GPT-4.1 Nano vs GPT-5.6 Luna

GPT-4.1 Nano leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

GPT-4.1 Nano

Faster

Tie

Detailed Comparison

Category	GPT-4.1 Nano	GPT-5.6 Luna
Provider	OpenAI	OpenAI
Context Window	128K	128K
Input Price ($/1M)	$0.1 WIN	N/A
Output Price ($/1M)	$0.4 WIN	N/A
Arena ELO	N/A	N/A
Coding	N/A	N/A
Reasoning	N/A	N/A
Speed (tokens/sec)	N/A	N/A
Open Source	No	No

Frequently Asked Questions

Which has a larger context window?

GPT-4.1 Nano supports 128K context, while GPT-5.6 Luna supports 128K.

Is GPT-4.1 Nano or GPT-5.6 Luna open source?

GPT-4.1 Nano is proprietary. GPT-5.6 Luna is proprietary.

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What We Know About GPT-5.6's Release Date

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