Instructor
The leading library for getting structured, validated output from LLMs using Pydantic.
About Instructor
Instructor is the most popular Python library for extracting structured, validated data from LLMs, with 11k+ GitHub stars and 3 million+ monthly downloads. Built on Pydantic, it supports 15+ providers including OpenAI, Anthropic Claude, and Google Gemini, and is available in Python, TypeScript, Go, Ruby, Elixir, and Rust.
Key Features
💰 Pricing
Completely free and open source under MIT license.
MIT-licensed, free for all use cases
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📊 Comparison vs Alternatives
| Feature | ||||
|---|---|---|---|---|
| Pricing | Free | Freemium | Freemium | Freemium |
| Rating | ⭐ 4.7 | ⭐ 4.8 | ⭐ 4.8 | ⭐ 4.6 |
| Free Tier | ✅ | ✅ | ✅ | ✅ |
| Popularity | 55% | 100% | 94% | 92% |
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