# Anthropic launches Claude Fable 5.2 and Mythos 5.2 with science and coding gains

> Original title: Anthropic launches Fable 5.2 and Mythos 5.2 with science, coding upgrades

- Source: SiliconANGLE · AI
- Published: 2026-11-10T00:08:34.000Z
- Bad Influence: https://badinfluence.news/items/a6o90ovgiawj2hounnar58uif
- Original: https://siliconangle.com/2026/11/09/anthropic-launches-fable-5-2-and-mythos-5-2-with-science-coding-upgrades/

## Summary

Anthropic has launched Claude Fable 5.2 and Claude Mythos 5.2, which it calls its most capable models to date. Fable 5.2 scored 74.6% on Terminal-Bench-Science 0.1, a 22% gain over Fable 5.1, and it blocks certain biology and cybersecurity requests. Mythos 5.2 has looser guardrails and is available only to trusted researchers through limited-access programs.