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

Gemini 3.6 Flash is developed by Google AI while GPT-5.1-Codex is developed by OpenAI. Gemini 3.6 Flash has a 1.0M token context window vs GPT-5.1-Codex's 400K. 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?

It depends on your use case. Gemini 3.6 Flash and GPT-5.1-Codex 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 much does Gemini 3.6 Flash cost compared to GPT-5.1-Codex?

Gemini 3.6 Flash costs $1.5/M input tokens and GPT-5.1-Codex costs $1.25/M input tokens. GPT-5.1-Codex is $0.25/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 3.6 Flash and GPT-5.1-Codex on Rival?

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

GPT-5.1-Codex is cheaper than Gemini 3.6 Flash at $1.25/M vs $1.5/M input tokens.

Gemini 3.6 Flash and GPT-5.1-Codex compared across 52 shared prompts
Spec	Gemini 3.6 Flash	GPT-5.1-Codex
Input price	$1.5/M tokens	$1.25/M tokens
Output price	$7.5/M tokens	$10/M tokens
Context window	1.0M tokens	400K tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Jul 2026	Nov 2025