poolside/laguna-s-2.1:free is Poolside's latest open-weight coding and reasoning model, built specifically for agentic software engineering and long-horizon development tasks. Featuring a 118B-parameter Mixture-of-Experts (MoE) architecture with 8B active parameters per token and a massive 1 million-token context window, Laguna S 2.1 delivers frontier-level coding performance while remaining efficient to serve. It is designed to power AI coding assistants, developer agents, repository understanding, and complex programming workflows. Released under the OpenMDW-1.1 license, Laguna S 2.1 supports advanced reasoning, tool calling, and long-context code understanding, making it suitable for developers, enterprises, and AI applications that require reliable software engineering capabilities.