TensorZero is an open-source stack designed for industrial-grade LLM applications. It integrates an LLM gateway with tools for observability, optimization, evaluations, and experimentation, with the overarching aim of enabling LLM applications to learn from real-world experiences. TensorZero facilitates a feedback loop for optimizing LLM applications, transforming production data into smarter, more efficient models. Engineers in various industries, including healthcare, finance, and developer tools, utilize TensorZero to enhance their capabilities. The company is backed by prominent investors and boasts a team of experts, including former maintainers of the Rust compiler and machine learning researchers from leading universities.