What is the difference between Mercury and OpenAI o3?

Mercury is developed by Inception while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Mercury or OpenAI o3?

It depends on your use case. Mercury and OpenAI o3 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 Mercury cost compared to OpenAI o3?

Mercury costs $10/M input tokens and OpenAI o3 costs $10/M input tokens. OpenAI o3 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 Mercury and OpenAI o3 on Rival?

This page shows a side-by-side comparison of Mercury 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 Jun 2025

MercuryvsOpenAI o3

Mercury is the newer model, released after OpenAI o3.

Mercury and OpenAI o3 compared across 54 shared prompts
Spec	Mercury	OpenAI o3
Input price	$10/M tokens	$10/M tokens
Output price	$10/M tokens	$40/M tokens
Context window	32K tokens	—
Parameters	Not disclosed	Not disclosed
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Jun 2025	Apr 2025