GPT Codex series

Each model's score on the Intelligence board (Intelligence Index) on the last day it was listed

1. GPT-5.3 CodexReleased Feb 5, 202632.5#67 · ▲ 4.0
2. GPT-5.2 CodexReleased Dec 11, 202528.5#128 · ▲ 4.8
3. GPT-5.1 CodexReleased Nov 13, 202523.7#181 · ▼ 1.2
4. GPT-5 CodexNo longer on the boardsReleased Sep 23, 202524.9#164

• Aug 112026AI modelsResearchers crack hidden reasoning across OpenAI, Anthropic, and Google APIs
• May 62026IndustryMira Murati testifies Sam Altman lied about AI model safety checks
• Feb 202024AI modelsAndrej Karpathy drops a 2-hour masterclass on building GPT tokenizers
• Sep 202023IndustryGeorge R.R. Martin and bestselling authors sue OpenAI
• Sep 112023IndustryPulitzer-winning authors are suing OpenAI again
• May 172023IndustryOpenAI targets domains using 'GPT'