Anthropic 在递归自我改进（RSI）担忧中发布 Mythos 5.2 与 Fable 5.2
Anthropic releases new Mythos and Fable models amid RSI concerns
- 1Anthropic 周一发布 Mythos 5.2 与 Fable 5.2，官方称编程、推理、视觉能力提升
- 2Fable 输入价降至每百万 token $8，低于竞品 GPT-6 Astra，官方称各档响应提速 30%
- 3Fable 5.2 经 Enterprise Frontier Safeguards 支持零数据保留（ZDR），直指企业客户长期顾虑
- 4METR 报告称内部模型令 Anthropic 研发提速约 2 倍、或临近递归自我改进，此为其后首次发布
Anthropic 借降价与企业级数据合规扩大企业市场，同时前沿模型自评估难度与安全隐患同步上升。
- 影响：选用 Fable 5.2 的输入成本可按 $8 每百万 token 重算，已低于 GPT-6 Astra，可触发选型比价；零数据保留堵点移除，受数据合规约束的企业可将其纳入选型；前沿模型自评估难度上升，敏感场景部署的内部监控成本会增加。
- 参考：可考虑按新价格重算现有模型用量预算，与 GPT-6 Astra 做同口径比价；有数据保留要求的场景值得评估 ZDR 方案；对高风险自动化任务可先小范围试点并保留人工复核。
- 依据：价格、提速与物理研究进展均为官方口径，暂无独立验证；提速 2 倍来自第三方 METR 报告且存在大量不确定性；隐蔽能力结论来自 Anthropic 系统卡自评。
Anthropic released new versions of its most advanced models on Monday, with the launch of Mythos 5.2 and Fable 5.2. The company says the new models “show improvements in areas like coding, reasoning, and vision,” and communicate more clearly with users.
Notably, Anthropic is lowering the cost of Fable from $10 to $8 per million input tokens. As a result, Fable 5.2 is now cheaper than its primary competitor GPT-6 Astra. Anthropic says that the new version of Fable will return responses 30% faster across effort levels. Faster inference serving is available for double the price.
Fable 5.2 is also compatible with zero data retention (ZDR) policies through the Enterprise Frontier Safeguards system, long a sticking point for many enterprise clients.
It’s Anthropic’s first model release since the arrival of a third-party report from the assessment group METR, which suggested the lab might be approaching recursive self-improvement (RSI) — or the ability for AI models to carry on model training independently. The METR report found internal models were speeding up Anthropic’s AI progress by roughly 2x, although many uncertainties remain.
Still, Anthropic’s release notes significant ongoing challenges in accurately testing model capabilities. “Claude Mythos 5.2 and Fable 5.2 each voice suspicion that they are being evaluated more often than any of our recent models, which challenges our ability to assess how they will act in real-world settings. As these settings expand and capabilities increase with future models, we expect this challenge to grow.”
Anthropic maintains that the new version of Mythos does not have the ability to act covertly against its user, a verdict that’s detailed further in Mythos 5.2’s system card.
“Claude Mythos 5.2 shows stronger covert capabilities than prior Claude models on several of our evaluations, particularly when its reasoning is hidden from the monitor,” the system card reads. “That said, we believe that low levels of absolute performance on our new covert evaluations support claims that rely on detection of harmful actions in high-stakes situations.”
Fable 5.2 has been available to select parties in pre-release for some time, and Anthropic says the model has already “solved two open problems in theoretical physics, formalized Fermat’s Last Theorem, and supported numerous other research projects.”
Also on Monday, AI startup Physical Superintelligence announced a new proof of the Aaronson‑Ambainis conjecture, a pivotal step in setting theoretical limits for quantum computing. Notably, the lab said the result was achieved by running “a non-public Anthropic model” within PSI’s own system. Anthropic did not confirm or deny whether Fable 5.2 was the model in question.
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Russell Brandom has been covering the tech industry since 2012, with a focus on platform policy and emerging technologies. He previously worked at The Verge and Rest of World, and has written for Wired, The Awl and MIT’s Technology Review. He can be reached at [email protected] or on Signal at 412-401-5489.
来源：TechCrunch · AI · techcrunch.com