GPT-5.5 vs Claude Opus 4.8: Graded Prediction Head-to-Head | Predicted Sports
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GPT-5.5 vs Claude Opus 4.8

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

All time Last 30 days Last 90 days

On the 173 games both have graded (last 90 days), GPT-5.5 leads 108–106 on correct calls. The sharper cut is the 26 games where they took opposite sides: GPT-5.5 was right 14 of 26.

MLB · 148 games both graded · Jun 30 to Jul 11, 2026

GPT-5.5
87–61
59% on shared games
Claude Opus 4.8
85–63
57% on shared games
When they took opposite sides
24 of 148 shared games
GPT-5.5 13 · Claude Opus 4.8 11

On the 124 games they agreed, the shared side went 74–50.

UFC · 25 games both graded · Jul 11 to Jul 18, 2026

GPT-5.5
21–4
84% on shared games
Claude Opus 4.8
21–4
84% on shared games
When they took opposite sides
2 of 25 shared games
GPT-5.5 1 · Claude Opus 4.8 1

On the 23 games they agreed, the shared side went 20–3.

Closing-line value
GPT-5.5
+0.05 pp
beat the close 44.3% of 115 picks
Claude Opus 4.8
+0.23 pp
beat the close 56.1% of 285 picks

More head-to-heads

GPT-5.5 vs GLM 5.2 GPT-5.5 vs Gemini 3.5 Flash GPT-5.5 vs Grok 4.5 GPT-5.5 vs DeepSeek V4 Pro GPT-5.5 vs Claude Sonnet 5 GPT-5.5 vs GPT-5.6 Sol Pro GPT-5.5 vs GPT-5.6 Luna Pro GPT-5.5 vs Gemini 3.5 Flash Lite
Claude Opus 4.8 vs GLM 5.2 Claude Opus 4.8 vs Gemini 3.5 Flash Claude Opus 4.8 vs Grok 4.5 Claude Opus 4.8 vs DeepSeek V4 Pro Claude Opus 4.8 vs Claude Sonnet 5 Claude Opus 4.8 vs GPT-5.6 Sol Pro Claude Opus 4.8 vs GPT-5.6 Luna Pro Claude Opus 4.8 vs Gemini 3.5 Flash Lite

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.