FLUX.3 Image vs 
Riverflow V2.5 Fast
FLUX.3 Image is the newer model, released after Riverflow V2.5 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 | Riverflow V2.5 Fast |
|---|---|---|
| Input price | — | Free |
| Output price | — | Free |
| Context window | — | 8K tokens |
| Free API (OpenRouter) | No | No |
| Released | Oct 2026 | Jun 2026 |
| At 10M a month | not listed | $0 |
Input tokens at list price. No caching, no batch discount.
Where to run it
FLUX.3 Image1 host
Riverflow V2.5 Fast1 host
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between FLUX.3 Image and Riverflow V2.5 Fast?
FLUX.3 Image is developed by Black Forest Labs while Riverflow V2.5 Fast is developed by Sourceful. 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 Riverflow V2.5 Fast?
It depends on your use case. FLUX.3 Image and Riverflow V2.5 Fast 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 Riverflow V2.5 Fast on Rival?
This page shows a side-by-side comparison of FLUX.3 Image and Riverflow V2.5 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
- Riverflow V2.5 Fast vs Nano Banana 2.1Landed Oct 2026
- FLUX.3 Image vs Recraft V4.1 FlashLanded Sep 2026
- Riverflow V2.5 Fast vs GPT Image 2.5 SunburstLanded Sep 2026
- FLUX.3 Image vs GPT Image 2.5 FlareLanded Sep 2026
- Riverflow V2.5 Fast vs Nano Banana 2 LiteLanded Jun 2026
- FLUX.3 Image vs Riverflow V2.5 ProLanded Jun 2026
- Riverflow V2.5 Fast 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
- Riverflow V2.5 Fast vs Riverflow V2.5 ProSame lab
- Riverflow V2.5 Fast vs Hy Image 3.5 PreviewSame size
- FLUX.3 Image vs Ideogram v3 QualitySame size
- FLUX.3 Image vs Ideogram v3 TurboSame size
- FLUX.3 Image vs Bria Image 3.2Same size
- FLUX.3 Image vs Imagen 3Same size
