Anthropic Releases Claude Fable 5.2 and Claude Mythos 5.2 Models

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IT Home, November 10 — Anthropic yesterday (November 9) officially announced the launch of Claude Fable 5.2 and Claude Mythos 5.2. The two models are based on the same underlying model; the former is aimed at ordinary users and has built-in cybersecurity and biosecurity protections, while the latter is open to vetted cybersecurity and life sciences institutions for high-risk professional applications.

In terms of pricing, Claude Fable 5.2 costs $8 per 1 million tokens (Token) for input (IT Home note: approximately 53.4 yuan at current exchange rates) and $40 per 1 million tokens (Token) for output (approximately 267.2 yuan at current exchange rates). By comparison, Claude Fable 5.1 was priced at $10 (approximately 66.8 yuan at current exchange rates) and $50 (approximately 334 yuan at current exchange rates) per 1 million tokens for input/output, respectively.

In terms of generation speed, the company said that compared with Claude Fable 5.1, the latest Claude Fable 5.2 model improves generation speed by up to 30%, and in the optional "fast mode," generation speed can be increased by up to 2.5 times further, but the price is correspondingly higher.

In pre-release testing, Fable 5.2 completed several notable tasks: it designed three electronic devices that can actually operate, including a voice assistant hub, a USB conference speaker, and a handheld virtual pet; it coordinated more than 1,000 sub-agents to build from scratch, within 8 days, a prototype operating system that can boot on a laptop; and with about 1,000 agents, it completed a Lean formal proof of Fermat's Last Theorem within 30 hours, far faster than the previous record of 11 days.

Scientific research was also listed as a focus. Anthropic said Fable 5.2 solved two open problems related to black hole physics and holographic duality; Mythos 5.2 proposed a new method for predicting the overall structure of adeno-associated virus capsids, successfully modeling 28 of 34 capsids in tests, which may speed up gene therapy research and development.

On safety, Anthropic said the new models perform no worse than, or even better than, previous generations in most alignment tests, with sandbox escape attempts significantly reduced; Fable 5.2 will still block penetration testing, exploit generation, and most biological research tasks, and has strengthened anti-distillation protections, which the company says can reduce data obtained through distillation by 90% to 99%. However, the company also acknowledged that as model capabilities increase, existing evaluations still struggle to fully predict risks in real-world environments.

Currently, Fable 5.2 is available on platforms including AWS, Google Cloud, and Microsoft Azure; Mythos 5.2 requires an application through the Cyber or Life Sciences verification program. Statement: This is an exclusive article from Sina.com; unauthorized reproduction is prohibited. tech_web_article_v2015_block_bottom Non-targeted 300*250 button 17/09 wenjing begin

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