent a year agoThe Decoder
- Nov 10 04:04 · 1 reportClaude Fable 5.2 scores 65 on Artificial Analysis, highest so farHacker News front page
- Nov 10 02:56 · 6 reportsAnthropic releases Claude Fable 5.2 and Claude Mythos 5.2The Verge · AI
- Nov 9 20:00 · 1 reportAnthropic runs 1,000 Claude Fable 5.2 agents to formalize Fermat's Last Theorem in 28.7 hoursclaude.dev Blog
Coverage
Follow the reports to see the story from different sides.
- The DecoderAnthropic's Fable 5.2 completes 41 percent of real freelance jobs, up from 2.5 percent a year ago
Anthropic 的 Fable 5.2 在 RLI 真实自由职业任务测试中完成率达到 41.3%，一年前领先系统 Manus 仅为 2.5%。排名其后的 Opus 5.5 和 GPT 6 Astra 分别达到 21.25% 和 20.83%，Fable 5.2 的主要进步集中在音频与音乐编辑、建筑与室内设计及 3D 模型制作。
- Latent SpacePickAnthropic opens IPO roadshow, Claude Fable 5.2 tops LLM leaderboard
Anthropic started its IPO roadshow on Monday and released Claude Fable 5.2 and Claude Mythos 5.2. Fable 5.2 ranks first on the Artificial Analysis Intelligence Index v5 with 65 points.
- The DecoderPickClaude Fable 5.2 and Mythos 5.2 retake the AI performance lead ahead of Anthropic's IPO
Anthropic's Claude Fable 5.2 and Mythos 5.2 have retaken the AI performance lead. Fable 5.2 scores 65 on the Artificial Analysis Index v5 at its highest compute tier.
- Hacker News front pageClaude Fable 5.2 scores 65 on Artificial Analysis, highest so far
Claude Fable 5.2 在 Artificial Analysis Intelligence Index v5.0.1 上得分 65，为目前最高分。
- TechCrunch · AIPickAnthropic releases Mythos 5.2 and Fable 5.2, raising concerns about recursive self-improvement
Anthropic released Mythos 5.2 and Fable 5.2 on Monday, citing gains in coding, reasoning, vision and communication. Fable's input price drops from $10 to $8 per million tokens, responses are 30% faster at every effort level, and Enterprise Frontier Safeguards support zero data retention (ZDR).
- Hacker News front pageClaude Fable 5.2 launch offers
Claude Fable 5.2 于 November 9, 2026 上线，符合条件的付费套餐获得限时 Fable 使用福利，覆盖 Fable 5.2、Fable 5.1 和 Fable 5。
- The Verge · AIPickAnthropic releases Claude Fable 5.2 and Claude Mythos 5.2
Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2, citing gains in coding, reasoning and vision and faster output than version 5.1. In pre-release tests, the company says, the two models helped complete software migrations, designed 3 working electronic devices from scratch, solved 2 open problems in black hole physics and formalized a proof of Fermat's Last Theorem within 30 hours.
- Hacker News front pagePickAnthropic releases Claude Fable 5.2 and Claude Mythos 5.2
Anthropic released Claude Fable 5.2 and Claude Mythos 5.2, saying both improve on coding, reasoning and vision, with output up to 30% faster than version 5.1.
- claude.dev BlogPickAnthropic runs 1,000 Claude Fable 5.2 agents to formalize Fermat's Last Theorem in 28.7 hours
In a small experiment, Anthropic had 1,000 agents running an early Claude Fable 5.2 reproduce a formal proof of Fermat's Last Theorem in 28.7 hours. The team gave no Prove2Me or researcher guidance, only 60 lemmas to prove, short route hints, definitions and 47 previously proved lemmas. The agents coordinated through Git and a shared database, using a third of the original work's output tokens for a proof one-seventh as long.
Heat over time
Heat now 6·Comparable peak 45（Nov 10 06:00）·Comparable change over 24 hours -78%
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