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OpenAI Codex CLI
@ OpenAI
04/16/25
Takeaways
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Romain Huet
04/16/25
@ OpenAI
I'm Romain Huet, and I work on developer experience at OpenAI, focusing on making developers feel delighted and inspired by our tools.
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Romain Huet
04/16/25
@ OpenAI
Today, we're excited to introduce Codex CLI, a lightweight coding agent that runs directly from your command line, allowing you to read, edit files, and build apps from scratch.
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Romain Huet
04/16/25
@ OpenAI
Codex CLI can run commands securely, enabling you to build features or complete applications efficiently.
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Fouad Matin
04/16/25
@ OpenAI
I'm Fouad Matin from the agents research team, and I'm thrilled to share Codex with you all, starting with a project like open.fm for our demo.
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Fouad Matin
04/16/25
@ OpenAI
Codex CLI works with all OpenAI models, including o3, o4-mini, and GPT-4.1, allowing you to ask it to explain codebases and run commands directly on your machine.
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Fouad Matin
04/16/25
@ OpenAI
When running Codex CLI in full auto mode, it can edit and run commands automatically while ensuring safety by operating in a network-disabled and sandboxed environment.
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Fouad Matin
04/16/25
@ OpenAI
As a developer, you can use Codex CLI to understand code and make specific edits seamlessly, enhancing your coding experience.
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Fouad Matin
04/16/25
@ OpenAI
After making changes, you can see the results immediately, such as switching an existing codebase to dark mode effortlessly.
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OpenAI Cast
04/16/25
@ OpenAI
I want to create something fun from scratch, like a complete app, similar to vibe coding.
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OpenAI Cast
04/16/25
@ OpenAI
I'm going to grab a screenshot of Photo Booth and pass it to Codex CLI to reimplement it in a single page HTML.
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OpenAI Cast
04/16/25
@ OpenAI
Codex CLI understands the context of the screenshot and can reimplement it without needing additional direction.
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OpenAI Cast
04/16/25
@ OpenAI
I can see Codex CLI's reasoning process as it thinks through the problem and executes commands.
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OpenAI Cast
04/16/25
@ OpenAI
With just one screenshot, Codex CLI understood exactly what I wanted to build without opening a code editor.
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OpenAI Cast
04/16/25
@ OpenAI
Codex CLI can read and edit files directly, run commands securely, and offers different modes for user comfort.
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OpenAI Cast
04/16/25
@ OpenAI
My favorite feature of Codex CLI is its multimodal reasoning, allowing it to generate code from sketches or notes.
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OpenAI Cast
04/16/25
@ OpenAI
Codex is fully open source, and you can explore the GitHub repository to understand more about it.
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OpenAI Cast
04/16/25
@ OpenAI
Codex works with GPT-4.1 and other models, and we're excited to see what you build with it.