Alibaba's open-weights frontier family — Qwen3 and QwQ rival closed models on math and code. The de-facto open base model for a lot of fine-tunes.
From Wikipedia
Qwen is a family of large language models developed by Alibaba Cloud. Many Qwen models are distributed under the free and open-source Apache 2.0 license, the source-available Qwen License, or the non-commercial Qwen Research License; other proprietary Qwen models are served through Alibaba Cloud.