What is the difference between GPT Image 2.5 Sunburst and Seedream 4.5?

GPT Image 2.5 Sunburst is developed by OpenAI while Seedream 4.5 is developed by ByteDance. 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 Seedream 4.5?

It depends on your use case. GPT Image 2.5 Sunburst and Seedream 4.5 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 Seedream 4.5 on Rival?

This page shows a side-by-side comparison of GPT Image 2.5 Sunburst and Seedream 4.5 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 SunburstvsSeedream 4.5

GPT Image 2.5 Sunburst is the newer model, released after Seedream 4.5.

GPT Image 2.5 Sunburst and Seedream 4.5 compared across 19 shared prompts
Spec	GPT Image 2.5 Sunburst	Seedream 4.5
Input price	$5/M tokens	—
Output price	$30/M tokens	—
Parameters	Not disclosed	Not disclosed
Weights	Closed	—
Free API (OpenRouter)	No	—
Released	Sep 2026	Dec 2025