# Claude Mythos 5.1

id: ent_claude-mythos-5-1  
kind: product  
timeline: /timelines/claude-mythos-5-1.md  
page: /record/claude-mythos-5-1  
same_as: https://asof.is/record/claude-mythos-5-1 (how to cite the id: /identifiers.md)  

Mythos model for Project Glasswing participants

## Fact pages

One page per fact: the current value with its sources, then every dated value and what replaced what. Fetch any of them as markdown.

- [Claude Mythos 5.1 release date](/record/claude-mythos-5-1/model_release.md)

## All claims

One claim per line, newest first. Superseded claims stay visible.


## Posts and Hugging Face repos (1)

Dated items from the entity's own feeds, and the days its Hugging Face repositories were created, newest first.

- [Claude Mythos 5.1](/record/claude-mythos-5-1.md) | model_release | Claude Mythos 5.1 | valid 2026-09-01 to present | conf 0.95 | valid | [clm_7B89C517BB64](/claim/clm_7B89C517BB64.md)
  sources: https://platform.claude.com/docs/en/release-notes/overview

---

AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.