Signal Shanghai AI Lab quietly ships 744B-parameter agentic model Atria Dawn Preview

Summary

Shanghai Artificial Intelligence Laboratory quietly released 'Atria Dawn Preview,' a 744-billion-parameter agentic Mixture-of-Experts model, without any accompanying blog post, paper, pricing, or API announcement. A GitHub repository for the model appeared on September 11, 2026, with an FP8 checkpoint following on September 12. The model is built through post-training on top of Z.ai's 744B-parameter GLM-5.2 base model, with roughly 40 billion of its 744 billion parameters active per token. Across 16 benchmarks spanning real-world research, engineering, and digital-work tasks, the model is competitive with frontier agentic models and achieves the highest reported score on five of them. It is released under an MIT license, free to use.