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Vibe Check: We Tested OpenAI's New Codex App

Our hands-on review of the company’s desktop coding tool based on a week of testing

Unlocking the Codex harness: how we built the App Server

OpenAI’s coding agent Codex exists across many different surfaces: the web app⁠(opens in a new window), the CLI⁠(opens in a new window), the IDE extension⁠(opens in a new window), and the new Codex macOS app. Under the hood, they’re all powered by the same Codex harness—the agent loop and logic that underlies all Codex experiences. The critical link between them? The Codex App Server⁠(opens in a new window), a client-friendly, bidirectional JSON-RPC1 API.

Vibe Check: OpenAI's Codex App Gains Ground on Claude Code

OpenAI nailed the interface. But it's built for hardcore engineering.

OpenAI picks up pace against Claude Code with new Codex desktop app

The macOS app does everything the CLI, IDE, and web interfaces do.

OpenAI launches new MacOS app for agentic coding

OpenAI has released a new MacOS app for Codex, integrating many of the agentic coding practices that have become popular since Codex launched last year.

OpenAI's Codex app: When your IDE gets a brain

OpenAI has given software developers a new desktop toy, and judging by the early reactions, it might feel like someone finally handed coders the Swiss Army knife they’ve been dreaming about or the kind of gadget that makes them wonder if they’re working with a robot coworker now.