Gemini 3.1 Pro vs Grok 4.1 Fast
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 3.1 Pro by Google wins on 10 of 14 benchmarks against Grok 4.1 Fast by xAI, which leads on 4. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from the AI Value Index.
Category-by-Category Breakdown
General Intelligence: In general intelligence, Gemini 3.1 Pro scores 1501 on Chatbot Arena ELO compared to Grok 4.1 Fast's 1482, while Gemini 3.1 Pro scores 92.6% on MMLU-Pro compared to Grok 4.1 Fast's 87.0%.
Coding: In coding, Gemini 3.1 Pro scores 93.0% on HumanEval+ compared to Grok 4.1 Fast's 88.0%, while Gemini 3.1 Pro scores 80.6% on SWE-bench Verified compared to Grok 4.1 Fast's 60.0%, while Gemini 3.1 Pro scores 75.0% on LiveCodeBench compared to Grok 4.1 Fast's 62.0%.
Math: In math, Gemini 3.1 Pro scores 93.0% on MATH compared to Grok 4.1 Fast's 89.0%, while Gemini 3.1 Pro scores 98.0% on GSM8K compared to Grok 4.1 Fast's 96.0%.
Reasoning: In reasoning, Gemini 3.1 Pro scores 94.1% on GPQA Diamond compared to Grok 4.1 Fast's 72.0%, while Gemini 3.1 Pro scores 77.1% on ARC-AGI compared to Grok 4.1 Fast's 48.0%.
Context: In context, Gemini 3.1 Pro scores 1.0M on Context Length compared to Grok 4.1 Fast's 256K.
Pricing Comparison
Gemini 3.1 Pro costs $2.0/1M input tokens and $12.0/1M 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 3.1 Pro generates output at 65 tok/s compared to Grok 4.1 Fast's 120 tok/s, and the time to first token is 420 ms for Gemini 3.1 Pro versus 200 ms for Grok 4.1 Fast. Grok 4.1 Fast delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence and math, Gemini 3.1 Pro has the edge. For those who value affordability and speed, Grok 4.1 Fast is the stronger choice.
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Gemini 3.1 Pro vs Grok 4.1 Fast — FAQ
Which is better, Gemini 3.1 Pro or Grok 4.1 Fast?
Gemini 3.1 Pro wins on more benchmarks overall (10 vs 4). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 3.1 Pro compare to Grok 4.1 Fast for coding?
Gemini 3.1 Pro is better for coding, scoring 80.6% on SWE-bench Verified compared to 60.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 3.1 Pro cheaper than Grok 4.1 Fast?
Yes, Grok 4.1 Fast is cheaper. Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output tokens. Grok 4.1 Fast costs $0.20/1M input and $0.50/1M output tokens.
Which is faster, Gemini 3.1 Pro or Grok 4.1 Fast?
Grok 4.1 Fast is faster, generating output at 120 tok/s compared to 65 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 3.1 Pro vs Grok 4.1 Fast comparison cover?
This comparison covers 14 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, Time to First Token, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.