Tool overview
Instructor is listed under Programming AI tools.
What is Instructor?
Instructor is an open-source family of libraries for extracting typed, validated data from language models. It adds schema-driven responses, automatic validation retries, streaming, nested objects, and consistent provider integrations across Python, TypeScript, Go, Ruby, Elixir, and Rust.
Best for
Developers who need dependable typed outputs from LLMs
Who is it for?
Decision note
Rebuilt from the original export under the complete V412/V411 factual-source-verification workflow. Preview only. Apply remains blocked until Failures = 0, Warnings = 0, Unmapped = 0, Missing = 0; explicit clears are reviewed; image import is disabled or V380 accepts the asset; a representative WordPress edit screen is compared with the export and proposed row; and a post-Apply zero-change Preview succeeds.
Key features
Typed schema extraction and validation
Automatic retries with validation errors
Streaming and nested structured objects
Integrations with more than 15 model providers
Use cases
Extract structured data from text
Validate model-generated JSON
Build classification and extraction pipelines
Use the same pattern across multiple model providers
Pros
- Free under the MIT license
- Lightweight focus on structured outputs
- Implementations in six programming languages
Cons
- Users pay their selected model provider
- Validation depends on schema quality
- Provider-specific behavior still requires testing
Limitations
Instructor does not host models or include inference costs.
Schemas and retries reduce malformed output but do not guarantee factual correctness.
Pricing details
Billing options
Pricing note
Instructor is free open-source software. Users pay any inference charges directly to the model providers they connect.
Supported programming languages
- English
Integrations
OpenAI
Anthropic
Google Gemini
Azure OpenAI
AWS Bedrock
Mistral
Cohere
Groq
DeepSeek
Ollama
OpenRouter
LiteLLM
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