GPT-5.6 Luna vs GPT-5.6 Terra

Both models are evenly matched

Arena ELO

Tie

Cheaper

Tie

Faster

Tie

Detailed Comparison

Category	GPT-5.6 Luna	GPT-5.6 Terra
Provider	OpenAI	OpenAI
Context Window	128K	128K
Input Price ($/1M)	$10	$10
Output Price ($/1M)	$30	$30
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 is cheaper, GPT-5.6 Luna or GPT-5.6 Terra?

GPT-5.6 Terra is approximately 0% cheaper than GPT-5.6 Luna per million tokens.

Which has a larger context window?

GPT-5.6 Luna supports 128K context, while GPT-5.6 Terra supports 128K.

Is GPT-5.6 Luna or GPT-5.6 Terra open source?

GPT-5.6 Luna is proprietary. GPT-5.6 Terra is proprietary.

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