DeepSeek V4 Flash enters public API testing with the 0731 release
DeepSeek releases the V4 Flash 0731 API release, with post-training that substantially improves agent capabilities and native support for the Responses API and Codex.
What happened
Event details
DeepSeek-V4-Flash-0731 keeps the preview model's architecture and scale and changes only the post-training. DeepSeek reports scores of 82.7 on Terminal Bench 2.1, 54.2 on NL2Repo and 54.4 on DeepSWE, and says agent capabilities substantially exceed those of V4 Pro Preview. The update applies only to the API; the model name remains deepseek-v4-flash. The app, web client and V4 Pro are unchanged.
Assessment
Why it matters
A published model record with a documented capability or availability change.
Availability
Access notes
The API is in public testing; the app, web client and V4 Pro are unchanged.