What is the difference between Gemini 3.6 Flash and GPT-5.1 Codex Max?

Gemini 3.6 Flash is developed by Google AI while GPT-5.1 Codex Max is developed by OpenAI. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, Gemini 3.6 Flash or GPT-5.1 Codex Max?

It depends on your use case. Gemini 3.6 Flash and GPT-5.1 Codex Max each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How can I compare Gemini 3.6 Flash and GPT-5.1 Codex Max on Rival?

This page shows a side-by-side comparison of Gemini 3.6 Flash and GPT-5.1 Codex Max 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 Jul 2026

Gemini 3.6 FlashvsGPT-5.1 Codex Max

Gemini 3.6 Flash is the newer model, released after GPT-5.1 Codex Max.

Gemini 3.6 Flash and GPT-5.1 Codex Max compared across 52 shared prompts
Spec	Gemini 3.6 Flash	GPT-5.1 Codex Max
Input price	$1.5/M tokens	—
Output price	$7.5/M tokens	—
Context window	1.0M tokens	—
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Jul 2026	Dec 2025