token.app › Compare › GPT-5 Nano vs DeepSeek V4 Flash 0731
GPT-5 Nano vs DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 leads on 5 of 5 shared benchmarks. DeepSeek V4 Flash 0731 is 1.2× cheaper per token on a blended 3:1 basis. DeepSeek V4 Flash 0731 accepts the larger context window (1.0M).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-5 Nano | DeepSeek V4 Flash 0731 | |
|---|---|---|
| Provider | OpenAI | DeepSeek |
| Input $/1M | $0.050 | $0.090 |
| Output $/1M | $0.400 | $0.180 |
| Blended $/1M | $0.138 | $0.113 |
| Context window | 400K | 1.0M |
| Max output | 128K | 384K |
| Released | Aug 2025 | Jul 2026 |
| Licence | Proprietary | Open weights |
| GPQA Diamond | 69.4% | 91.0% |
| FrontierMath T1–3 | 20.0% | 57.5% |
| FrontierMath T4 | 2.4% | 24.4% |
| SimpleQA Verified | 12.2% | 34.7% |
| OTIS Mock AIME | 81.1% | 94.4% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose GPT-5 Nano if…
- No clear advantage on the data we hold.
Choose DeepSeek V4 Flash 0731 if…
- Costs less per token — $0.113 vs $0.138 blended
- Higher GPQA Diamond (91.0% vs 69.4%)
- Higher FrontierMath T1–3 (57.5% vs 20.0%)
- Higher FrontierMath T4 (24.4% vs 2.4%)
- Higher SimpleQA Verified (34.7% vs 12.2%)
- Larger context window (1.0M)
- Open weights — self-hostable
- Newer model (released Jul 2026)
FAQ
Which is better, GPT-5 Nano or DeepSeek V4 Flash 0731?
Across the 5 benchmarks both models have independently-run scores for, GPT-5 Nano leads on 0 and DeepSeek V4 Flash 0731 leads on 5. Benchmarks are one input — price and context window are on this page too.
Is GPT-5 Nano cheaper than DeepSeek V4 Flash 0731?
DeepSeek V4 Flash 0731 is cheaper: $0.113 versus $0.138 per million tokens blended at 3:1 input:output. Input alone: $0.050 vs $0.090. Output alone: $0.400 vs $0.180.
What context windows do GPT-5 Nano and DeepSeek V4 Flash 0731 have?
GPT-5 Nano: 400,000 tokens. DeepSeek V4 Flash 0731: 1,048,576 tokens.
Who makes GPT-5 Nano and DeepSeek V4 Flash 0731?
GPT-5 Nano is made by OpenAI. DeepSeek V4 Flash 0731 is made by DeepSeek.