token.app › Compare › gpt-oss-20b vs DeepSeek V4 Flash 0731
gpt-oss-20b vs DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 leads on 2 of 2 shared benchmarks. gpt-oss-20b is 18× 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-oss-20b | DeepSeek V4 Flash 0731 | |
|---|---|---|
| Provider | OpenAI | DeepSeek |
| Input $/1M | $0.018 | $0.440 |
| Output $/1M | $0.090 | $1.32 |
| Blended $/1M | $0.036 | $0.660 |
| Context window | 131K | 1.0M |
| Max output | 33K | 131K |
| Released | Aug 2025 | Jul 2026 |
| Licence | Open weights | Open weights |
| GPQA Diamond | 60.8% | 91.0% |
| OTIS Mock AIME | 65.3% | 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-oss-20b if…
- Costs less per token — $0.036 vs $0.660 blended
Choose DeepSeek V4 Flash 0731 if…
- Higher GPQA Diamond (91.0% vs 60.8%)
- Higher OTIS Mock AIME (94.4% vs 65.3%)
- Larger context window (1.0M)
- Newer model (released Jul 2026)
FAQ
Which is better, gpt-oss-20b or DeepSeek V4 Flash 0731?
Across the 2 benchmarks both models have independently-run scores for, gpt-oss-20b leads on 0 and DeepSeek V4 Flash 0731 leads on 2. Benchmarks are one input — price and context window are on this page too.
Is gpt-oss-20b cheaper than DeepSeek V4 Flash 0731?
gpt-oss-20b is cheaper: $0.036 versus $0.660 per million tokens blended at 3:1 input:output. Input alone: $0.018 vs $0.440. Output alone: $0.090 vs $1.32.
What context windows do gpt-oss-20b and DeepSeek V4 Flash 0731 have?
gpt-oss-20b: 131,072 tokens. DeepSeek V4 Flash 0731: 1,048,576 tokens.
Who makes gpt-oss-20b and DeepSeek V4 Flash 0731?
gpt-oss-20b is made by OpenAI. DeepSeek V4 Flash 0731 is made by DeepSeek.