Dear DeepSeek API user,

DeepSeek has officially released the V4.1 Flash model on September 10, 2026 (Beijing Time). In the meanwhile, we plan to postpone the discontinuation of the V4 Pro service to 12:00 Beijing Time on September 14, 2026. At that time, all requests to the Pro model will be routed to V4.1 Flash and billed at Flash's price. After extensive internal and external testing, V4.1 Flash has comprehensively surpassed V4 Pro across all key metrics, including performance, cost, speed, and task completion time. If you encounter any issues during your comparative testing between V4 Pro and V4.1 Flash, please do not hesitate to reach out to us with your feedback.

The price of V4 Pro remains unchanged during the service period. The price of V4.1 Flash will take effect at 4:00 UTC, September 10, 2026.