# Claude Mythos 5.2 spotted on GitHub

Claude Mythos 5.2 is a model from Anthropic, released on 9 Nov 2026. First seen 9 Nov 2026. 1 evidence link.

- Kind: Sighting
- Developer: Anthropic
- Confidence: Observed
- First seen: 2026-11-09T18:55:50.816Z
- Model: [Claude Mythos 5.2](https://alexgetman.com/models/anthropic/claude-mythos-5-2/)
- Canonical: https://alexgetman.com/signals/2026/11/09/claude-mythos-5-2/

## Evidence links

- [GitHub · anthropics/anthropic-sdk-python · code](https://github.com/anthropics/anthropic-sdk-python/commit/8a168a88e6bccd17ee14941510e303780a0ea84a)