Yi 1.5 34B Chat
Yi 1.5 34B Chat is a 34B-parameter bilingual instruction-tuned model from 01.AI, the Beijing-based lab founded by Kai-Fu Lee, released in May 2024. It delivers competitive English and Chinese performance for its parameter class, with benchmark scores on MT-Bench and CMMLU that held up well at release. The significant drawback for most modern workloads is the 4K context ceiling — inadequate for document-length inputs and a hard disqualifier for RAG use cases that need more headroom. Apache 2.0 licensing means no commercial restrictions. By mid-2025, Qwen 2.5 and DeepSeek V2 models in the same size class offer longer context and generally stronger benchmark numbers; Yi 1.5 34B is worth considering mainly where bilingual Chinese support and Apache licensing are both required.
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