DeepSeek V3.1 vs GPT-5 Nano
GPT-5 Nano is cheaper on output tokens, while GPT-5 Nano offers a larger context window. Choose DeepSeek V3.1 or GPT-5 Nano based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | DeepSeek V3.1 | GPT-5 Nano |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Input / 1M tokens | $0.25 | $0.05 |
| Output / 1M tokens | $0.95 | $0.40 |
| Context window | 164K | 400K |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Aug 2025 |
| LMArena (Chatbot Arena) Elo score | 1420 | 1320 |
| Epoch Capabilities Index score | 140 | 139 |
| LiveBench score | — | 48.8 |
| SWE-bench Verified score | — | 34.8 |
| LMArena Vision Elo score | — | 1159 |
| GPQA Diamond score | — | 69.4 |
| FrontierMath score | — | 8.3 |
FAQ
Is DeepSeek V3.1 or GPT-5 Nano cheaper?
GPT-5 Nano is cheaper on output tokens ($0.40 vs $0.95 per 1M).
Which has the larger context window, DeepSeek V3.1 or GPT-5 Nano?
GPT-5 Nano 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.