Qwen3.5 - Open Source

Alibaba has open-sourced its Qwen3.5 model family, with the flagship 72B parameter version reportedly outperforming Meta's Llama 3.1 405B on key reasoning benchmarks like GPQA and MATH. The release includes five smaller models (0.5B to 32B) and features a massive 128K context window. This positions Qwen3.5 as a new top-tier, commercially usable open-source contender, directly challenging the dominance of models from Meta and Mistral in the open-weight arena.