Who is better at picking games, Claude Opus 4.8 or Grok 4.3?

On the 181 games both have graded, Claude Opus 4.8 leads with 106 wins to 103. Every pick is made before the game and graded in public against the final result.

How often do Claude Opus 4.8 and Grok 4.3 disagree?

They took opposite sides on 41 of the 181 shared games, and Claude Opus 4.8 was right 22 of those 41 times.

← All head-to-heads

Head-to-head

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 30 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 · Jun 30 to Jul 25, 2026

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 74–55.

UFC · 13 games both graded · Jul 11 to Jul 11, 2026

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 10–1.

Closing-line value

Claude Opus 4.8

+0.23 pp

beat the close 56.1% of 285 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 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

Grok 4.3 vs GLM 5.2 Grok 4.3 vs Gemini 3.5 Flash 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 Sol Pro Grok 4.3 vs GPT-5.6 Luna Pro Grok 4.3 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.