GPT-5.5 vs Claude Sonnet 5: Graded Prediction Head-to-Head | Predicted Sports
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GPT-5.5 vs Claude Sonnet 5

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

All time Last 30 days Last 90 days

On the 153 games both have graded (all time), Claude Sonnet 5 leads 98–96 on correct calls. The sharper cut is the 16 games where they took opposite sides: Claude Sonnet 5 was right 9 of 16.

MLB · 128 games both graded · Jul 1 to Jul 11, 2026

GPT-5.5
75–53
59% on shared games
Claude Sonnet 5
76–52
59% on shared games
When they took opposite sides
15 of 128 shared games
GPT-5.5 7 · Claude Sonnet 5 8

On the 113 games they agreed, the shared side went 68–45.

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

GPT-5.5
21–4
84% on shared games
Claude Sonnet 5
22–3
88% on shared games
When they took opposite sides
1 of 25 shared games
GPT-5.5 0 · Claude Sonnet 5 1

On the 24 games they agreed, the shared side went 21–3.

Closing-line value
GPT-5.5
+0.05 pp
beat the close 44.3% of 115 picks
Claude Sonnet 5
+0.16 pp
beat the close 55.1% of 285 picks

More head-to-heads

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