token.app › Compare › Gemini 3.1 Pro Preview vs Grok 4.5

Gemini 3.1 Pro Preview vs Grok 4.5

Gemini 3.1 Pro Preview leads on 4 of 5 shared benchmarks. Grok 4.5 is 1.5× cheaper per token on a blended 3:1 basis. Gemini 3.1 Pro Preview accepts the larger context window (1.0M).

Head to head
Blended price uses a 3:1 input:output mix
Gemini 3.1 Pro PreviewGrok 4.5
ProviderGooglexAI
Input $/1M$2.00$2.00
Output $/1M$12.00$6.00
Blended $/1M$4.50$3.00
Context window1.0M500K
Max output66K—
ReleasedFeb 2026Jul 2026
LicenceProprietaryProprietary
GPQA Diamond 94.4% 93.4%
FrontierMath T1–3 59.6% 57.2%
FrontierMath T4 26.8% 24.4%
SimpleQA Verified 77.3% 53.5%
OTIS Mock AIME 95.6% 97.8%
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose Gemini 3.1 Pro Preview if…
  • Higher GPQA Diamond (94.4% vs 93.4%)
  • Higher FrontierMath T1–3 (59.6% vs 57.2%)
  • Higher FrontierMath T4 (26.8% vs 24.4%)
  • Higher SimpleQA Verified (77.3% vs 53.5%)
  • Larger context window (1.0M)
Choose Grok 4.5 if…
  • Costs less per token — $3.00 vs $4.50 blended
  • Higher OTIS Mock AIME (97.8% vs 95.6%)
  • Newer model (released Jul 2026)
FAQ
Which is better, Gemini 3.1 Pro Preview or Grok 4.5?
Across the 5 benchmarks both models have independently-run scores for, Gemini 3.1 Pro Preview leads on 4 and Grok 4.5 leads on 1. Benchmarks are one input — price and context window are on this page too.
Is Gemini 3.1 Pro Preview cheaper than Grok 4.5?
Grok 4.5 is cheaper: $3.00 versus $4.50 per million tokens blended at 3:1 input:output. Input alone: $2.00 vs $2.00. Output alone: $12.00 vs $6.00.
What context windows do Gemini 3.1 Pro Preview and Grok 4.5 have?
Gemini 3.1 Pro Preview: 1,048,576 tokens. Grok 4.5: 500,000 tokens.
Who makes Gemini 3.1 Pro Preview and Grok 4.5?
Gemini 3.1 Pro Preview is made by Google. Grok 4.5 is made by xAI.
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