Claude Mythos 5
- Made by
- Anthropic
- Released
- Announced in
- Claude Fable 5 and Claude Mythos 5anthropic.com
- Event
- Claude Fable 5 and Mythos 5
- API record
- /api/v1/models/claude-mythos-5
Benchmark results
| Benchmark | Score | Source check |
|---|---|---|
| Humanity's Last ExamNo tools | 59.0% | CheckedA person checked this number against its source on 17 Oct 2026. This confirms the number matches what the lab published, not that the score was reproduced. |
| Humanity's Last ExamWith tools | 64.5% | CheckedA person checked this number against its source on 17 Oct 2026. This confirms the number matches what the lab published, not that the score was reproduced. |
| SWE-bench Verified | 95.5% | CheckedA person checked this number against its source on 17 Oct 2026. This confirms the number matches what the lab published, not that the score was reproduced. |
| SWE-bench Proadaptive thinking, max effort; average of 5 trials · The source doesn't say whether this is the public or the commercial set | 80.3% | CheckedA person checked this number against its source on 17 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 |
| GPQA Diamondaverage of 5 trials | 94.1% | CheckedA person checked this number against its source on 17 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 |
| BrowseCompsingle agent; adaptive thinking, max effort; 10M-token limit, compaction at 200K tokens | 88.0% | CheckedA person checked this number against its source on 17 Oct 2026. This confirms the number matches what the lab published, not that the score was reproduced. |
Sources
Reported by Anthropic
- Claude Fable 5 and Claude Mythos 5 System Cardanthropic.com · 9 Jun 2026
Our capture of page 251