FLUX.3 Image vs 
GPT Image 2.5 Sunburst
FLUX.3 Image is the newer model, released after GPT Image 2.5 Sunburst.
Hyperrealistic Portrait
One prompt, one photorealistic portrait. Skin, eyes, light.
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Which answer wins?
Price and specs
| Spec | FLUX.3 Image | GPT Image 2.5 Sunburst |
|---|---|---|
| Input price | — | $5/M tokens |
| Output price | — | $30/M tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Oct 2026 | Sep 2026 |
| At 10M a month | not listed | $50.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
FLUX.3 Image1 host
GPT Image 2.5 Sunburst1 host
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between FLUX.3 Image and GPT Image 2.5 Sunburst?
FLUX.3 Image is developed by Black Forest Labs while GPT Image 2.5 Sunburst is developed by OpenAI. You can compare their actual outputs across 19 challenges on Rival to see how they differ in practice.
Which is better, FLUX.3 Image or GPT Image 2.5 Sunburst?
It depends on your use case. FLUX.3 Image and GPT Image 2.5 Sunburst 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 FLUX.3 Image and GPT Image 2.5 Sunburst on Rival?
This page shows a side-by-side comparison of FLUX.3 Image 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.
More comparisons
Against the newest arrivals
- FLUX.3 Image vs Hy Image 3.5 PreviewLanded Oct 2026
- GPT Image 2.5 Sunburst vs Nano Banana 2.1Landed Oct 2026
- FLUX.3 Image vs Recraft V4.1 FlashLanded Sep 2026
- GPT Image 2.5 Sunburst vs GPT Image 2.5 FlareLanded Sep 2026
- FLUX.3 Image vs Nano Banana 2 LiteLanded Jun 2026
- GPT Image 2.5 Sunburst vs Riverflow V2.5 FastLanded Jun 2026
- FLUX.3 Image vs Riverflow V2.5 ProLanded Jun 2026
- GPT Image 2.5 Sunburst vs Recraft V4.1Landed May 2026
Same lab, same size, long tail
- FLUX.3 Image vs FLUX 2 MaxVersion compare
- FLUX.3 Image vs FLUX Kontext MaxSame lab
- GPT Image 2.5 Sunburst vs GPT Image 2Same lab
- GPT Image 2.5 Sunburst vs GPT Image 1.5Same lab
- FLUX.3 Image vs Recraft V4.1 ProSame size
- FLUX.3 Image vs Riverflow V2.5 FastSame size
- FLUX.3 Image vs Stable Diffusion XLSame size
- FLUX.3 Image vs Seedream 4Same size
