Which model leads GMMLU?

Q: Which model leads GMMLU?

Claude Opus 5.5 tops the board at 94.3

GMMLU Leaderboard — 5 Models Ranked

Pro Mode — raw scores, one benchmark under the lensofficial card harness

The field · 5 measured

8994.3

5 models measured, most on the official card harness. Claude Opus 5.5 tops the board at 94.3.

5 measured·1 new this week·Lifecycle Updated Sep 23, 2026Basis

#◆Vendor$/M in$/M out

Leader — ignites whiteField — fill cools with scoreIndependently verified only0 of 5Bars show 89–94.3 · ◆ solid = first-party or better · outlined = arm's-length

01Claude Opus 5.5NEWAnthropic94.3$4.0/M$20.0/M$0.127

02Claude Fable 5.1+1 altAnthropic94$10.0/M$50.0/M$0.319

03Claude Fable 5Anthropic93.6$10.0/M$50.0/M$0.321

04Claude Opus 5+1 altAnthropic92.5$5.0/M$25.0/M$0.162

05Claude Sonnet 5+1 altAnthropic89$2.0/M$10.0/M$0.067

◆ solid = independently verified · aggregator attested · vendor attributed — outlined = cross-reference · source-attributed. Dimmed ◆ = confidence inferred. “+N alts” = alternate disclosures in the drawer with why-demoted. Prices per million tokens; $/point = input price ÷ score. Every row opens its model dossier.

Verification: 5 models scored · 0 independently verified · 5 vendor-reported · 0 with source disagreement. How these tiers are assigned