Prompt Fu

An open-source unit testing framework for AI prompts, recently acquired by OpenAI. Tests different prompts against different models to optimize application behavior. Also includes automated red team attacks for prompt injection vulnerability testing.

What It Does

• Prompt testing: Run the same prompt against multiple models; compare outputs; find the best model × prompt combination for your use case
• Red team attacks: Automated adversarial testing to determine if your chatbot can be tricked into revealing API keys, system prompts, or other sensitive information via prompt injection

Why It Matters

If you’re building an app that lets end users interact with AI, half the battle is figuring out if you’re using the best model with the best prompt. Prompt Fu automates that comparison. The red team capability addresses a real security concern — prompt injection is an OWASP-level vulnerability.

See Also

• AutoResearch and Evals — related approach to measuring and improving AI outputs
• Fireship — source
• Source: 7 Open-Source AI Tools