4 ms·

Another possible reason is that the number 4 is considered unlucky in traditional Chinese culture.

• zozbot234 13d ago
  Parent commenter hinted at that. Yet DeepSeek has released their V4 which was hugely successful, and even their new architecture is marked V4.1. Qwen internals mark their Flash-Next model, also very compelling, as "qwen4exp". So both of them are bucking the negative stereotype.