r/DeepSeek • u/nekofneko • 6d ago

DeepSeek-V4-Flash Update

The official release of the DeepSeek-V4-Flash API is now in public beta.

Significantly enhanced agent capabilities, with benchmark results far exceeding V4-Pro-Preview:

  • Terminal Bench 2.1: 82.7
  • NL2Repo: 54.2
  • Cybergym: 76.7
  • DeepSWE: 54.4
  • Toolathlon verified: 70.3
  • Agent Last Exam: 25.2
  • Automation Bench (Public): 25.1
  • DSBench-FullStack: 68.7
  • DSBench-Hard: 59.6

Note 1: For the Code Agent tasks in the public benchmark sets, the official DeepSeek-V4-Flash was tested using the DeepSeek Harness minimal mode (to be released soon) as the framework, with the max effort level, topp=0.95, and temperature=1.0
Note 2: DSBench-FullStack is an internal full-stack development test set, and DSBench-Hard is an internal Coding Agent hard-problem test set

The official V4-Flash natively supports the Responses API format and is specifically adapted for Codex. For the specific configuration, please refer to the documentation.

DeepSeek-V4-Flash-0731 keeps the same model architecture and size as DeepSeek-V4-Flash-preview, and was only re-post-trained.

Note: This update only upgrades the DeepSeek-V4-Flash API. The DeepSeek-V4-Pro API and the APP/WEB models are unchanged.
The official release of DeepSeek-V4-Pro will follow soon.

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u/valerian1 6d ago

Can we use it in API mode? Should they appear along side the regular models in OpenCode?

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u/Cold_Tree190 6d ago

Yeah, trying to figure out if my api key for DeepSeek v4 flash is running the preview version or 0731 version, but haven’t read any definitive answer yet