01.AI

weights

open(Apache-2.0, on HF)

data

closed(pretraining corpus not released)

code

partial(inference/usage examples

license

Apache-2.0(OSI, permissive, no use restrictions)

Permissive Apache-2.0 weights, but the training data and the full training code are not released, so this is open weights rather than open source.

• https://huggingface.co/01-ai/Yi-1.5-34B recorded 2026-08-13

  license apache-2.0, 34B base model (base vs chat variants listed), downloadable weights, no training corpus named on the card

• https://huggingface.co/01-ai/Yi-1.5-9B recorded 2026-08-13

  license apache-2.0, 9B base model, base/chat variants listed

• https://api.github.com/repos/01-ai/Yi-1.5 recorded 2026-08-13

  `private: false`, `archived: false`, license `Apache-2.0`, 561 stars, last pushed 2024-11-11. Usage examples only, no training pipeline, which is what holds `code` at partial.