DeepSeek V4.1 Flash: Stronger, Faster, More Accessible

DeepSeek V4.1 Flash is announced as a stronger, faster, and more accessible model, outperforming V4 Pro in performance, cost, speed, and total time-to-completion. DeepSeek plans to phase out V4 Pro, with all requests to deepseek-v4-pro being routed to V4.1 Flash and billed at its unit price after 12:00 Beijing time on September 14, 2026, until V4.1 Pro launches. A technical report for DeepSeek-V4.1-Flash is available.

Unlike typical model updates, DeepSeek V4.1 Flash will replace V4 Pro entirely, with all requests to the older model automatically rerouted to the new one after September 14, 2026.