Alibaba released Qwen Code 1.0 and open-sourced the merged codebase of Qoder and Qwen Code, providing developers with an embeddable Agent runtime foundation. The release integrates Harness capabilities refined in Qoder into Qwen Code, connecting models, tools, and execution processes within a single open-source kernel. Qwen Code 1.0 features an architecture that starts from an in-process in-memory event bus and evolves toward distributed design, expanding access, scheduling, and execution in layers. The system employs a "separation of hand and brain" approach, independently managing inference orchestration and tool execution. The Qwen Code 1.0 Preview is released as a separate branch while the existing stable branch remains available. Developers can use the Harness to build Agent systems tailored to their specific scenarios.