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What's new in Instructor v2?

Instructor v2 is a large internal rewrite with a deliberately conservative public goal: the library should feel familiar to existing users, while becoming much easier to extend, reason about, and type-check.

The previous architecture accumulated a lot of provider-specific behavior in shared modules. That worked, but it made the codebase harder to grow. Adding a provider could mean touching response parsing, retry logic, multimodal handling, mode normalization, and client setup in several unrelated places.

V2 moves that logic into a provider-owned architecture. The external API stays recognizable. The internals become more explicit.

London Stock Exchange Group Powers Market Surveillance with Instructor

London Stock Exchange Group (LSEG) has deployed Instructor in production to power their AI-driven market surveillance system, demonstrating the library's capability in mission-critical financial applications.

Instructor Now Supports llms.txt

We've added automatic llms.txt generation to Instructor's documentation using the mkdocs-llmstxt plugin.

Automating llms.txt Generation with mkdocs-llmstxt Plugin

Today we integrated the mkdocs-llmstxt plugin into Instructor's documentation pipeline. This powerful plugin automatically generates llms.txt files from our MkDocs documentation, making our comprehensive guides instantly accessible to AI language models.

Understanding Semantic Validation with Structured Outputs

Semantic validation uses LLMs to evaluate content against complex, subjective, and contextual criteria that would be difficult to implement with traditional rule-based validation approaches.

As LLMs become increasingly integrated into production systems, ensuring the quality and safety of their outputs is paramount. Traditional validation methods relying on explicit rules can't keep up with the complexity and nuance of natural language. With the release of Instructor's semantic validation capabilities, we now have a powerful way to validate structured outputs against sophisticated criteria.

Announcing Responses API support

We're excited to announce Instructor's integration with OpenAI's new Responses API. This integration brings a more streamlined approach to working with structured outputs from OpenAI models. Let's see what makes this integration special and how it can improve your LLM applications.

Announcing unified provider interface

We are pleased to introduce a significant enhancement to Instructor: the from_provider() function. While Instructor has always focused on providing robust structured outputs, we've observed that many users work with multiple LLM providers. This often involves repetitive setup for each client.

The from_provider() function aims to simplify this process, making it easier to initialize clients and experiment across different models.

This new feature offers a streamlined, string-based method to initialize an Instructor-enhanced client for a variety of popular LLM providers.

Using Anthropic's Web Search with Instructor for Real-Time Data

Anthropic's new web search tool, when combined with Instructor, provides a powerful way to get real-time, structured data from the web. This allows you to build applications that can answer questions and provide information that is up-to-date, going beyond the knowledge cut-off of large language models.

In this post, we'll explore how to use the web_search tool with Instructor to fetch the latest information and structure it into a Pydantic model. Even a simple structure can be very effective for clarity and further processing.

What is MCP

With OpenAI joining Anthropic in supporting the Model Context Protocol (MCP), we're witnessing a unified standard for language models to interact with external systems. This creates exciting opportunities for multi-LLM architectures where specialized AI applications work in parallel-discovering tools, handing off tasks, and accessing powerful capabilities through standardized interfaces.

Instructor Adopts llms.txt: Making Documentation AI-Friendly

We're excited to announce that Instructor now implements the llms.txt specification! You can now find our llms.txt file at python.useinstructor.com/llms.txt. This adoption marks an important step in making our documentation more accessible to AI language models.