Laguna XS 2.1

Laguna XS 2.1 stands out for keeping the line’s long-context design with a small active workload. Its 33 billion total parameters yield 3 billion active per token, while 10 global and 30 sliding-window layers process a 262,144-token context with a 512-token local window. The larger family variant is Laguna S 2.1.

Poolside describes XS 2.1 as an upgraded version of Laguna XS.2 and says the XS.2 API is being sunset. Poolside describes the reasoning as interleaved thinking between tool calls and lets you enable or disable it per request. The OpenMDW-1.1 license permits commercial use.