What is the difference between GPT-5.1-Codex and GPT-5.6 Luna?

Both are developed by OpenAI but target different use cases. GPT-5.1-Codex has a 400K token context window vs GPT-5.6 Luna's 1.1M. 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 GPT-5.6 Luna?

It depends on your use case. GPT-5.1-Codex and GPT-5.6 Luna 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 GPT-5.6 Luna?

GPT-5.1-Codex costs $1.25/M input tokens and GPT-5.6 Luna costs $1/M input tokens. GPT-5.6 Luna is $0.25/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 GPT-5.6 Luna on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex and GPT-5.6 Luna 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 GPT-5.6 Luna?

Both are developed by OpenAI but target different use cases. GPT-5.1-Codex has a 400K token context window vs GPT-5.6 Luna's 1.1M. 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 GPT-5.6 Luna?

It depends on your use case. GPT-5.1-Codex and GPT-5.6 Luna 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 GPT-5.6 Luna?

GPT-5.1-Codex costs $1.25/M input tokens and GPT-5.6 Luna costs $1/M input tokens. GPT-5.6 Luna is $0.25/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 GPT-5.6 Luna on Rival?

This page shows a side-by-side comparison of GPT-5.1-Codex and GPT-5.6 Luna 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.