Addendum to GPT-5 system card: GPT-5-Codex

This addendum to the GPT-5 system card shares a brand new mannequin: GPT-5-Codex, a model of GPT-5 additional optimized for agentic coding in Codex. GPT-5-Codex adjusts its pondering effort extra dynamically based mostly on job complexity, responding shortly to easy conversational queries or small duties, whereas independently working for longer on extra complicated duties.