OpenAI · GPT series

GPT-5.5 Instant (May 2026)

Released 5 May 2026 · 12 days after GPT-5.5 Pro

Intelligence

—

no index score yet

Price

$11.25

per 1M tokens, 3:1 in/out · $5 in / $30 out

Speed

—

not measured

Weights

Closed

US lab

OpenAI’s best score over time