Baichuan 3
Baichuan's proprietary flagship model succeeding the open-weight Baichuan 2
Baichuan 3 is a closed, API-only foundation model that Baichuan Intelligent Technology launched in January 2024, marking the point where the company stopped open-sourcing its flagship models and moved to a proprietary hosted service instead. Baichuan hasn’t disclosed the parameter count, though the company has said it improved on tasks like Chinese-language reasoning, code generation, and math over Baichuan 2, and claimed wins over GPT-4 on some Chinese benchmarks such as CMMLU and GAOKAO-style evaluations. It supports a 128K token context window and is accessed only through Baichuan’s API and chat product rather than downloadable weights. It sits between the open Baichuan 2 line and the more capable Baichuan 4 that followed later in 2024, and it was aimed mainly at enterprise customers inside China rather than at competing head-to-head with Western frontier models internationally.