Yi
by 01.AI · www.01.ai ↗
Open-weight bilingual (English and Chinese) large language model family from 01.AI.
open-weights llm bilingual
- Category
- Open Models
- Business model
- Open (open weights/source)
- Availability
- Global
- Launched
- 2023-11
- Record updated
- 2026-07-30
- Model family
- Yi
- License
- Apache-2.0
- Founded
- 2023
- Headquarters
- CN
- Canonical URL
- https://globalaiproductindex.com/products/yi/
Overview
Yi is a family of open-weight large language models from 01.AI, trained for strong bilingual performance in English and Chinese. The series spans multiple sizes, including base and chat-tuned variants, with weights released under the Apache-2.0 license. Yi models can be downloaded and self-hosted for free, making them a common choice for bilingual applications.
Key features
- Open-weight LLMs in multiple parameter sizes
- Strong bilingual English and Chinese performance
- Base and chat-tuned variants for different uses
- Apache-2.0 license permitting commercial use
Use cases
- Self-hosting a bilingual chat or writing assistant
- Fine-tuning on domain data for Chinese-English products
- Research on open large language models
Pricing
Yi model weights are free to download and use under Apache-2.0; costs come only from the compute used to run or fine-tune them.
Frequently asked questions
Is Yi free to use?
Yes. Yi weights are released under Apache-2.0, which permits free commercial use and modification.
What languages does Yi target?
Yi is trained for bilingual performance, with a focus on English and Chinese.
Who develops Yi?
Yi is developed by 01.AI, the Chinese AI company founded by Kai-Fu Lee in 2023.
Similar products
- Baichuan — Open-weight bilingual LLM family from Beijing-based Baichuan Intelligence, now focused on medical AI with its Baichuan-M reasoning models.
- Command R — Cohere's open-weight LLM family optimized for retrieval-augmented generation and tool use; succeeded by Command A as Cohere's flagship.
- DBRX — Open-weight mixture-of-experts LLM released by Databricks in 2024; retired from Databricks serving in 2025, though the weights remain available.
- DeepSeek — Open-weight LLM family and chat assistant from Hangzhou-based DeepSeek, known for strong reasoning models. The official DeepSeek-V4-Flash-0731 API brings a major agent-capability upgrade via post-training, with native Responses API support and Codex adaptation.
- Falcon — Family of open-weight large language models developed by the Technology Innovation Institute (TII).
- Gemma — Google's family of lightweight open-weight models derived from the same research as Gemini.
Sources
This record was last reviewed on 2026-07-30.
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