Gemini 2.5 Pro vs Gemini 3.1 Pro
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 3.1 Pro by Google wins on 12 of 15 benchmarks against Gemini 2.5 Pro by Google, which leads on 3. 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 Gemini 2.5 Pro's 1465, while Gemini 3.1 Pro scores 92.6% on MMLU-Pro compared to Gemini 2.5 Pro's 84.0%, while Gemini 3.1 Pro scores 92.0% on IFEval compared to Gemini 2.5 Pro's 88.0%.
Coding: In coding, Gemini 3.1 Pro scores 93.0% on HumanEval+ compared to Gemini 2.5 Pro's 89.0%, while Gemini 3.1 Pro scores 80.6% on SWE-bench Verified compared to Gemini 2.5 Pro's 63.8%, while Gemini 3.1 Pro scores 75.0% on LiveCodeBench compared to Gemini 2.5 Pro's 58.0%.
Math: In math, Gemini 3.1 Pro scores 93.0% on MATH compared to Gemini 2.5 Pro's 88.0%, while Gemini 3.1 Pro scores 98.0% on GSM8K compared to Gemini 2.5 Pro's 95.5%.
Reasoning: In reasoning, Gemini 3.1 Pro scores 94.1% on GPQA Diamond compared to Gemini 2.5 Pro's 84.0%, while Gemini 3.1 Pro scores 77.1% on ARC-AGI compared to Gemini 2.5 Pro's 48.0%.
Context: In context, Gemini 2.5 Pro scores 1.0M on Context Length compared to Gemini 3.1 Pro's 1.0M.
Pricing Comparison
Gemini 2.5 Pro costs $1.3/1M input tokens and $10.0/1M output tokens, while Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output. Gemini 2.5 Pro is the more affordable option for API usage.
Speed Comparison
Gemini 2.5 Pro generates output at 55 tok/s compared to Gemini 3.1 Pro's 65 tok/s, and the time to first token is 500 ms for Gemini 2.5 Pro versus 420 ms for Gemini 3.1 Pro. Gemini 3.1 Pro delivers faster throughput.
Verdict
For developers prioritizing affordability, Gemini 2.5 Pro has the edge. For those who value coding and general intelligence and math and speed, Gemini 3.1 Pro is the stronger choice.
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Gemini 2.5 Pro vs Gemini 3.1 Pro — FAQ
Which is better, Gemini 2.5 Pro or Gemini 3.1 Pro?
Gemini 3.1 Pro wins on more benchmarks overall (12 vs 3). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 2.5 Pro compare to Gemini 3.1 Pro for coding?
Gemini 3.1 Pro is better for coding, scoring 80.6% on SWE-bench Verified compared to 63.8%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 2.5 Pro cheaper than Gemini 3.1 Pro?
Yes, Gemini 2.5 Pro is cheaper. Gemini 2.5 Pro costs $1.3/1M input and $10.0/1M output tokens. Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output tokens.
Which is faster, Gemini 2.5 Pro or Gemini 3.1 Pro?
Gemini 3.1 Pro is faster, generating output at 65 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 Gemini 3.1 Pro comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, IFEval, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.