Naive AI Raises $400 Million at $1.42 Billion Valuation, Skips Pretraining to Improve Existing Models

Chinese startup Naive AI has secured $400 million in funding at a $1.42 billion valuation, with a distinctly capital-efficient strategy: rather than training a large language model from scratch, the company will build improvements on top of an existing open-weight model. Founded in February 2026 by Tsinghua University professor Dai Jifeng, Naive AI achieved the valuation after attracting Tencent, IDG Capital, and HSG—formerly Sequoia Capital China—across three funding rounds ($100 million, $180 million, and $120 million respectively). The Beijing-based startup, operating with fewer than 100 employees, plans to release its first large language model as early as September 2026 as a free, open-weight model that users can download and customize.