Qwen Code

Alibaba released Qwen Code 1.0 Preview, merging the Harness capabilities refined in Qoder into a single open-source kernel that gives developers an embeddable Agent runtime. The architecture evolves from single-process multi-session to multi-node multi-session, using a unified event model to separate reasoning orchestration from tool execution while centralizing model access, sandbox resources and MCP configuration. The existing stable branch remains available as 1.0 opens on a separate branch.