What is the difference between GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 17 challenges on Rival to see how they differ in practice.

Which is better, GPT Image 1.5 (Medium) or GPT Image 2.5 Sunburst?

It depends on your use case. GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 17 challenges so you can judge which fits your needs best.

How can I compare GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst on Rival?

This page shows a side-by-side comparison of GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst 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 1.5 (Medium)vsGPT Image 2.5 Sunburst

GPT Image 2.5 Sunburst is the newer model, released after GPT Image 1.5 (Medium).

GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst compared across 17 shared prompts
Spec	GPT Image 1.5 (Medium)	GPT Image 2.5 Sunburst
Input price	—	$5/M tokens
Output price	—	$30/M tokens
Parameters	Not disclosed	Not disclosed
Weights	—	Closed
Free API (OpenRouter)	—	No
Released	Dec 2025	Sep 2026

Our Verdict

GPT Image 1.5 (Medium)

GPT Image 2.5 Sunburst

Not enough votes to call it. On the specs, nothing separates them.

Too close to call

API pricing

Cost per 1M tokens

GPT Image 1.5 (Medium)

Input

—

Output

—

GPT Image 2.5 Sunburst

Input

$5.00

Output

$30.00

Where to run it

1 host

GPT Image 1.5 (Medium)

No hosts listed on OpenRouter.

GPT Image 2.5 Sunburst1 host

HostInOutContextUptime

OpenAI$8.00 in$8.00 out400k98.6% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

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More comparisons

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst?

Which is better, GPT Image 1.5 (Medium) or GPT Image 2.5 Sunburst?

How can I compare GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst?

Which is better, GPT Image 1.5 (Medium) or GPT Image 2.5 Sunburst?

How can I compare GPT Image 1.5 (Medium) and GPT Image 2.5 Sunburst on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages