OpenAI has unveiled a new tool called Codex CLI alongside the introduction of two new models, o3 and o4-mini, which are coding assistant agents that run locally through the Terminal on users’ computers.
Codex CLI is a small agent that supports input in a mixed data format, from pasting screen captures for reading command lines, outlines, to reading code running on devices. OpenAI states that this tool is designed to leverage the maximum efficiency of o3 and o4-mini models and will support the GPT-4.1 model through an API.
Codex CLI is an open-source program, and more details can be found on GitHub.
TLDR: OpenAI presents Codex CLI, a new coding tool, and introduces two new models, o3 and o4-mini, as coding assistant agents that optimize code writing efficiency and support the GPT-4.1 model through an API.
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