DeepSeek: DeepSeek v4.1 Flash 1017
DeepSeek V4.1 Flash 1017 is a snapshot of DeepSeek V4.1 Flash released on October 17, 2026, according to DeepSeek's API model. V4.1 Flash is a sparse mixture-of-experts model built on DeepSeek's Causal Encoder-Decoder (CED) architecture. It has an input of 8B parameters and an output of 16B parameters from a 552B-parameter backbone, an asymmetric split that keeps per-token compute low.
Visual understanding is inherent to the architecture, with visual and text embeddings trained together during pre-training, unlike the earlier V4 Flash Vision which added vision later. It is designed for coding, terminal, and computer-use agents, as well as long-horizon tasks requiring many steps and long-context analysis. Compressed KV caching reduces cache memory to about a quarter of the previous Flash version, cutting costs for agentic workloads.
DeepSeek positions it as the cost-efficient tier in the V4.1 family, claiming it outperforms V4 Pro in performance, speed, and task completion time. The model always redirects to the latest model in the DeepSeek Pro and Flash families.
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