OpenAI · GPT series

GPT-6 Luna

Released 22 Sep 2026 · 0 days after GPT-6 Astra

notable release

Cheapest tier of the GPT-6 line.

Intelligence

27.9

#12 of 21 scored releases to that date

Price

$0.20

per 1M tokens, 3:1 in/out · $0.1 in / $0.5 out

Speed

126

output tokens/s, median

Weights

Closed

US lab

OpenAI’s best score over time