# Anthropic releases Claude Fable 5.2 and Mythos 5.2, claiming the benchmark lead

> Original title: Claude Fable 5.2 and Mythos 5.2 cement Anthropic's AI lead just before its IPO

- Source: The Decoder
- Published: 2026-11-09T21:15:23.000Z
- Bad Influence: https://badinfluence.news/items/ebupbt7ro7xv109vdmawm3r4y
- Original: https://the-decoder.com/claude-fable-5-2-and-mythos-5-2-cement-anthropics-ai-lead-just-before-its-ipo/

## Summary

Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2, which it says reclaim the AI performance lead. Fable is available to all users with safeguards that block risky cybersecurity and biology tasks. Mythos is limited to organizations approved through Anthropic's Verification Programs. Artificial Analysis ranks Fable 5.2 first on its Index v5 at the highest compute tier with 65 points, while its average per-task cost of $26.50 is about 2.6 times that of Opus 5.5.