DeepSeek said on its website it plans to release the V4.1 Flash model around
Sept. 10, 2026 (Beijing time). Internal and external testing shows V4.1 Flash
outperforms V4 Pro on performance, cost, speed and total runtime. After V4.1
Flash goes live and until V4.1 Pro launches, DeepSeek will route all V4 Pro
requests to V4.1 Flash and apply V4.1 Flash pricing.