What is the difference between GPT-5.1-Codex and Mercury 2?

GPT-5.1-Codex is developed by OpenAI while Mercury 2 is developed by Inception. GPT-5.1-Codex has a 400K token context window vs Mercury 2's 128K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1-Codex or Mercury 2?

It depends on your use case. GPT-5.1-Codex and Mercury 2 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-Codex cost compared to Mercury 2?

GPT-5.1-Codex costs $1.25/M input tokens and Mercury 2 costs $0.25/M input tokens. Mercury 2 is $1.00/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 GPT-5.1-Codex and Mercury 2 on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex and Mercury 2 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.

What is the difference between GPT-5.1-Codex and Mercury 2?

GPT-5.1-Codex is developed by OpenAI while Mercury 2 is developed by Inception. GPT-5.1-Codex has a 400K token context window vs Mercury 2's 128K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.1-Codex or Mercury 2?

It depends on your use case. GPT-5.1-Codex and Mercury 2 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-Codex cost compared to Mercury 2?

GPT-5.1-Codex costs $1.25/M input tokens and Mercury 2 costs $0.25/M input tokens. Mercury 2 is $1.00/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 GPT-5.1-Codex and Mercury 2 on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex and Mercury 2 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.