GPT-5 ProvsMercury 2.5

GPT-5 Pro is developed by OpenAI while Mercury 2.5 is developed by Inception. GPT-5 Pro has a 400K token context window vs Mercury 2.5's 260K. You can compare their actual outputs across 20 challenges on Rival to see how they differ in practice.

It depends on your use case. GPT-5 Pro and Mercury 2.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 20 challenges so you can judge which fits your needs best.

GPT-5 Pro costs $15/M input tokens and Mercury 2.5 costs $0.04/M input tokens. Mercury 2.5 is $14.96/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of GPT-5 Pro and Mercury 2.5 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.