I've updated my GenAI Comparison site to include Imagen4 Ultra, so now we have four Google related generative models (Gemini Flash, Imagen3, Imagen4, and Imagen4 Ultra).

Despite claims that Ultra supports improved strict prompt adherence, we saw no evidence that it scored any better than Imagen 4 and in some cases seemed to ignore the prompt altogether (see the "Not the Bees" comic). In many cases, it also seemed much less steerable than Imagen3 requiring many of the prompts to be rewritten.

https://genai-showdown.specr.net?models=IMAGEN_3,IMAGEN_4,IM...