Gymnasium

Gymnasium is an open-source Python toolkit and API standard for reinforcement learning, designed as a maintained fork of OpenAI’s Gym. It provides a standardized, extensible interface for interacting with a wide range of reference environments, making it easy for researchers, students, and practitioners to develop, train, and evaluate reinforcement learning agents. Gymnasium emphasizes simplicity, compatibility, and migration support for legacy environments, and is maintained by the Farama Foundation.