Addendum to o3 and o4-mini system card: Codex

📰 OpenAI News

OpenAI's Codex is a cloud-based coding agent powered by codex-1, a version of OpenAI o3 optimized for software engineering

intermediate Published 16 May 2025

Action Steps

Ask Codex to perform coding tasks or answer questions about a codebase
Inspect the results and request refinements or export the generated diff
Use Codex to read and edit files, execute commands, and run tests within a cloud container
Validate Codex's work through citations of terminal logs and files

Who Needs to Know This

Software engineers and developers can benefit from Codex as it can perform coding tasks, answer questions about a codebase, and provide verifiable evidence of its actions

Key Insight

💡 Codex is trained to provide verifiable evidence of its actions, allowing users to validate its work