What is the difference between GPT Image 2.5 Sunburst and Imagen 4 Ultra?

GPT Image 2.5 Sunburst is developed by OpenAI while Imagen 4 Ultra is developed by Google AI. You can compare their actual outputs across 19 challenges on Rival to see how they differ in practice.

Which is better, GPT Image 2.5 Sunburst or Imagen 4 Ultra?

It depends on your use case. GPT Image 2.5 Sunburst and Imagen 4 Ultra each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 19 challenges so you can judge which fits your needs best.

How can I compare GPT Image 2.5 Sunburst and Imagen 4 Ultra on Rival?

This page shows a side-by-side comparison of GPT Image 2.5 Sunburst and Imagen 4 Ultra across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Sep 2026

GPT Image 2.5 SunburstvsImagen 4 Ultra

GPT Image 2.5 Sunburst is the newer model, released after Imagen 4 Ultra.

GPT Image 2.5 Sunburst and Imagen 4 Ultra compared across 19 shared prompts
Spec	GPT Image 2.5 Sunburst	Imagen 4 Ultra
Input price	$5/M tokens	—
Output price	$30/M tokens	—
Parameters	Not disclosed	Not disclosed
Weights	Closed	—
Free API (OpenRouter)	No	—
Released	Sep 2026	May 2025