Test and enhance AI models by using various simulated environments for training and evaluation.
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Gym has 1.1k stars on GitHub. It has been forked 252 times. Gym is written mainly in Python. It has been in active development since 2025. Gym is available under the Apache-2.0 license. Its main topics are agents, benchmarks, environments, evaluation.
What is Gym?
Evaluate and improve models and agents using environments
Is Gym open source?
Gym is an open-source project. It is released under the Apache-2.0 license.
Is Gym free?
Yes. Gym is free and open source — you can use, modify and self-host it.
What license does Gym use?
Gym is available under the Apache-2.0 license.
What language is Gym written in?
Gym is written mainly in Python.
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