Yi-1.5-6B

Yi-1.5-6B is the 6-billion-parameter base model of 01.AI's Yi-1.5 series, open-sourced on May 13, 2024. It continues pretraining on the Yi base with 500 billion additional high-quality tokens and fine-tuning on 3 million diverse samples, delivering stronger coding, math, reasoning, and instruction-following than the original Yi-6B while keeping strong language understanding and commonsense performance.

Released under the Apache 2.0 license with 4K context (16K/32K variants available), it runs comfortably on consumer GPUs and is widely used as a compact bilingual English/Chinese foundation for chatbots, RAG pipelines, and fine-tuning experiments.