Install CODEXIDE in Eclipse

CODEXIDE can be installed straight from an Eclipse update site. It takes about two minutes.

Before you start

Prerequisites

Make sure these 2 things are ready. CODEXIDE drives the official Codex under the hood and reuses the account you already linked there, so a working command-line codex is what makes everything else possible.

1. Codex installed & signed in

Install the OpenAI Codex CLI and run it at least once from a terminal so it opens the browser sign-in and links your ChatGPT account to the tool. CODEXIDE reuses that same authenticated session, if the codex command works in your terminal, it will work in Eclipse.

2. Eclipse 2025 or newer

Use a recent Eclipse IDE release (2025 or later). Any package that supports Java development works : Eclipse IDE for Java Developers, for Enterprise Java, RCP, and so on.

Step by step

Install from the update site

Register the CODEXIDE update site in Eclipse, then let the standard installer do the rest.

1

Open the installer

In Eclipse, go to the menu Help → Install New Software…

2

Add the update site

Click Add… next to the Work with field. In the dialog, give it a name (for example CODEXIDE) and paste this location:

https://www.codexide.org/eclipse/update

Then click Add to confirm.

3

Select the CODEXIDE feature

Eclipse fetches the site and lists the available feature. Tick the CODEXIDE feature checkbox. If the list looks empty, make sure Group items by category is unchecked, then click Next.

4

Review and accept the license

Confirm the install details on the next screen, accept the terms of the license agreement, and click Finish. Eclipse downloads and installs the plugin.

5

Trust and restart

If a security warning about unsigned or self-signed content appears, choose to trust it and continue. When prompted, restart Eclipse to finish the installation.

6

Open the Codex view

After the restart, open Window → Show View → Other… and pick a Codex view. You are ready to chat, plan and refactor without leaving your IDE.

Staying up to date: once the update site is registered, you can install newer versions at any time from Help → Check for Updates — Eclipse pulls the latest CODEXIDE release from the same location.
Not seeing any results? Double-check that the update site URL is exactly https://www.codexide.org/eclipse/update, that your machine can reach it (corporate proxies may block it), and that Codex runs from your terminal so its authentication is in place.