Pyyan / Compare / gpt-oss-20b vs DeepSeek V4.1 Flash
gpt-oss-20b vs DeepSeek V4.1 Flash
2 of 5Open-Weight Models · verified 13 Sept 2026
gpt-oss-20bOpenAIcurrentDeepSeek V4.1 FlashDeepSeekcurrent
| Specification | gpt-oss-20b | DeepSeek V4.1 Flash |
|---|---|---|
| Summary | Smaller open-weight release. | Twice the parameters of the Flash it replaces, and cheaper to run. |
| Context | — | 1M |
| Input ($/Mtok) | — | $0.3 |
| Output ($/Mtok) | — | $1.2 |
| Licence | Open weights | MIT |
| Max output | — | 256K |
| Parameters | 20B | 552B total, 8B / 16B active |
| Released | Aug 2025 | 10 Sep 2026 |
| Model ID | — | deepseek-flash |
| Category | Open-Weight Models | Open-Weight Models |
| Official | OpenAI ↗ | DeepSeek ↗ |
Highlighted rows are where these differ.
DeepSeek V4.1 Flash
- 552B total, 8B active while reading the prompt and 16B while generating, with a 1M token context
- DeepSeek says it beats V4-Pro; V4-Pro requests route to it from 14 September 2026
- MIT licence, native image input, and a KV cache about a quarter the size of V4-Flash's
Best for cheap agentic coding with images.