Laguna S 2.1

Laguna S 2.1 is poolside's first major public model release, shipped July 21, 2026 with open weights on Hugging Face the same day under the OpenMDW-1.1 license. It is a 118 billion parameter mixture-of-experts with roughly 8 billion active per token, a 1,048,576 token context window, and up to 131,072 output tokens. Hosted pricing on OpenRouter is $0.10 per million input tokens and $0.20 per million output, with cache reads at $0.01, which puts it among the cheapest frontier-adjacent coding options available. poolside reports 70.2 percent on Terminal-Bench 2.1 in thinking mode, 78.5 percent on SWE-Bench Multilingual, and 40.4 percent on DeepSWE, claiming it leads open models of disclosed size and outranks systems roughly ten times larger. The part worth noting is the eval hygiene: poolside disclosed that Terminal-Bench results come from its own harness and published the full unedited trajectory of every benchmark trial, which is a materially higher standard than the vendor-claimed tables that shipped with most of the same week's launches. At 8 billion active parameters the model is genuinely runnable on modest hardware, which separates it from the 1T-plus open-weight releases where downloadable does not mean deployable.