The most counterintuitive aspect of Qwen-Image-2.1 is the mismatch between its size and its results. According to a report by Machine Heart, its visual generation component has only 7B parameters, uses a 20-layer Single-Stream DiT, natively supports 2K resolution, yet achieved a total score of 60.28 in public evaluations, ranking first among open-source models. For comparison, in the same evaluation, Nano Banana 2.0 scored 59.82 and GPT Image 1.5 scored 59.65.
It should be noted that these scores come from public evaluation results relayed in the report, belonging to source_claim, and are not independently reproduced by a third party. But even looking only at the structure, the 7B generation module simultaneously accommodates image generation, transparent asset generation, and multi-image editing, meaning the starting point for developers to deploy and customize image tools is lighter.
More noteworthy is the inference optimization approach. The model uses mixed-granularity attention: the text part follows traditional token-level causal masking, computing word by word to ensure semantic coherence; the image generation part uses chunk-level masking and caches static context after the first step via KV Cache for subsequent reuse. In multi-image input scenarios, this design of reducing redundant computation is more pronounced, but how much time and memory it actually saves, the report also acknowledges, needs to be judged in conjunction with hardware, precision, resolution, and number of inputs.