DeepSeek V4.1 Flash hits 74.2 on DeepSWE, beating Opus 5 and Gemini 3.8 Flash; asymmetric MoE revealed
nrehiew_ · x · 2026-09-10
nrehiew surfaced two striking details about DeepSeek V4.1 Flash:
- Architecture returns to encoder-decoder: 552B total parameters with asymmetric activation—8B active on decode, 16B on prefill. Different activation counts per phase within one model is a first.
- It tops the DeepSWE benchmark at 74.2, edging out Astra, Opus 5, and Gemini 3.8 Flash (all at 74).
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