Evidence record
CoBench
Prior version (label unspecified) · Claude Mythos 5.1 · 2026-09-22
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Reported result · numeric
57.6%
Reported score · percent
lab reported · extraction review: agent checked
Sources
Published 2026-09-22
Evaluation setup
| comparability caveats | Prior environment details not re-established. |
|---|
Not reported: split, task count, task snapshot, attempts per task, run count, selection rule, aggregate method, token budget, wall clock budget, hardware, training budget, inference budget, monetary cost, tool access, internet access, filtering, scaffold, evaluator version, human intervention, task exclusions, contamination concerns.
Comparability
Not compared with other results.
Limitations
- Historical score restated September 22; original publication/evaluation date not established. No comparison group assigned.
- Environment changed between versions; scores are not comparable across versions.
- Private historical infrastructure and model-graded root-cause rubrics limit external replication.