PufferLib

Choose the version before choosing an API. Reviewed 2026-10-01:

Profile	Status	Main use
Native source `5.0`	Current default branch and live documentation	C/CUDA environments, native trainer; CPU evaluation only
`pufferlib==3.0.0`	Latest PyPI release, published 2025-06-23; sdist only	Python/Gymnasium/PettingZoo adaptation and Torch PuffeRL
Pinned source `4.0`	Historical snapshot	C Ocean interface with an optional Torch fallback

For 5.0, read references/native-5.md. The reviewed revision is 6ffa5b10dbbbe4d1e8288367c7d9d3acd3bad4a2. Its CLI is ./puffer train after building an environment, not puffer train ENV_NAME. There is no 5.0 Python emulation/vector API or --slowly fallback.

Installs

1.7K

Repository

k-dense-ai/scie…t-skills

GitHub Stars

47.6K

First Seen

Jan 20, 2026

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