GPT5_2Codex
GPT-5.2-Codex is an upgraded version of GPT-5.2 optimized for agentic coding tasks in Codex or similar environments. GPT-5.2-Codex supports low, medium, high, and xhigh reasoning effort settings.
400,000 context window 128,000 max output tokens Aug 31, 2025 knowledge cutoff Reasoning token support