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Gemini 2.5 Pro vs Grok 4 Fast

3 vs 0 benchmarks won

Google
Gemini 2.5 Pro
xAI
Grok 4 Fast
Overview
CompanyGooglexAI
Release dateMar 25 2025Sep 2025
Model type
Open sourceNoNo
Specifications
Parameters
Context window
Benchmarks
Science reasoning
GPQA Diamond
86.4%
Software engineering
SWE-Bench Verified
59.6%
Multimodal understanding
MMMU
68%
Timeline
Release gapGemini 2.5 Pro shipped 160 days before Grok 4 Fast

Which is better: Gemini 2.5 Pro or Grok 4 Fast?

Gemini 2.5 Pro leads Grok 4 Fast on 3 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Gemini 2.5 Pro shipped 160 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.

Published specifications for these two models are limited — see each model page for the latest details.

Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.

Frequently asked questions

When was Gemini 2.5 Pro released?
Gemini 2.5 Pro was released by Google on Mar 25 2025.
When was Grok 4 Fast released?
Grok 4 Fast was released by xAI on Sep 2025.

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