Qwen's blog post is dated April 29, 2025 and opens "Today, we are excited to announce the release of Qwen3"; Alibaba Group's[3] English release is dated April 29, 2025, TechCrunch[4] published at 2:37 PM PDT on April 28 and OpenRouter[5] lists Qwen3 32B at 28 April (UTC), the same launch seen from US time.
Alibaba's Qwen team open-sources the Qwen3 family under Apache 2.0, six dense models from 0.6B to 32B and two mixture-of-experts models (30B-A3B and 235B-A22B), with switchable thinking and non-thinking modes and 119 languages; the dense flagship Qwen3-32B scores 93.8 on Arena-Hard in thinking mode.