Arcee releases Trinity-Large-Thinking, a 399-billion parameter open-source AI model under Apache 2.0 license, positioning U.S. companies to compete as Chinese firms shift toward proprietary models.

Arcee, a San Francisco-based AI lab, released Trinity-Large-Thinking this week as a text-only reasoning model with 399 billion parameters under the open Apache 2.0 license

The model allows full customizability and commercial usage by anyone from indie developers to large enterprises, contrasting with Chinese companies' recent pivot toward proprietary models

The release represents a strategic U.S. push for 'American Open Weights' as a sovereign alternative to increasingly closed AI development, following Meta's Llama and Chinese labs' dominance in open-source AI