Llama-4

• Jun 21, 2026 Mixture of Experts, Honestly: Why Every Frontier Model Went Sparse and What It Actually Costs

  The honest accounting on Mixture of Experts: why every frontier model in 2026 is sparse, what the "X total / Y active" parameter math actually buys you, the routing problems the marketing skips, and the all-to-all communication tax that decides whether a MoE model ships or stalls.