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Yi (01.AI)

01.AI's Yi Lightning series with frontier-class reasoning, long-context support, and highly competitive API pricing from Kai-Fu Lee's AI lab.

Last updated: Apr 29, 2026

Performance Metrics

Hover over scores for detailed breakdown and explanations

Performance
87
Very Good
Privacy
48
Fair
Ease of Use
78
Very Good

Supported Models & Capabilities

AI models and features available in this solution

Yi Lightning

huge

Fast frontier model with strong reasoning and competitive pricing

Technical Specifications

Hardware and system requirements

Context Window
128K tokens
API Pricing
$0.50/$1.50 per 1M tokens
Free Tier
Free chat with rate limits

Why Choose Yi (01.AI)?

Key advantages and use cases

Latest Models

Access to cutting-edge AI models as soon as they're released.

Multi-Device Access

Use from any device with a web browser. No hardware requirements.

Automatic Updates

Always running the latest version with new features and improvements.

Free to Use

No subscription or usage fees. Perfect for experimentation and personal use.

Ready to Get Started?

Sign up and start using immediately. No setup required, access from anywhere.