Claude Opus 4.5 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 15 of 16 benchmarks against Claude Opus 4.5 by Anthropic, which leads on 1. 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 Claude Opus 4.5's 1468, while Gemini 3.1 Pro scores 92.6% on MMLU-Pro compared to Claude Opus 4.5's 89.5%, while Gemini 3.1 Pro scores 92.0% on IFEval compared to Claude Opus 4.5's 90.0%.
Coding: In coding, Gemini 3.1 Pro scores 93.0% on HumanEval+ compared to Claude Opus 4.5's 92.0%, while Claude Opus 4.5 scores 80.9% on SWE-bench Verified compared to Gemini 3.1 Pro's 80.6%, while Gemini 3.1 Pro scores 75.0% on LiveCodeBench compared to Claude Opus 4.5's 70.0%.
Math: In math, Gemini 3.1 Pro scores 93.0% on MATH compared to Claude Opus 4.5's 90.0%, while Gemini 3.1 Pro scores 98.0% on GSM8K compared to Claude Opus 4.5's 96.5%, while Gemini 3.1 Pro scores 95.0% on AIME 2025 compared to Claude Opus 4.5's 72.0%.
Reasoning: In reasoning, Gemini 3.1 Pro scores 94.1% on GPQA Diamond compared to Claude Opus 4.5's 87.0%, while Gemini 3.1 Pro scores 77.1% on ARC-AGI compared to Claude Opus 4.5's 57.0%.
Context: In context, Gemini 3.1 Pro scores 1.0M on Context Length compared to Claude Opus 4.5's 200K.
Pricing Comparison
Claude Opus 4.5 costs $5.0/1M input tokens and $25.0/1M output tokens, while Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output. Gemini 3.1 Pro is the more affordable option for API usage.
Speed Comparison
Claude Opus 4.5 generates output at 50 tok/s compared to Gemini 3.1 Pro's 65 tok/s, and the time to first token is 1700 ms for Claude Opus 4.5 versus 420 ms for Gemini 3.1 Pro. Gemini 3.1 Pro delivers faster throughput.
Verdict
For developers prioritizing coding, Claude Opus 4.5 has the edge. For those who value general intelligence and math and affordability and speed, Gemini 3.1 Pro is the stronger choice.
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Claude Opus 4.5 vs Gemini 3.1 Pro — FAQ
Which is better, Claude Opus 4.5 or Gemini 3.1 Pro?
Gemini 3.1 Pro wins on more benchmarks overall (15 vs 1). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.5 compare to Gemini 3.1 Pro for coding?
Claude Opus 4.5 is better for coding, scoring 80.9% on SWE-bench Verified compared to 80.6%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Opus 4.5 cheaper than Gemini 3.1 Pro?
Yes, Gemini 3.1 Pro is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output tokens.
Which is faster, Claude Opus 4.5 or Gemini 3.1 Pro?
Gemini 3.1 Pro is faster, generating output at 65 tok/s compared to 50 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Opus 4.5 vs Gemini 3.1 Pro comparison cover?
This comparison covers 16 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.