AI RESEARCH
The ATOM Report: Measuring the Open Language Model Ecosystem
arXiv CS.LG
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ArXi:2604.07190v1 Announce Type: cross We present a comprehensive adoption snapshot of the leading open language models and who is building them, focusing on the ~1.5K mainline open models from the likes of Alibaba's Qwen, DeepSeek, Meta's Llama, that are the foundation of an ecosystem crucial to researchers, entrepreneurs, and policy advisors. We document a clear trend where Chinese models overtook their counterparts built in the U. S. in the summer of 2025 and subsequently widened the gap over their western counterparts.