Opik

Opik by Comet is an open-source AI observability and evaluation platform for teams building LLM applications and agents. It helps developers trace agent steps, inspect prompts, monitor production behavior, run evals, track costs, and improve AI system reliability across development, testing, and production. The platform is useful for SaaS founders and engineering teams that need visibility into what their agents and AI workflows are actually doing. Instead of guessing why a response failed, teams can inspect traces, evaluate outputs, test prompts, monitor hallucinations, and track model spend across workflows. Opik is especially relevant for production AI teams because it combines observability, evaluations, prompt optimization, agent playgrounds, cost intelligence, and debugging tools in one system. The open-source core also makes it attractive for builders who want control before committing to enterprise infrastructure. For FutureStack, Opik belongs in Developer Tools because it solves a critical AI product problem: understanding, testing, and improving LLM behavior after a product moves beyond demos. It is best for developers and founders building agents, RAG systems, coding tools, support bots, internal copilots, and model-powered SaaS products.