DeepSeek unveils V4.1 flash model today, v4 pro service delayed to september 14

DeepSeek has officially launched its V4.1 Flash model today, September 10, 2026, with new pricing for the Flash version. The company also announced that the V4 Pro service will be retired on September 14, 2026, at 12:00 UTC, redirecting users to the V4.1 Flash model and applying its pricing structure. According to internal and external testing, the V4.1 Flash model outperforms the V4 Pro in performance, cost, speed, and total time. The new pricing for V4.1 Flash took effect at 12:00 UTC on September 10, 2026, with idle input cache hit rate at 0.02 yuan, input cache miss at 1 yuan, and output at 4 yuan per unit. The transition marks a significant shift in DeepSeek's service offerings.