# DeepSeek-V4.1-Flash-1017



DeepSeek



The October 17 update of V4.1 Flash. DeepSeek reports HLE \(no tools\) 42.6, Terminal-Bench 4.0 42.3, DeepSWE v1.1 77.0, ProgramBench 29.1 and NL2Repo-Bench 68.2, with shorter runtimes and outputs. It is tuned for DeepSeek Harness, Tencent CodeBuddy and WorkBuddy; DeepSeek recommends Harness 0.2.1-rc.1 or later. DeepSeek announced it on X at 16:35 Beijing time on October 17, 2026 and released the open weights, saying reinforcement learning with self-feedback improves end-to-end project building.


## Availability

API model name deepseek-flash \(same calling method and pricing\); live on the official DeepSeek web app and mobile app; open weights on Hugging Face and ModelScope; live on OpenRouter with DeepSeek as the first provider, and supported across the Qoder suite; the legacy names deepseek-v4-flash and deepseek-v4-flash-vision-exp also route here at Flash pricing
- Model released: Oct 17, 2026 · Date only
- Review updated: Oct 18, 2026 10:43 Sun · Beijing Time (UTC+8)

## Sources

- Source excerpt: https://api-docs.deepseek.com/updates
- Source excerpt: https://x.com/deepseek_ai/status/2111375640717033777
- Source excerpt: https://x.com/deepseek_ai/status/2111375653069259247
- Source excerpt: https://x.com/OpenRouter/status/2111377421404651714
- Source excerpt: https://x.com/qoder_ai_ide/status/2111394881994416243

Canonical entry: https://www.ailyre.com/source/?id=deepseek-deepseek-v4-1-flash-1017&lang=en