DeepSeek Ships V4-Flash-0731 With Native Responses API Support and Codex Adaptation, Says V4-Pro 'Will Follow Soon'
DeepSeek API Docs (surfaced via r/LocalLLaMA, 752 upvotes / 283 comments; 445 points / 227 comments on Hacker News)·high signal
DeepSeek updated its Flash-tier API on July 31 with substantially rebuilt agent capabilities: Terminal Bench 2.1 82.7, NL2Repo 54.2, Cybergym 76.7, DeepSWE 54.4, Toolathlon verified 70.3, DSBench-FullStack 68.7 and DSBench-Hard 59.6 — figures the changelog says now far exceed the V4-Pro-Preview. The model natively supports the Responses API format and is specifically adapted for Codex, and the changelog notes only the Flash API changed; the V4-Pro API and the APP/WEB models are unchanged, with the official V4-Pro release to follow. For builders, a Flash-tier model that speaks Responses natively is a near drop-in swap inside existing OpenAI-shaped agent harnesses.