Yi

A family of bilingual AI models from 01.AI, the company founded by AI pioneer Kai-Fu Lee. Yi models deliver strong performance in both English and Chinese, available in sizes from 6B to 34B parameters — making them a compelling choice for developers building multilingual applications.

• Bilingual capability — natively strong in both English and Chinese language tasks • Multiple sizes — models from 6B to 34B parameters for different deployment needs • Open weights — freely available for research and commercial use • Long context — supports up to 200K token context windows in extended versions • Vision models — multimodal variants that understand images alongside text • Competitive benchmarks — performs well against larger models on reasoning and coding

Free and open-source. Available on Hugging Face and through various API providers.