Anthropic releases first frontier models since Amodei's call for slowdown as IPO buzz builds

Anthropic announced Monday the release of two new AI models, Claude Fable 5.2 and Mythos 5.2, according to Gizmodo. Yahoo Finance reported that the debut comes as the company nears an initial public offering, while CNBC framed the release as Anthropic's first frontier models since Amodei's call for a slowdown. Bloomberg.com also described the unveiling as happening ahead of an IPO.

Fable 5.2 will become Anthropic's most powerful publicly available model and its highest-performing yet for open-ended technical work, Gizmodo reported. Mythos 5.2 will remain restricted to approved organizations through the company's Cyber Verification Program and Life Sciences Verification Program. Both products use the same underlying model, but Fable carries stronger restrictions on cybersecurity and biological research capabilities, Gizmodo said.

Anthropic claimed the models are among its most capable ever, with improvements to coding, reasoning, and vision, according to Gizmodo. The company said outputs can be generated up to 30% faster than Fable 5.1 and Mythos 5.1, while cutting prices to $8 per million input tokens and $40 per million output tokens for both models, making them slightly cheaper than OpenAI's most powerful model, GPT-6 Astra. Quartz reported that Anthropic cut prices 20%.

The company made several extraordinary claims about the models' abilities. Anthropic said Fable 5.2 solved two previously unsolved black hole physics problems, designed working electronic devices, and produced a computer-verifiable version of the proof of Fermat's Last Theorem, Gizmodo reported. The company also claimed Fable 5.2 coordinated more than 1,000 subagents to write code for a functioning prototype operating system in about eight days, and that a team of about 1,000 Fable 5.2 agents translated the existing mathematical proof of Fermat's Last Theorem into a computer-verifiable form in just 30 hours, a task that took an earlier version of Claude 11 days. The research papers on the black hole findings have not undergone independent peer review, Gizmodo noted.

Fable 5.2 will be made available across Anthropic's platforms starting today, with upped usage limits for paid subscribers, according to Gizmodo.