opik
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Comet
Comet is an AI developer platform that helps machine learning and AI teams track, evaluate, monitor, and manage models across their full lifecycle - from training experiments to production LLM and agentic applications. Founded in 2017 by Gideon Mendels and Nimrod Lahav, the New York-based company built its reputation on experiment tracking ('GitHub for machine learning') and now extends that into the generative-AI era with Opik, its open-source LLM observability and evaluation platform.
Gideon Mendels
Gideon Mendels is the co-founder and CEO of Comet, the New York machine-learning platform that tracks, compares, and explains the experiments behind AI models. A computer scientist and NLP researcher by training, he built hate-speech detection at Google and ran speech-recognition research at Columbia before turning the messy, undocumented reality of model-building into a company. In 2024 Comet shipped Opik, an open-source LLM evaluation tool, putting Mendels at the center of the scramble to make AI agents reliable in production.