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 training data and full training code are not released, so open_weights not open_source. Apache-2.0 confirmed on HF base cards 2026-06-04.

• https://huggingface.co/01-ai/Yi-1.5-34B recorded 2026-06-04

  Apache-2.0 license, 34B base model (base vs chat variants listed), downloadable weights

• https://huggingface.co/01-ai/Yi-1.5-9B recorded 2026-06-04

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