Which is cheaper, GPT-5.6 Sol or GPT-6 Luna?

GPT-5.6 Sol lists at $4 input / $20 output per 1M tokens; GPT-6 Luna lists at $0.10 input / $0.50 output per 1M tokens. GPT-6 Luna has the lower list price.

Which is used more, GPT-5.6 Sol or GPT-6 Luna?

GPT-6 Luna, with 1.4% of the AI-written code reviewed by cubic in the week of Oct 12, 2026, against 0.4% for GPT-5.6 Sol.

Updated Oct 20, 2026

GPT-5.6 Sol vs GPT-6 Luna

GPT-5.6 Sol is no longer ranked because it now writes under 0.5% of AI-attributed lines.

GPT-5.6 Sol and GPT-6 Luna compared on relative bug rate and on price and usage.
Bug rate
	GPT-5.6 Sol	GPT-6 Luna
Relative bug rate	No longer ranked	0.45
Details
Provider	OpenAI	OpenAI
Released	Jul 9, 2026	Sep 22, 2026
List price	$4 input / $20 output per 1M tokens	$0.10 input / $0.50 output per 1M tokens
Share of AI-written code, week of Oct 12	0.4%	1.4%

1.00 = average · lower is better

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Questions and answers

Which has fewer bugs, GPT-5.6 Sol or GPT-6 Luna?: GPT-5.6 Sol is no longer ranked because it now writes under 0.5% of AI-attributed lines.
Which is cheaper, GPT-5.6 Sol or GPT-6 Luna?: GPT-5.6 Sol lists at $4 input / $20 output per 1M tokens; GPT-6 Luna lists at $0.10 input / $0.50 output per 1M tokens. GPT-6 Luna has the lower list price.
Which is used more, GPT-5.6 Sol or GPT-6 Luna?: GPT-6 Luna, with 1.4% of the AI-written code reviewed by cubic in the week of Oct 12, 2026, against 0.4% for GPT-5.6 Sol.