Yi
Featured
Chat & Assistants
01.AI
FreeOpen SourceAPI
About
Open-source LLM series by 01.AI (founded by Kai-Fu Lee), Yi-Lightning offers fast inference and excellent multilingual capabilities
Key Features
Yi-Lightning series with fast inference
Open-source LLM weights
Multilingual support (Chinese, English, more)
Strong reasoning capabilities
Cost-effective API pricing
Active community development
Pricing
free
Open-source, free to self-host
api
Competitive API pricing (~¥0.5/1K tokens)
Use Cases
Custom LLM application development
Local deployment for privacy
Research and fine-tuning
Multilingual chat applications
Cost-efficient API integration
Pros
Open-source and commercially usable
Fast inference speed
Strong English performance
Cost-effective pricing
Cons
Smaller community vs major open models
Less multimodal capability
Documentation could be improved
Latest Update
2026: Yi-Lightning series continues to improve with faster inference and stronger reasoning capabilities
Related Chat & Assistants Tools
ChatGPT
OpenAI
AI assistant by OpenAI for text generation, coding, data analysis and more
Claude
Anthropic
AI assistant by Anthropic, excels at long-context understanding and safe conversation
Gemini
Google
Google's multimodal AI model for text, image, and code understanding
Grok
xAI
AI assistant by xAI with real-time X integration, strong reasoning and live search