174163–185Index score#12 of 229 models
4/ 8Core tests taken4 of 6 areas · plus 21 anchor tests
−3Versus the frontier at releasebest then: GPT-5.5Replaced by Claude Opus 5 $5.0/ $25Price per million tokensinput / output, list price
1MContext windowtokens it reads at once
Where it sitson the frontier
GPT-5.5 reached this score 1 month earlier.
Test resultsby area · tick = best by any model
Reasoning & knowledgeevidence
Humanity's Last Examno result Codingevidence
SWE-bench Verifiedno result Long tasksno evidence yet
METR time horizonno result Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.