What is the difference between Mercury 2 and OpenAI o3?

Mercury 2 is developed by Inception while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Mercury 2 or OpenAI o3?

It depends on your use case. Mercury 2 and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Mercury 2 cost compared to OpenAI o3?

Mercury 2 costs $0.25/M input tokens and OpenAI o3 costs $10/M input tokens. Mercury 2 is $9.75/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 Mercury 2 and OpenAI o3 on Rival?

This page shows a side-by-side comparison of Mercury 2 and OpenAI o3 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

Mercury 2vsOpenAI o3

Mercury 2 is cheaper than OpenAI o3 at $0.25/M vs $10/M input tokens.

Mercury 2 and OpenAI o3 compared across 53 shared prompts
Spec	Mercury 2	OpenAI o3
Input price	$0.25/M tokens	$10/M tokens
Output price	$0.75/M tokens	$40/M tokens
Context window	128K tokens	—
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Mar 2026	Apr 2025