Model Card: Microsoft Mage-VL-Cowork
Microsoft Mage-VL-Cowork (HF ID `microsoft/Mage-VL-Cowork`): published to HuggingFace 2026-10-30, 4B parameters, 32,768-token active context (architecture supports up to 262,144), Apache-2.0, no official paid API. OSWorld-Verified: 66.0%, the best score at the 4B scale, ahead of the 27B Qwen3.6-27B (63.9%), the 72B OpenCUA-72B (44.9%), and Claude Sonnet 4.5 (62.9%) even though Sonnet got double the step budget. A single policy routes between screenshot-based GUI actions (`computer_use`) and `bash` terminal execution on its own, with no external router. Online Hybrid RL (GRPO) adds roughly 10pp over plain Hybrid SFT while cutting model calls by 13% and output tokens by 25.4%. Microsoft's own card says it should only run inside an isolated sandbox or VM, never with real credentials or local filesystem access.