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Poolside released Laguna S 2.1, a 118B-parameter open-weight Mixture-of-Experts coding model with 8B active parameters per token and a 1M-token context window. It scores 70.2% on Terminal-Bench 2.1 and 78.5% on SWE-Bench Multilingual, leading open disclosed-size models. At 4-bit it runs on a single NVIDIA DGX Spark. Training took under nine weeks on 4,096 H200 GPUs.
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