What is the difference between GPT-5.1 and Sonar Pro Search?

GPT-5.1 is developed by OpenAI while Sonar Pro Search is developed by Perplexity. GPT-5.1 has a 400K token context window vs Sonar Pro Search's 200K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1 or Sonar Pro Search?

It depends on your use case. GPT-5.1 and Sonar Pro Search 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 cost compared to Sonar Pro Search?

GPT-5.1 costs $1.25/M input tokens and Sonar Pro Search costs $3/M input tokens. GPT-5.1 is $1.75/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 and Sonar Pro Search on Rival?

This page shows a side-by-side comparison of GPT-5.1 and Sonar Pro Search 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-5.1vsSonar Pro Search

GPT-5.1 is cheaper than Sonar Pro Search at $1.25/M vs $3/M input tokens.

GPT-5.1 and Sonar Pro Search compared across 52 shared prompts
Spec	GPT-5.1	Sonar Pro Search
Input price	$1.25/M tokens	$3/M tokens
Output price	$10/M tokens	$15/M tokens
Context window	400K tokens	200K tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Nov 2025	Oct 2025