GPT-5. 3-Codex is a Codex-native agent that pairs frontier coding performance with general reasoning to support long-horizon, real-world technical work.
How engineers at Nextdoor use Codex with GPT-5. 5 to investigate hard-to-reproduce issues, build across platforms, and focus on product outcomes.
Teams use Codex with GPT-5. 5 to ship production systems and turn research ideas into runnable experiments.
Introducing GPT-5. 1-Codex-Max, a faster, more intelligent agentic coding model for Codex.
How Braintrust engineers use Codex with GPT-5. 5 to run experiments and code faster.
Introducing GPT-5 in our API platform—offering high reasoning performance, new controls for devs, and best-in-class results on real coding tasks.