TMTPOST — Beijing-based Moonshot AI released Kimi K3 on Thursday, an open-source large language model with 28 trillion parameters, the largest of its kind globally. The new model natively supports vision understanding and features a one-million-token context window. Optimized for complex tasks including software engineering, knowledge work, deep research, and multimodal understanding, Kimi K3 significantly strengthens performance on demanding workloads. In independent evaluations, its overall capabilities approach those of leading closed-source frontier models. In the Chinese mainland, the race to develop ever-larger open models has intensified as domestic labs seek to close the gap with proprietary systems while building accessible foundations for the broader developer ecosystem. Moonshot AI’s release underscores a growing emphasis on full-stack architectural innovation and rigorous training methodologies, allowing local players to reduce reliance on foreign closed models and accelerate progress in high-complexity applications.