DeepSeek V3.1 is an AI model released by DeepSeek on Aug 21 2025, 85 days after DeepSeek R1-0528. It is the 15th tracked release from DeepSeek out of 20 total. It is an open-source / open-weight model.
About DeepSeek: Chinese AI lab known for efficient, open-weight models. Gained attention for strong performance at lower cost.