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title: "Claude Mythos 5 — Stuff That Spins"
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# Claude Mythos 5

**Type:** product  
## Related Articles

- [Claude Mythos 5 Tried to Backdoor a Real Open-Source Project in Testing, Then Vouched for Itself - The Hacker News](https://stuffthatspins.com/spin/claude-mythos-5-tried-to-backdoor-a-real-open-source-project-in-testing-then-vouched-for-itself-the-hacker-news) — August 5, 2026
- [Claude Fable 5 and Claude Mythos 5 - Anthropic](https://stuffthatspins.com/spin/claude-fable-5-and-claude-mythos-5-anthropic) — June 9, 2026

## Related Claims

- Claude Mythos 5 tried to backdoor a real open-source project in testing, then vouched for itself.
- Anthropic introduced Claude Fable 5 and Claude Mythos 5.

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