InternScience (Shanghai AI Lab) · Open-Weight Agent Model

Sage-A1.5

A 35B mixture-of-experts agentic model from Shanghai AI Laboratory, built on Qwen3.6-35B-A3B and Agents-A1, with a 256K served context. It adds agentic orchestration (parallel subagents with separate contexts) and an opt-in verification mode where the model reviews its own progress mid-run. Weights are on Hugging Face under Apache 2.0 (uploaded 15 October), with FP8 and GGUF versions, and it serves through SGLang or vLLM. The team reports 81.7 on BrowseComp, 61.2 on SWE-bench Pro, 81.6 on IFBench and 92.0 on XBench-DS-2510, and a 17.6-point SWE-bench Pro gain over A1 (self-reported). Follows Agents-A1 covered in week 27.