I made Claude, GPT and Gemini predict the entire 2026 World Cup. Here's the experiment design.

The 2026 World Cup kicks off today: 48 teams, 104 matches, five weeks. I'm using it as a benchmark. Three frontier models (Claude Opus 4.8, GPT-5.2 and Gemini 3.1 Pro) predicted every group match with scorelines and win/draw/loss probabilities, then a complete knockout bracket down to the champion and Golden Boot. Every prediction was locked before kickoff and committed to a public repo. As real results arrive, a live site scores them automatically. Building it surfaced some genuinely weird mo...