GPT-OSS 20B vs Mistral Large 25.12
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-OSS 20B by OpenAI wins on 6 of 11 benchmarks against Mistral Large 25.12 by Mistral, which leads on 5. 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, Mistral Large 25.12 scores 9.7 on AA Intelligence Index compared to GPT-OSS 20B's 9.
Coding: In coding, GPT-OSS 20B scores 20.7 on AA Coding Index compared to Mistral Large 25.12's 20.1, while Mistral Large 25.12 scores 1117 on Design Arena ELO compared to GPT-OSS 20B's 906.
Reasoning: In reasoning, GPT-OSS 20B scores 66.5% on GPQA Diamond compared to Mistral Large 25.12's 52.0%, while Mistral Large 25.12 scores 2.4 on AA Agentic Index compared to GPT-OSS 20B's 1.4.
Context: In context, Mistral Large 25.12 scores 262K on Context Length compared to GPT-OSS 20B's 131K.
Pricing Comparison
GPT-OSS 20B costs $0.03/1M input tokens and $0.13/1M output tokens, while Mistral Large 25.12 costs $0.50/1M input and $1.5/1M output. GPT-OSS 20B is the more affordable option for API usage.
Speed Comparison
GPT-OSS 20B generates output at 312 tok/s compared to Mistral Large 25.12's 70 tok/s, and the time to first token is 470 ms for GPT-OSS 20B versus 380 ms for Mistral Large 25.12. 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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GPT-OSS 20B vs Mistral Large 25.12 — FAQ
Which is better, GPT-OSS 20B or Mistral Large 25.12?
GPT-OSS 20B wins on more benchmarks overall (6 vs 5). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-OSS 20B compare to Mistral Large 25.12 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is GPT-OSS 20B cheaper than Mistral Large 25.12?
Yes, GPT-OSS 20B is cheaper. GPT-OSS 20B costs $0.03/1M input and $0.13/1M output tokens. Mistral Large 25.12 costs $0.50/1M input and $1.5/1M output tokens.
Which is faster, GPT-OSS 20B or Mistral Large 25.12?
GPT-OSS 20B is faster, generating output at 312 tok/s compared to 70 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-OSS 20B vs Mistral Large 25.12 comparison cover?
This comparison covers 11 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.