← Artificial Acceleration
OpenAI · GPT series
GPT-5 Codex
Released
23 Sep 2025
· 47 days after
GPT-5 nano
Intelligence
—
no index score yet
Price
$3.44
per 1M tokens, 3:1 in/out · $1.25 in / $10 out
Speed
—
not measured
Weights
Closed
US lab
OpenAI’s best score over time
9 Jul 2026
26 Oct 2026
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GPT-5 nano
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GPT-5.1