Yi (01.AI)

01.AI's open Yi model family — the lab founded by Kai-Fu Lee

Open Source Coding & Development

What is Yi (01.AI)?

Yi is the open model family from 01.AI, the Beijing lab founded by Kai-Fu Lee in 2023. Yi models (from small edge sizes to large Yi-Large) were released with open weights and bilingual Chinese-English strength, and remain popular for self-hosting and research. 01.AI has since shifted its focus toward enterprise AI solutions built on leading open models.

Key features

  • Open-weight Yi model family
  • Bilingual Chinese-English training
  • Multiple sizes for edge to server
  • Enterprise solutions from the same lab

Pros

  • Genuinely open releases
  • Strong bilingual performance
  • Respected research team

Cons

  • Consumer chat product was wound down
  • Development pace has slowed
  • Mostly a developer/research asset now

Yi (01.AI) at a glance

PricingOpen Source
CategoryCoding & Development
Platformsweb
Company01.AI
Best forDevelopers self-hosting bilingual open models
Official websitewww.01.ai
llmopen weightsopen source models

How to choose the right Coding & Development tool

The right coding tool depends on where you write code and how much of your codebase it can understand. IDE integration is the first filter — a tool that lives in your editor, sees your project files and respects your stack will help far more than a general chatbot you paste snippets into. Look for accurate completions, clear explanations of suggested changes, and strong refactoring and debugging support for your main languages. Privacy deserves real attention: check whether your code is used for training, and whether a self-hosted or enterprise option exists for sensitive projects. Price against the hours it actually saves — most developers feel the difference within the first week of real use.

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Yi (01.AI) FAQs

What is Yi (01.AI)?

Yi is the open model family from 01.AI, the Beijing lab founded by Kai-Fu Lee in 2023. Yi models (from small edge sizes to large Yi-Large) were released with open weights and bilingual Chinese-English strength, and remain popular for self-hosting and research. 01.AI has since shifted its focus toward enterprise AI solutions built on leading open models.

What are the main features of Yi (01.AI)?

Yi (01.AI) offers Open-weight Yi model family, Bilingual Chinese-English training, Multiple sizes for edge to server and Enterprise solutions from the same lab.

How much does Yi (01.AI) cost?

Yi (01.AI) is open source, so the software itself is free to download, use and self-host. Your only costs are the infrastructure you run it on and any paid services you connect to it.

What are the pros and cons of Yi (01.AI)?

Strengths of Yi (01.AI) include Genuinely open releases; Strong bilingual performance; Respected research team. On the downside, Consumer chat product was wound down; Development pace has slowed; Mostly a developer/research asset now.