Anthropic released Claude Fable 5.2 on Monday 9 November, its newest and most capable artificial intelligence model, alongside a sister model called Claude Mythos 5.2, according to SQ Magazine and MakeUseOf. The name has caused some confusion online: Fable 5.2 is an AI model, not a new version of the Fable video game.
According to Anthropic, Fable 5.2 generates outputs up to 30 percent faster than the 5.1 versions and costs less to run. The price is now $8 per million input tokens and $40 per million output tokens, down from $10 and $50 for Fable 5.1 — a 20 percent cut on both rates, according to Silicon Report and MakeUseOf.
On benchmarks, Anthropic says Fable 5.2 scored 49.1 percent on the FrontierCode 2.0 agentic coding test, ahead of Opus 5.5 at 45.5 percent, according to SQ Magazine. The company also says a team of 1,000 Fable 5.2 agents formalised the existing proof of Fermat's Last Theorem in 30 hours.
There is a catch on access. According to Anthropic, Fable 5.2 is generally available, while Mythos 5.2 is held back for vetted organisations through the company's Life Sciences and Cyber Verification Programs. Anthropic says the two are the same underlying model, with Fable carrying cybersecurity and biology safeguards that let it be sold to all users.
Claude Pro subscribers and standard Team seats can use Fable 5.2 at no extra cost through 16 November, according to MakeUseOf, with Fable able to consume up to 50 percent of their existing weekly allowance during that window. Anthropic still recommends starting most coding and knowledge work on Opus 5.5 and moving up to Fable only for harder, open-ended technical tasks. The release comes as Anthropic prepares for an initial public offering that could take place as soon as mid-November, according to Silicon Report.