What is the difference between Gemini 2.5 Flash Preview and GPT-4o (Omni)?

Gemini 2.5 Flash Preview is developed by Google AI while GPT-4o (Omni) is developed by OpenAI. Gemini 2.5 Flash Preview has a 1.0M token context window vs GPT-4o (Omni)'s 128K. You can compare their actual outputs across 27 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview or GPT-4o (Omni)?

It depends on your use case. Gemini 2.5 Flash Preview and GPT-4o (Omni) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 27 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview cost compared to GPT-4o (Omni)?

Gemini 2.5 Flash Preview costs $0.15/M input tokens and GPT-4o (Omni) costs $2.5/M input tokens. Gemini 2.5 Flash Preview is $2.35/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Flash Preview and GPT-4o (Omni) on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview and GPT-4o (Omni) 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 Apr 2025

Gemini 2.5 Flash PreviewvsGPT-4o (Omni)

Gemini 2.5 Flash Preview is cheaper than GPT-4o (Omni) at $0.15/M vs $2.5/M input tokens.

Gemini 2.5 Flash Preview and GPT-4o (Omni) compared across 27 shared prompts
Spec	Gemini 2.5 Flash Preview	GPT-4o (Omni)
Input price	$0.15/M tokens	$2.5/M tokens
Output price	$0.6/M tokens	$10/M tokens
Context window	1.0M tokens	128K tokens
Parameters	Not disclosed	Not disclosed
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Apr 2025	May 2024