What is the difference between Gemini 3.5 Flash and OpenAI o4 Mini High?

Gemini 3.5 Flash is developed by Google AI while OpenAI o4 Mini High is developed by OpenAI. Gemini 3.5 Flash has a 1.0M token context window vs OpenAI o4 Mini High's 200K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3.5 Flash or OpenAI o4 Mini High?

It depends on your use case. Gemini 3.5 Flash and OpenAI o4 Mini High each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Gemini 3.5 Flash cost compared to OpenAI o4 Mini High?

Gemini 3.5 Flash costs $1.5/M input tokens and OpenAI o4 Mini High costs $1.1/M input tokens. OpenAI o4 Mini High is $0.40/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 3.5 Flash and OpenAI o4 Mini High on Rival?

This page shows a side-by-side comparison of Gemini 3.5 Flash and OpenAI o4 Mini High 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 May 2026

Gemini 3.5 FlashvsOpenAI o4 Mini High

OpenAI o4 Mini High is cheaper than Gemini 3.5 Flash at $1.1/M vs $1.5/M input tokens.

Gemini 3.5 Flash and OpenAI o4 Mini High compared across 53 shared prompts
Spec	Gemini 3.5 Flash	OpenAI o4 Mini High
Input price	$1.5/M tokens	$1.1/M tokens
Output price	$9/M tokens	$4.4/M tokens
Context window	1.0M tokens	200K tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2026	Apr 2025