Decision making refers to the environments where the LLM is called on every tick (like games with social communication), examples here: https://gertlabs.com/spectate.

Because GPT 5.5 just launched and those games take longer to accumulate data for, it just doesn't have enough samples yet. It will end up with a wider lead on Opus, I am sure. Coding evals always have large sample sizes on day 1. Good find, we should probably better adjust the weighting here for decision games with low match counts.