What is the difference between GPT-3.5 Turbo and GPT-5.1-Codex-Mini?

Both are developed by OpenAI but target different use cases. GPT-3.5 Turbo has a 16K token context window vs GPT-5.1-Codex-Mini's 400K. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, GPT-3.5 Turbo or GPT-5.1-Codex-Mini?

It depends on your use case. GPT-3.5 Turbo and GPT-5.1-Codex-Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does GPT-3.5 Turbo cost compared to GPT-5.1-Codex-Mini?

GPT-3.5 Turbo costs $1.5/M input tokens and GPT-5.1-Codex-Mini costs $1.5/M input tokens. GPT-5.1-Codex-Mini is $0.00/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 GPT-3.5 Turbo and GPT-5.1-Codex-Mini on Rival?

This page shows a side-by-side comparison of GPT-3.5 Turbo and GPT-5.1-Codex-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 Nov 2025

GPT-3.5 TurbovsGPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini has a larger context window than GPT-3.5 Turbo (400K tokens vs 16K tokens).

GPT-3.5 Turbo and GPT-5.1-Codex-Mini compared across 54 shared prompts
Spec	GPT-3.5 Turbo	GPT-5.1-Codex-Mini
Input price	$1.5/M tokens	$1.5/M tokens
Output price	$2/M tokens	$6/M tokens
Context window	16K tokens	400K tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Mar 2022	Nov 2025