I actually just finished running the Text-to-Image benchmark a few minutes ago. This matches my own testing as well. GPT-Image 1.5 is clearly a step up as an editing model, but it performed worse in purely generative tasks compared to its predecessor - dropping from 11 (out of 14) to 9.

Comparing NB Pro, GPT Image 1, and GPT Image 1.5

https://genai-showdown.specr.net/?models=o4,nbp,g15