GPT Image 1.5 (Medium) is the newer model, released after Fibo.
Fibo and GPT Image 1.5 (Medium) compared across 10 shared prompts
Spec
Fibo
GPT Image 1.5 (Medium)
Weights
Open
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Released
Dec 2025
Dec 2025
Our Verdict
Fibo
GPT Image 1.5 (Medium)
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
Research
What we learned reading every model
FAQ
Common questions
Fibo is developed by Bria while GPT Image 1.5 (Medium) is developed by OpenAI. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.
It depends on your use case. Fibo and GPT Image 1.5 (Medium) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.
This page shows a side-by-side comparison of Fibo and GPT Image 1.5 (Medium) 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.