PromptPex

microsoft.github.io · checked 8 Oct 2026

#23 · AI Prompt Generators

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How it plugs in

NoPublic API

NoOpen source

NoFree tier

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PromptPex is a tool for developers to explore and test AI model prompts by treating prompts as functions and generating test inputs.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: microsoft.github.io
Price: Not published
Free trial: Not stated
Automatic rule extraction: PromptPex extracts output rules written in natural language in a prompt, such as a requirement to format output as JSON.
CLI and Docker: PromptPex is packaged as an npm command-line tool and can also be run in Docker.
Configurable generation: Test generation can be configured with scenarios, test expansions, and custom instructions.
Deployment: The project README gives a Docker command for running PromptPex, and the setup guide describes a local web interface.
Feedback: The transparency note invites feedback and collaboration by email and says the team will update the repository with mitigations for reported or identified issues.
Integrations: PromptPex documents exports and integrations for OpenAI Evals, Azure OpenAI Stored Completions, GitHub Models Evals, and GitHub Actions.
Intended audience: The project describes its intended users as developers who keep prompts in their codebase.
Intended use: The released open-source library is intended for research, and the maker says it should not be used in downstream applications without additional evaluation of robustness, safety, harm, and bias.
Limitations: The maker says vague prompts can produce suboptimal results and rule extraction can vary in accuracy, especially with complex or idiomatic language.
Maker: The documentation footer identifies Microsoft as the maker of PromptPex.
Model evaluation: PromptPex can evaluate prompt performance across models, and uses an LLM to assess whether model outputs meet specified requirements.
Model providers: The setup guide says users can configure OpenAI, Azure OpenAI, or Ollama credentials.

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