Gemini 3.1 Pro vs GPT-OSS 120B
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 3.1 Pro by Google wins on 9 of 12 benchmarks against GPT-OSS 120B by OpenAI, which leads on 3. 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, Gemini 3.1 Pro scores 30.4 on AA Intelligence Index compared to GPT-OSS 120B's 12.3.
Coding: In coding, Gemini 3.1 Pro scores 68.8 on AA Coding Index compared to GPT-OSS 120B's 30.4, while Gemini 3.1 Pro scores 1256 on Design Arena ELO compared to GPT-OSS 120B's 974, while Gemini 3.1 Pro scores 1246 on Website Arena ELO compared to GPT-OSS 120B's 980.
Reasoning: In reasoning, Gemini 3.1 Pro scores 94.4% on GPQA Diamond compared to GPT-OSS 120B's 74.9%, while Gemini 3.1 Pro scores 10.3 on AA Agentic Index compared to GPT-OSS 120B's 6.2, while Gemini 3.1 Pro scores 75.3% on τ²-Bench Airline compared to GPT-OSS 120B's 64.1%.
Context: In context, Gemini 3.1 Pro scores 1.0M on Context Length compared to GPT-OSS 120B's 131K.
Pricing Comparison
Gemini 3.1 Pro costs $2.0/1M input tokens and $12.0/1M output tokens, while GPT-OSS 120B costs $0.04/1M input and $0.17/1M output. GPT-OSS 120B is the more affordable option for API usage.
Speed Comparison
Gemini 3.1 Pro generates output at 65 tok/s compared to GPT-OSS 120B's 339 tok/s, and the time to first token is 420 ms for Gemini 3.1 Pro versus 440 ms for GPT-OSS 120B. GPT-OSS 120B delivers faster throughput.
Verdict
GPT-OSS 120B leads across the board in affordability, speed, making it the stronger overall choice in this comparison.
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Gemini 3.1 Pro vs GPT-OSS 120B — FAQ
Which is better, Gemini 3.1 Pro or GPT-OSS 120B?
Gemini 3.1 Pro wins on more benchmarks overall (9 vs 3). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 3.1 Pro compare to GPT-OSS 120B for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Gemini 3.1 Pro cheaper than GPT-OSS 120B?
Yes, GPT-OSS 120B is cheaper. Gemini 3.1 Pro costs $2.0/1M input and $12.0/1M output tokens. GPT-OSS 120B costs $0.04/1M input and $0.17/1M output tokens.
Which is faster, Gemini 3.1 Pro or GPT-OSS 120B?
GPT-OSS 120B is faster, generating output at 339 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 GPT-OSS 120B comparison cover?
This comparison covers 12 benchmarks including GPQA Diamond, Output Speed, Time to First Token, Input Cost, Output Cost, Context Length, AA Intelligence Index, AA Coding Index, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.