Libretto

Libretto is a specialized platform designed specifically for developers working with large language models. It automatically monitors your LLM traffic in real-time, flagging problematic calls that are toxic, unhelpful, or poor quality. Instead of manually sifting through countless API responses, Libretto does the heavy lifting by identifying weaknesses in your AI implementation and bringing them to your attention immediately.

The platform stands out by automating the most tedious aspects of LLM development. It generates comprehensive test sets sampled from your actual production traffic and creates evaluation criteria to judge model performance. You can experiment with different prompts, models, and strategies, getting actionable results within seconds rather than days. The drift detection feature is particularly valuable—it tests your prompts daily to alert you if the model's behavior changes unexpectedly, ensuring consistency in your AI product.

Software developers and AI product teams benefit most from Libretto, especially those building customer-facing applications powered by LLMs. It's perfect for identifying subtle failures that might otherwise go unnoticed, testing prompt variations before deployment, and maintaining consistent model performance over time. The platform essentially acts as a quality assurance engineer dedicated to your AI infrastructure, helping you build more reliable and effective AI-powered products.