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

The released model, GPT-5-Codex, is an optimized variant of GPT-5 specifically designed for agentic coding tasks. It features a dynamic adjustment mechanism for thinking effort based on task complexity, allowing for rapid responses to simpler queries while extending processing time for more complex tasks. This model enhancement is significant for practitioners as it improves efficiency in coding applications, enabling more effective handling of diverse task complexities.