This market will resolve to "Yes" if Opus 5 achieves an averaged MMLU multiple-choice accuracy score greater than or equal to the averaged MMLU multiple-choice accuracy score reported for GPT-5.6-Sol, in a publicly accessible evaluation conducted at any time after the creation of this market and before January 1, 2027 - 00:00 UTC.

Otherwise this market will resolve to "No."

For the purposes of this market:

- "MMLU" refers to the standard Massive Multitask Language Understanding benchmark (multiple-choice format). The measured quantity is averaged accuracy across MMLU tasks using the same dataset version and evaluation protocol for both models.

- Reported scores must be publicly accessible via official model documentation or publications, public benchmark leaderboards (e.g., PapersWithCode or equivalent), or independent third-party reproducible evaluations. If multiple directly comparable scores exist for a model on the same protocol, the highest publicly reported score will be used for comparison.

- The compared evaluations must be conducted after this market's creation. If no directly comparable MMLU evaluation exists for both Opus 5 and GPT-5.6-Sol by the deadline, this market will resolve to "No."