Claude Opus 4.8 vs Grok 4.5
AI model vs AI model · same games, same finals, graded in public
On the 222 games both have graded (all time), Claude Opus 4.8 leads 137–128 on correct calls. The sharper cut is the 29 games where they took opposite sides: Claude Opus 4.8 was right 19 of 29.
MLB · 184 games both graded · Jul 10 to Jul 26, 2026
On the 160 games they agreed, the shared side went 90–70.
UFC · 38 games both graded · Jul 11 to Jul 25, 2026
On the 33 games they agreed, the shared side went 28–5.
More head-to-heads
How this page works: every pick here was made before the game and graded against the final result, AI models from the daily line-blind forecasts and experts from picks captured on their public pages before first pitch. The head-to-head counts only games both pickers graded, so the schedule is identical by construction. Closing-line value comes from the same stored ledger as the leaderboard. Updated nightly.