Poolside has released Laguna S 2.1, its third coding model in three months. Rather than rely on raw scale, the company trained it to keep checking its work, revise failed approaches, and avoid giving up too soon during long agentic sessions. The compact model beats several much larger rivals in benchmarks. Poolside says it also solved a math problem that had been open since 1975 for under 10 cents.

Poolside's 118B-parameter Laguna S 2.1 matches larger models on coding benchmarks, runs on a single desktop, and targets enterprises wanting to self-host.

Poolside’s Laguna S 2.1 is a new Western open-weight coding AI model that rivals larger systems on benchmarks with transparent evaluation and low-cost deployment.