Addendum to GPT-5 system card: GPT-5-Codex
OpenAI releases GPT-5-Codex, a coding-optimized variant of GPT-5 with dynamic thinking effort that scales with task complexity for agentic coding.
Excerpt
This addendum to the GPT-5 system card shares a new model: GPT-5-Codex, a version of GPT-5 further optimized for agentic coding in Codex. GPT-5-Codex adjusts its thinking effort more dynamically based on task complexity, responding quickly to simple conversational queries or small tasks, while independently working for longer on more complex tasks.
Read at source: https://openai.com/index/gpt-5-system-card-addendum-gpt-5-codex