Gemini 2.5 Pro vs Grok 4.1 Fast
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4.1 Fast by xAI wins on 9 of 14 benchmarks against Gemini 2.5 Pro by Google, which leads on 4. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Grok 4.1 Fast scores 1482 on Chatbot Arena ELO compared to Gemini 2.5 Pro's 1465, while Grok 4.1 Fast scores 87.0% on MMLU-Pro compared to Gemini 2.5 Pro's 84.0%.
Coding: In coding, Gemini 2.5 Pro scores 89.0% on HumanEval+ compared to Grok 4.1 Fast's 88.0%, while Gemini 2.5 Pro scores 63.8% on SWE-bench Verified compared to Grok 4.1 Fast's 60.0%, while Grok 4.1 Fast scores 62.0% on LiveCodeBench compared to Gemini 2.5 Pro's 58.0%.
Math: In math, Grok 4.1 Fast scores 89.0% on MATH compared to Gemini 2.5 Pro's 88.0%, while Grok 4.1 Fast scores 96.0% on GSM8K compared to Gemini 2.5 Pro's 95.5%.
Reasoning: In reasoning, Gemini 2.5 Pro scores 84.0% on GPQA Diamond compared to Grok 4.1 Fast's 72.0%, while both score 48.0% on ARC-AGI.
Context: In context, Gemini 2.5 Pro scores 1.0M on Context Length compared to Grok 4.1 Fast's 256K.
Pricing Comparison
Gemini 2.5 Pro costs $1.3/1M input tokens and $10.0/1M output tokens, while Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output. Grok 4.1 Fast is the more affordable option for API usage.
Speed Comparison
Gemini 2.5 Pro generates output at 55 tok/s compared to Grok 4.1 Fast's 120 tok/s, and the time to first token is 500 ms for Gemini 2.5 Pro versus 200 ms for Grok 4.1 Fast. Grok 4.1 Fast delivers faster throughput.
Verdict
For developers prioritizing coding, Gemini 2.5 Pro has the edge. For those who value general intelligence and math and affordability and speed, Grok 4.1 Fast is the stronger choice.
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Gemini 2.5 Pro vs Grok 4.1 Fast — FAQ
Which is better, Gemini 2.5 Pro or Grok 4.1 Fast?
Grok 4.1 Fast wins on more benchmarks overall (9 vs 4). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 2.5 Pro compare to Grok 4.1 Fast for coding?
Gemini 2.5 Pro is better for coding, scoring 63.8% on SWE-bench Verified compared to 60.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 2.5 Pro cheaper than Grok 4.1 Fast?
Yes, Grok 4.1 Fast is cheaper. Gemini 2.5 Pro costs $1.3/1M input and $10.0/1M output tokens. Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output tokens.
Which is faster, Gemini 2.5 Pro or Grok 4.1 Fast?
Grok 4.1 Fast is faster, generating output at 120 tok/s compared to 55 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 2.5 Pro vs Grok 4.1 Fast comparison cover?
This comparison covers 14 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, LiveCodeBench, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.