Inference13 min
MoE: How the Mixture of Experts Routes a Token
The router in DeepSeek-V3 is a 7,168 × 256 matrix — 1.8M parameters picking 8 of 256 experts for every token, in a layer of 11.3B. This post covers what the MLP post's one MoE paragraph skipped: how the router works, what the sparsity buys, and the recipe the mid-2026 frontier — DeepSeek-V4, GLM-5.2, Kimi K2.6 — converged on.