Claude Mythos 5.1
- Made by
- Anthropic
- Released
- Announced in
- Introducing Claude Fable 5.1 and Claude Mythos 5.1anthropic.com
- Event
- Claude Fable 5.1 and Mythos 5.1
- API record
- /api/v1/models/claude-mythos-5-1
Benchmark results
| Benchmark | Score | Source check |
|---|---|---|
| Terminal-Bench 4.0 | 60.9% | CheckedA person checked this number against its source on 19 Oct 2026. This confirms the number matches what the lab published, not that the score was reproduced.CorroboratedThe same number is printed in 1 other lab document: 1 |
Sources
Reported by Anthropic
- Introducing Claude Fable 5.1 and Claude Mythos 5.1anthropic.com · 1 Sep 2026
Our capture of the source