GPT-5.2 vs GPT-OSS 120B
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.2 by OpenAI wins on 6 of 9 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
Coding: In coding, GPT-5.2 scores 1173 on Design Arena ELO compared to GPT-OSS 120B's 974, while GPT-5.2 scores 1167 on Website Arena ELO compared to GPT-OSS 120B's 980.
Reasoning: In reasoning, GPT-5.2 scores 87.9% on GPQA Diamond compared to GPT-OSS 120B's 74.9%, while GPT-5.2 scores 73.3% on τ²-Bench Airline compared to GPT-OSS 120B's 64.1%.
Context: In context, GPT-5.2 scores 400K on Context Length compared to GPT-OSS 120B's 131K.
Pricing Comparison
GPT-5.2 costs $1.8/1M input tokens and $14.0/1M 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
GPT-5.2 generates output at 90 tok/s compared to GPT-OSS 120B's 339 tok/s, and the time to first token is 380 ms for GPT-5.2 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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GPT-5.2 vs GPT-OSS 120B — FAQ
Which is better, GPT-5.2 or GPT-OSS 120B?
GPT-5.2 wins on more benchmarks overall (6 vs 3). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.2 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 GPT-5.2 cheaper than GPT-OSS 120B?
Yes, GPT-OSS 120B is cheaper. GPT-5.2 costs $1.8/1M input and $14.0/1M output tokens. GPT-OSS 120B costs $0.04/1M input and $0.17/1M output tokens.
Which is faster, GPT-5.2 or GPT-OSS 120B?
GPT-OSS 120B is faster, generating output at 339 tok/s compared to 90 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-5.2 vs GPT-OSS 120B comparison cover?
This comparison covers 9 benchmarks including GPQA Diamond, Output Speed, Time to First Token, Input Cost, Output Cost, Context Length, Design Arena ELO, τ²-Bench Airline, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.