One sentence: a man in an empty Phoenix parking lot at 12:30 p.m. in late June. The prompt never mentions the sun or a shadow. At that time the sun is about 80° up, so his shadow is a small pool at his feet. Models like long, dramatic shadows.
On the models. Nano Banana 2.1 and Nano Banana 2 emit image and text and run as ordinary chat models; Seedream and the Flux models emit only an image and go through OpenRouter's images endpoint. Nano Banana 2.1 thinks at minimal effort by default; a round run at high is a separate round and says so in its batch label.
A photograph of a man standing in the middle of an empty asphalt parking lot in Phoenix, Arizona, at 12:30 p.m. on a cloudless day in late June.