What is the difference between Gemini 2.5 Flash Preview and OpenAI o4-mini?

Gemini 2.5 Flash Preview is developed by Google AI while OpenAI o4-mini is developed by OpenAI. 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 OpenAI o4-mini?

It depends on your use case. Gemini 2.5 Flash Preview and OpenAI o4-mini 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 OpenAI o4-mini?

Gemini 2.5 Flash Preview costs $0.15/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. Gemini 2.5 Flash Preview is $0.95/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 OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview and OpenAI o4-mini 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 PreviewvsOpenAI o4-mini

Gemini 2.5 Flash Preview is cheaper than OpenAI o4-mini at $0.15/M vs $1.1/M input tokens.

Gemini 2.5 Flash Preview and OpenAI o4-mini compared across 27 shared prompts
Spec	Gemini 2.5 Flash Preview	OpenAI o4-mini
Input price	$0.15/M tokens	$1.1/M tokens
Output price	$0.6/M tokens	$4.4/M tokens
Context window	1.0M tokens	—
Parameters	Not disclosed	Not disclosed
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Apr 2025	Apr 2025
SWE-bench Verified	60.4%	68.1%