GPT OSS 20B vs GPT-5.2
GPT OSS 20B is cheaper on output tokens, while GPT-5.2 offers a larger context window. Choose GPT OSS 20B or GPT-5.2 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT OSS 20B | GPT-5.2 |
|---|---|---|
| Provider | Neon | OpenAI |
| Input / 1M tokens | $0.07 | $1.75 |
| Output / 1M tokens | $0.30 | $14.00 |
| Context window | 131K | 400K |
| Parameters | 21B | — |
| Open weights | Yes | No |
| Released | Aug 2025 | Dec 2025 |
| LiveBench score | — | 75.4 |
| SWE-bench Multilingual score | — | 66.7 |
| SWE-bench Verified score | — | 72.8 |
| GPQA Diamond score | — | 91.4 |
| LMArena (Chatbot Arena) Elo score | — | 1416 |
| LMArena WebDev Elo score | — | 1417 |
| LMArena Vision Elo score | — | 1246 |
| FrontierMath score | — | 40.7 |
| Epoch Capabilities Index score | — | 154 |
FAQ
Is GPT OSS 20B or GPT-5.2 cheaper?
GPT OSS 20B is cheaper on output tokens ($0.30 vs $14.00 per 1M).
Which has the larger context window, GPT OSS 20B or GPT-5.2?
GPT-5.2 has the larger context window (400K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.