Gemini 3.1 Pro vs GPT-4.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 3.1 Pro by Google wins on 15 of 15 benchmarks against GPT-4.5 by OpenAI, which leads on 0. 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 GPT-4.5's 1310, while Gemini 3.1 Pro scores 92.6% on MMLU-Pro compared to GPT-4.5's 78.0%, while Gemini 3.1 Pro scores 92.0% on IFEval compared to GPT-4.5's 86.0%.
Coding: In coding, Gemini 3.1 Pro scores 93.0% on HumanEval+ compared to GPT-4.5's 88.0%, while Gemini 3.1 Pro scores 80.6% on SWE-bench Verified compared to GPT-4.5's 38.0%, while Gemini 3.1 Pro scores 75.0% on LiveCodeBench compared to GPT-4.5's 45.0%.
Math: In math, Gemini 3.1 Pro scores 93.0% on MATH compared to GPT-4.5's 82.0%, while Gemini 3.1 Pro scores 98.0% on GSM8K compared to GPT-4.5's 94.0%.
Reasoning: In reasoning, Gemini 3.1 Pro scores 94.1% on GPQA Diamond compared to GPT-4.5's 71.4%, while Gemini 3.1 Pro scores 77.1% on ARC-AGI compared to GPT-4.5's 20.0%.
Context: In context, Gemini 3.1 Pro scores 1.0M on Context Length compared to GPT-4.5's 128K.
Pricing Comparison
Gemini 3.1 Pro costs $2.0/1M input tokens and $12.0/1M output tokens, while GPT-4.5 costs $75.0/1M input and $150.0/1M output. Gemini 3.1 Pro is the more affordable option for API usage.
Speed Comparison
Gemini 3.1 Pro generates output at 65 tok/s compared to GPT-4.5's 60 tok/s, and the time to first token is 420 ms for Gemini 3.1 Pro versus 600 ms for GPT-4.5. Gemini 3.1 Pro delivers faster throughput.
Verdict
Gemini 3.1 Pro leads across the board in coding, general intelligence, math, affordability, speed, making it the stronger overall choice in this comparison.
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Gemini 3.1 Pro vs GPT-4.5 — FAQ
Which is better, Gemini 3.1 Pro or GPT-4.5?
Gemini 3.1 Pro wins on more benchmarks overall (15 vs 0). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 3.1 Pro compare to GPT-4.5 for coding?
Gemini 3.1 Pro is better for coding, scoring 80.6% on SWE-bench Verified compared to 38.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 3.1 Pro cheaper than GPT-4.5?
Yes, Gemini 3.1 Pro is cheaper. Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output tokens. GPT-4.5 costs $75.0/1M input and $150.0/1M output tokens.
Which is faster, Gemini 3.1 Pro or GPT-4.5?
Gemini 3.1 Pro is faster, generating output at 65 tok/s compared to 60 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 3.1 Pro vs GPT-4.5 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.