Anthropic releases Claude Fable 5.2 and Mythos 5.2, faster and 20% cheaper than 5.1
Anthropic released Claude Fable 5.2 to all users and Claude Mythos 5.2 to vetted organizations on November 9, 2026, with better coding, reasoning and vision, up to 30% faster output and API pricing of $8/$40 per million input/output tokens.
What happened
- Fable 5.2 and Mythos 5.2 are the same underlying model: Fable carries cybersecurity and biology safeguards and is generally available, while Mythos has more permissive safeguards and is limited to organizations in Anthropic's Cyber and Life Sciences Verification Programs.
- Anthropic says both generate output up to 30% faster than the 5.1 versions and cost $8 per million input tokens and $40 per million output tokens, down from $10 and $50 for Fable 5.1.
- An optional fast mode speeds up generation by up to 2.5 times, priced at $16 input and $80 output per million tokens, on the Claude Platform, Claude Code, Google Cloud and Microsoft Foundry.
- Fable 5.2 is available to Pro, Max, Ultra, Team and Enterprise users and on AWS, Google Cloud and Microsoft Azure as claude-fable-5-2.
- Anthropic still recommends starting most coding and knowledge work with Claude Opus 5.5 and moving up to Fable or Mythos for the most ambitious technical work.
Why it matters: Teams that reach for Anthropic's top model on hard engineering or research work get a cheaper, faster option. Fable flags some security and biology queries and may route them to less capable models, so affected teams may need to apply for verification.
Sources
- Anthropic: Introducing Claude Fable 5.2 and Claude Mythos 5.2 anthropic.com
- Anthropic: Claude Fable product page anthropic.com
Checked November 10, 2026 against the sources above. Claims about performance or benchmarks are the company's own unless stated otherwise.