System record

Claude Mythos 5.1

Organization: Anthropic ยท base model: Claude Mythos 5.1

System and setup

Reported system information
Model versionnot reported
Software used to run the modelnot reported
Software versionnot reported
Tools available to the modelAPI; API safety filter off; CoBench evaluation environment
Release dateNot reported

Autonomy assessments

No autonomy assessment is published for this system.

Published capability results

Benchmark and indicator evidence
MeasureVersionReported resultDate
CoBench2.153.4%2026-09-22
CoBenchPrior version (label unspecified)57.6%2026-09-22

Related research

Additional system details
System ID
mythos51
Organization
Anthropic
Base model
Claude Mythos 5.1
Release date
Not reported
Assessment records
0
Recursive evidence records
0