OpenAI · GPT series

GPT-5.6 Luna

Released 9 Jul 2026 · 0 days after GPT-5.5 Instant (June 2026)

Intelligence

23.8

#2 of 4 scored releases to that date

Price

$0.45

per 1M tokens, 3:1 in/out · $0.2 in / $1.2 out

Speed

—

not measured

Weights

Closed

US lab

OpenAI’s best score over time