DeepSeek-V4.1-Flash by DeepSeek: released Sep 10, 2026; 552B backbone parameters; 1M-token context; open weights under MIT; API available outside China; list price $0.30 input (cache miss) / $1.20 output per 1M tokens at peak; off-peak half price (API model deepseek-flash).
Verified facts
- Outside China
- Global API · verified Sep 29, 2026 · Evidence
- Open weights
- Yes · verified Sep 29, 2026 · Evidence
- License
- MIT · verified Sep 29, 2026 · Evidence
- Claim status
- Company-reported · verified Sep 29, 2026 · Evidence
- Parameters
- 552B backbone · verified Sep 29, 2026 · Evidence
- Context window
- 1,000,000 tokens · verified Sep 29, 2026 · Evidence
- List price
- $0.30 input (cache miss) / $1.20 output per 1M tokens at peak; off-peak half price (API model deepseek-flash) · verified Sep 29, 2026 · Evidence
- Hugging Face
- deepseek-ai/DeepSeek-V4.1-Flash · verified Sep 29, 2026
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