The top alternative to GPT-Image 1.5 is GPT Image 2 API, rated 1338 Elo (#1 of 155) in the Image Arena, followed by Reve 2.1 (1305 Elo) (GPT-Image 1.5 itself ranks #6 of 155 at 1256 Elo).
GPT Image 2 API is the highest-ranked text to image alternative, with 1338 Elo (#1 of 155) in the Image Arena from blind human-preference votes. The full ranking below lists 15 alternatives.
All models here compete in the same human-preference arena as GPT-Image 1.5, which holds 1256 Elo at rank #6 — open any model page or a head-to-head compare link for the direct matchup.