Gemini 3 Pro vs GPT-OSS 20B
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Gemini 3 Pro by Google wins on 5 of 8 benchmarks against GPT-OSS 20B 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
Coding: In coding, Gemini 3 Pro scores 1259 on Design Arena ELO compared to GPT-OSS 20B's 906, while Gemini 3 Pro scores 1265 on Website Arena ELO compared to GPT-OSS 20B's 865.
Reasoning: In reasoning, Gemini 3 Pro scores 91.9% on GPQA Diamond compared to GPT-OSS 20B's 66.5%.
Context: In context, Gemini 3 Pro scores 1.0M on Context Length compared to GPT-OSS 20B's 131K.
Pricing Comparison
Gemini 3 Pro costs $2.0/1M input tokens and $12.0/1M output tokens, while GPT-OSS 20B costs $0.03/1M input and $0.13/1M output. GPT-OSS 20B is the more affordable option for API usage.
Speed Comparison
Gemini 3 Pro generates output at 60 tok/s compared to GPT-OSS 20B's 312 tok/s, and the time to first token is 450 ms for Gemini 3 Pro versus 470 ms for GPT-OSS 20B. GPT-OSS 20B delivers faster throughput.
Verdict
GPT-OSS 20B leads across the board in affordability, speed, making it the stronger overall choice in this comparison.
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Gemini 3 Pro vs GPT-OSS 20B — FAQ
Which is better, Gemini 3 Pro or GPT-OSS 20B?
Gemini 3 Pro wins on more benchmarks overall (5 vs 3). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 3 Pro compare to GPT-OSS 20B 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 Pro cheaper than GPT-OSS 20B?
Yes, GPT-OSS 20B is cheaper. Gemini 3 Pro costs $2.0/1M input and $12.0/1M output tokens. GPT-OSS 20B costs $0.03/1M input and $0.13/1M output tokens.
Which is faster, Gemini 3 Pro or GPT-OSS 20B?
GPT-OSS 20B is faster, generating output at 312 tok/s compared to 60 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 3 Pro vs GPT-OSS 20B comparison cover?
This comparison covers 8 benchmarks including GPQA Diamond, Output Speed, Time to First Token, Input Cost, Output Cost, Context Length, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.