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Gymnasium
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Gymnasium

A standard API for single-agent reinforcement learning environments, with popular reference environments and related utilities (formerly Gym)

by Farama-Foundation · GitHub
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apigymreinforcement-learningMITPython
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In plain words

Gymnasium is the maintained successor to OpenAI Gym: one API that every RL algorithm and environment speaks.

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Excerpts from the project README on GitHub. Copyright and licensing remain with the respective authors.

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12.4k12.2k
2026-07-122026-08-31
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📄 About

A standard API for single-agent reinforcement learning environments, with popular reference environments and related utilities (formerly Gym)

Gymnasium has 12.4k stars on GitHub. It has been forked 1.4k times. Gymnasium is written mainly in Python. It has been in active development since 2022. Gymnasium is available under the MIT license. Its main topics are api, gym, reinforcement-learning.

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Frequently asked questions

What is Gymnasium?

A standard API for single-agent reinforcement learning environments, with popular reference environments and related utilities (formerly Gym)

Is Gymnasium open source?

Gymnasium is an open-source project. It is released under the MIT license.

Is Gymnasium free?

Yes. Gymnasium is free and open source — you can use, modify and self-host it.

What license does Gymnasium use?

Gymnasium is available under the MIT license.

What language is Gymnasium written in?

Gymnasium is written mainly in Python.

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