What is the difference between GPT-5.1 Chat and Mistral Small 4?

GPT-5.1 Chat is developed by OpenAI while Mistral Small 4 is developed by Mistral AI. GPT-5.1 Chat has a 128K token context window vs Mistral Small 4's 262K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 Chat or Mistral Small 4?

It depends on your use case. GPT-5.1 Chat and Mistral Small 4 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 GPT-5.1 Chat cost compared to Mistral Small 4?

GPT-5.1 Chat costs $1.25/M input tokens and Mistral Small 4 costs $0.15/M input tokens. Mistral Small 4 is $1.10/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-5.1 Chat and Mistral Small 4 on Rival?

This page shows a side-by-side comparison of GPT-5.1 Chat and Mistral Small 4 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 Mar 2026

GPT-5.1 ChatvsMistral Small 4

Mistral Small 4 is cheaper than GPT-5.1 Chat at $0.15/M vs $1.25/M input tokens.

GPT-5.1 Chat and Mistral Small 4 compared across 52 shared prompts
Spec	GPT-5.1 Chat	Mistral Small 4
Input price	$1.25/M tokens	$0.15/M tokens
Output price	$10/M tokens	$0.6/M tokens
Context window	128K tokens	262K tokens
Weights	—	Open
Free API (OpenRouter)	No	No
Released	Nov 2025	Mar 2026