DeepSeek-V4 model family
Overview
DeepSeek's flagship open-weight models: V4-Pro (1.6T total / 49B active parameters) and V4-Flash (284B / 13B active), both MIT-licensed with 1M-token context and hybrid thinking/non-thinking modes - reportedly trained on Huawei Ascend chips without Nvidia GPUs.
Released in preview on April 24, 2026 with weights on Hugging Face. DeepSeek moved a retrained V4-Flash-0731 API into public beta on July 31, 2026, then shipped V4-Pro-0813 to full general availability across app, web and API on August 12, 2026. On September 10 it launched V4.1-Flash (API name deepseek-flash), a 552B MoE with 8B active input / 16B active output parameters and native vision, and retired V4-Flash and V4-Flash-Vision-Exp. From 04:00 UTC on September 14, deepseek-v4-pro requests route to V4.1-Flash at Flash rates until V4.1-Pro launches. New peak/off-peak pricing for V4.1-Flash took effect September 10. Legacy deepseek-chat and deepseek-reasoner endpoints retired July 24, 2026.