WeiboAI

weights

open(MIT)

base

open_weights(Qwen2.5)

data

partial(RL/SFT data not fully released)

license

MIT

MIT-licensed weights, but a fine-tune of the open-weight Qwen2.5 line without a fully open/reproducible data+training pipeline -> open_weights tier, not open_source.

• https://huggingface.co/WeiboAI/VibeThinker-3B recorded 2026-06-30

  VibeThinker-3B; MIT license; fine-tuned from Qwen2.5-3B / Qwen2.5-Coder-3B