The Implosion of the Top Open Source Lab Qwen

Quick Overview

The implied implosion of the Qwen open-source LLM lab stems from Alibaba Cloud CTO Zhou Jingren splitting the vertically integrated Qwen team into horizontal divisions, a decision that directly conflicted with Qwen lead Junyang Lin's belief in close integration, leading to Lin's resignation on March 4, 2026, shortly after the successful Qwen 3.5 release, despite Alibaba publicly affirming its commitment to open-source AI research.

Key Points: Alibaba Cloud CTO Zhou Jingren initiated organizational changes to split the Qwen team from a vertical integration model into separate horizontal divisions (pre-training, post-training, text, multimodality), which narrowed Junyang Lin's management scope. The team's technical lead, Junyang Lin (Justin Lin), resigned on March 4, 2026, just 48 hours after the team shipped the Qwen 3.5 small model series, which received praise including from Elon Musk for its 'impressive intelligence density'. Lin's resignation was likely driven by disagreement with the organizational split, as he advocated for closer integration between pre-training, post-training, and infrastructure teams, contrasting with the CTO's move. Qwen 3.5 models, despite being nearly half the size (397B vs 744B) of top models like GLM-5, achieved a competitive score of 45 on the Artificial Analysis Intelligence Index, placing it among top open-source models. Following the departure, Alibaba Cloud CEO Wu Yongming confirmed Lin's resignation approval in an internal memo (March 5, 2026), stating Alibaba would double down on its open-source model strategy, establish a Foundation Model Support Group, and increase investment in AI R&D. Other Qwen leaders, including Kaixin Li and Binyuan Hui, also announced their departures, signaling a significant talent exodus from the project. A tweet suggested that external customers had smoother access to Alibaba's compute than the internal Qwen team building its most important model, indicating internal resource struggles.

Context: The video details the sudden departure of Junyang Lin, the technical lead of Alibaba's Qwen Large Language Model (LLM) project, on March 4, 2026. Lin was instrumental in developing Qwen, which rapidly rose in open-source rankings, even achieving high scores with smaller models like Qwen 3.5. The context for his departure involves an internal power struggle and organizational restructuring initiated by Alibaba Cloud CTO Zhou Jingren, who moved to dismantle the integrated structure Lin championed in favor of separate, horizontal teams, leading to Lin's resignation shortly after a major product release.