Claude Opus 4.8 vs Grok 4.3: Graded Prediction Head-to-Head | Predicted Sports
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Claude Opus 4.8 vs Grok 4.3

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

All time Last 30 days Last 90 days

On the 181 games both have graded (last 90 days), Claude Opus 4.8 leads 106–103 on correct calls. The sharper cut is the 41 games where they took opposite sides: Claude Opus 4.8 was right 22 of 41.

MLB · 168 games both graded · to

Claude Opus 4.8
95–73
57% on shared games
Grok 4.3
92–76
55% on shared games
When they took opposite sides
39 of 168 shared games
Claude Opus 4.8 21 · Grok 4.3 18

On the 129 games they agreed, the shared side went –.

UFC · 13 games both graded · to

Claude Opus 4.8
11–2
85% on shared games
Grok 4.3
11–2
85% on shared games
When they took opposite sides
2 of 13 shared games
Claude Opus 4.8 1 · Grok 4.3 1

On the 11 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
Grok 4.3
-0.07 pp
beat the close 41.5% of 135 picks

More head-to-heads

Claude Opus 4.8 vs GLM 5.2 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 Luna Pro Claude Opus 4.8 vs GLM 5.3 Claude Opus 4.8 vs Gemini 3.6 Flash Claude Opus 4.8 vs Gemini 3.7 Flash
Grok 4.3 vs GLM 5.2 Grok 4.3 vs Grok 4.5 Grok 4.3 vs DeepSeek V4 Pro Grok 4.3 vs Claude Sonnet 5 Grok 4.3 vs GPT-5.6 Luna Pro Grok 4.3 vs GLM 5.3 Grok 4.3 vs Gemini 3.6 Flash Grok 4.3 vs Gemini 3.7 Flash

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.