Arcee Releases Powerful Open-Source U.S. AI Model

San Francisco-based Arcee has launched Trinity-Large-Thinking, a 399-billion parameter reasoning model released under the Apache 2.0 license, enabling full customization and commercial use by developers and enterprises alike. The release comes as Chinese AI labs shift toward proprietary models, creating uncertainty around open-source AI leadership. Arcee's move positions American-made open-weight models as a sovereign alternative in the evolving global AI landscape.