Laguna S 2.1

Laguna S 2.1 is the first credible Western open-weight coding model in 11 months — a 118B MoE that activates only 8B parameters per token yet scores 70.2% on Terminal-Bench 2.1, beating models 10x its size. But it's not at the frontier — GPT-5.6 Sol and Kimi K3 sit far ahead — and known limitations include harness overfitting, JSON mangling in nested tool arguments, and no configurable thinking-effort control. Poolside's collapsed $14B Series C raises sustainability questions, making this best for self-hosted agentic coding where data sovereignty matters more than absolute benchmark leadership.