Anthropic on Monday released Claude Fable 5.2 and Claude Mythos 5.2, calling them its most capable models for demanding technical work, and cut the price of Fable by 20 percent as the company approaches a possible public listing.
Fable 5.2 is generally available on the Claude API, in Claude apps and Claude Code, and through Google Cloud, Microsoft Foundry and the Claude Platform on Amazon Web Services, at $8 per million input tokens and $40 per million output tokens, down from $10 and $50 for Fable 5.1. Anthropic says it generates output up to 30 percent faster than its predecessor.
Mythos 5.2 shares Fable 5.2's specifications and pricing, but is limited to organizations in Anthropic's Cyber and Life Sciences Verification Programs. The two are the same underlying model: Fable carries stronger cybersecurity and biology safeguards and is open to all customers, while Mythos runs with fewer of those safeguards for vetted security and life-sciences researchers.
Anthropic says Fable 5.2 scores 49.1 percent on its FrontierCode 2.0 coding benchmark, against 32.4 percent for Fable 5.1 and 45.5 percent for Opus 5.5, and that a team of about 1,000 Fable 5.2 agents fully formalized Fermat's Last Theorem in Lean in about 30 hours. It also reports that Fable 5.2 scored 65 on the Artificial Analysis Intelligence Index, five points ahead of its nearest competitor.
The launch is Anthropic's first frontier release since chief executive Dario Amodei called in September for the AI industry to slow the pace of capability gains, and it lands in a delicate week: CNBC reported that the company's initial public offering could happen as soon as next week, and Anthropic was reported to be under valuation pressure as investors balked at a possible $1.5 trillion figure.
Anthropic still recommends starting on Claude Opus 5.5 for most coding and knowledge tasks and moving to Fable only for the hardest work. The rumored "Fable 5.5" and "Mythos 5.5" names that had circulated since early October never shipped; what arrived Monday was 5.2 of each.
