FLUX.3 Image vs 
Imagen 4 Fast
FLUX.3 Image is the newer model, released after Imagen 4 Fast.
Hyperrealistic Portrait
One prompt, one photorealistic portrait. Skin, eyes, light.
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Which answer wins?
Price and specs
| Spec | FLUX.3 Image | Imagen 4 Fast |
|---|---|---|
| Free API (OpenRouter) | No | — |
| Released | Oct 2026 | Jun 2025 |
Where to run it
FLUX.3 Image1 host
Imagen 4 Fast
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between FLUX.3 Image and Imagen 4 Fast?
FLUX.3 Image is developed by Black Forest Labs while Imagen 4 Fast is developed by Google AI. You can compare their actual outputs across 17 challenges on Rival to see how they differ in practice.
Which is better, FLUX.3 Image or Imagen 4 Fast?
It depends on your use case. FLUX.3 Image and Imagen 4 Fast 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 FLUX.3 Image and Imagen 4 Fast on Rival?
This page shows a side-by-side comparison of FLUX.3 Image and Imagen 4 Fast 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
- Imagen 4 Fast vs Nano Banana 2.1Landed Oct 2026
- FLUX.3 Image vs Recraft V4.1 FlashLanded Sep 2026
- Imagen 4 Fast vs GPT Image 2.5 SunburstLanded Sep 2026
- FLUX.3 Image vs GPT Image 2.5 FlareLanded Sep 2026
- Imagen 4 Fast vs Nano Banana 2 LiteLanded Jun 2026
- FLUX.3 Image vs Riverflow V2.5 FastLanded Jun 2026
- Imagen 4 Fast vs Riverflow V2.5 ProLanded Jun 2026
Same lab, same size, long tail
- FLUX.3 Image vs FLUX 2 MaxVersion compare
- FLUX.3 Image vs FLUX Kontext MaxSame lab
- Imagen 4 Fast vs Nano Banana 2Same lab
- Imagen 4 Fast vs Hy Image 3.5 PreviewSame size
- FLUX.3 Image vs GPT Image 2Same size
- FLUX.3 Image vs GPT Image 2.5 SunburstSame size
- FLUX.3 Image vs Grok Imagine ImageSame size
- FLUX.3 Image vs HiDream L1 (Fast)Same size
