DeepSeek-V4.1-Flash is a native multimodal MoE model released by DeepSeek on Sep 10, 2026. It has 552B total parameters with asymmetric CED architecture: 8B active for prefill, 16B for decode, supporting 1M context length. Optimized with extreme KV cache compression to cut memory cost. It delivers fast inference, strong agentic & coding reasoning, outperforming DeepSeek-V4 Pro.