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Instructor

Open-source library that gets typed, validated structured data from LLMs, with automatic retries, for 15+ providers.

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Is Instructor free?

Yes, Instructor has a free plan. What you get: Open source (MIT): free library; you bring your own LLM provider or local model. To get it: pip install instructor; then set your provider's API key or run a local model; then call client.create with a Pydantic response_model. Verified on python.useinstructor.com.

Free plan at a glance

Includes
  • Open source (MIT): free library; you bring your own LLM provider or local model

MIT licensed and free; the LLM provider you call sets any cost or rate limit.

Duration
Free forever
Commercial use
Allowed on the free plan

How to get it free

Self-host
  1. pip install instructor
  2. Set your provider's API key or run a local model
  3. Call client.create with a Pydantic response_model

Good to know

  • You supply the LLM: a provider API key or a local model
Get the free plan

python.useinstructor.com, Checked Source

Overview

Instructor turns LLM responses into validated Pydantic objects: you define a model, and it builds the schema, checks the reply and retries when validation fails. It is MIT licensed, available for Python, TypeScript, Go, Ruby, Elixir and Rust, and works with hosted or local models.

Key features

  • Define the output you want as a Pydantic model and get a typed object back
  • Automatic retries when the response fails validation
  • Streaming of partial responses and lists
  • One from_provider interface for OpenAI, Anthropic, Google, Mistral, Cohere, Ollama, DeepSeek and more
  • Runs open-source models locally through Ollama, llama-cpp-python or vLLM
  • Hooks for logging, monitoring and custom error handling

Best for

Tasks
Use LLM & AI model APIs
People
Python developers extracting structured data from text with LLMs, Teams that switch between LLM providers, Developers running local models who need validated JSON output

Limitations

  • You need an LLM provider key or a local model; provider usage is billed by that provider
  • A code library: it needs programming, with basic Pydantic knowledge helping

FAQ

Is Instructor free?
Yes. Instructor has a free plan: Open source (MIT): free library; you bring your own LLM provider or local model. We last checked python.useinstructor.com's pricing page on 2026-10-24.
What does the Instructor free plan include?
Open source (MIT): free library; you bring your own LLM provider or local model. Source: https://python.useinstructor.com/ (checked 2026-10-24).
How do I get Instructor for free?
Steps: pip install instructor; Set your provider's API key or run a local model; Call client.create with a Pydantic response_model. Start at https://python.useinstructor.com/ (checked 2026-10-24).
Do I need an account to use Instructor for free?
Not for the free option: the free route is to self-host Instructor (pip install instructor). Checked 2026-10-24.
What's the catch with Instructor's free plan?
You supply the LLM: a provider API key or a local model. Checked 2026-10-24.
What are free alternatives to Instructor?
Tavily (free plan), Exa (free credits) and Requesty (free plan) are free alternatives. We checked their free offers on 2026-10-25.
Is Instructor free and open source?
Yes. Instructor is licensed under the MIT License and installs with pip.Source: python.useinstructor.com
Which LLM providers does Instructor support?
15+ providers, including OpenAI, Anthropic, Google Gemini, Mistral, Cohere, Ollama and DeepSeek.Source: python.useinstructor.com
Can I use Instructor with open source models?
Yes. It works with Ollama, llama-cpp-python and other local models.Source: python.useinstructor.com
Do I need to know Pydantic to use Instructor?
Basic Pydantic knowledge helps, but you can start with simple models and learn advanced features as you need them.Source: python.useinstructor.com

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Free offer
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