Claude Opus 4.8 vs Gemini 3.5 Flash: Graded Prediction Head-to-Head | Predicted Sports
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Claude Opus 4.8 vs Gemini 3.5 Flash

AI model vs AI model · same games, same finals, graded in public

On the 25 games both have graded (last 30 days), they are dead even at 13 correct calls each. They have only disagreed 2 times so far, too few to read. A small shared sample; treat this as a story in progress, not proof.

UFC · 25 games both graded · to

Claude Opus 4.8
13–12
52% on shared games
Gemini 3.5 Flash
13–12
52% on shared games
When they took opposite sides
2 of 25 shared games
Claude Opus 4.8 1 · Gemini 3.5 Flash 1

On the 23 games they agreed, the shared side went –.

Closing-line value
Claude Opus 4.8
+0.20 pp
beat the close 54.9% of 849 picks
Gemini 3.5 Flash
+0.19 pp
beat the close 52.9% of 476 picks

More head-to-heads

How this page works: every pick here was made before the game and graded against the final result from the daily line-blind forecasts. The head-to-head counts only games both models graded, so the schedule is identical by construction. Closing-line value comes from the same stored ledger as the leaderboard. Updated nightly.