DeepSeek Details V4.1-Flash: 552B MoE with Asymmetric 8B/16B Active Params, Beats Its Flagship
deepseek_ai · x · 2026-09-10
DeepSeek shared the architecture behind V4.1-Flash, key to its claimed flagship-beating results:
- 552B-parameter MoE with a novel Causal Encoder–Decoder architecture, highly asymmetric activation: only 8B active parameters for input, 16B for output
- Combined with new pre-training methods and larger-scale RL post-training, benchmark results surpass flagship models including DeepSeek-V4-Pro
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