Codex Autocomplete

Codex Autocomplete is a free, open-source Visual Studio Code extension that brings Cursor-style inline “ghost text” completions to VS Code using Codex OAuth.

Sign in with your Codex account to get AI-powered suggestions directly in the editor as you type. The extension is designed for fast, reliable inline completions, with clear controls for authentication, request behavior, latency, and overall reliability.

By using OAuth, teams can access Codex through their existing plan limits or credits instead of relying on separate pay-as-you-go API calls for every completion.

Because the project is open source, anyone can inspect the code, customize it for their workflow, and contribute improvements.

Currently, only macOS is supported. Windows support may be added in the future if there is enough demand.

[!WARNING] This is not an official OpenAI extension.

Why use Codex Autocomplete?

Codex Autocomplete is built for developers who want Codex-powered inline suggestions directly inside VS Code.

It is especially useful if you:

• Already use Codex and want in-editor ghost text while coding manually
• Want to use your existing plan limits or credits instead of separate pay-as-you-go API charges for each completion
• Want inline suggestions while writing code, Markdown, documentation, and plain text
• Want support for both full-line suggestions and partial-line completions
• Want more predictable suggestion behavior, with controls for trigger mode, latency, and request limits
• Want an open-source extension your team can review, customize, and extend

Highlights

• Codex OAuth login - Sign in with your existing Codex account
• Inline ghost text completions - Get suggestions directly in VS Code as you type
• Full-line and partial-line completion - Works across different coding and writing flows
• Configurable behavior - Tune trigger mode, latency handling, and request limits
• Open source - Review the implementation, adapt it to your needs, and contribute improvements

Get Started

Three easy steps to get started:

1. Install and verify the extension installation

   Open Visual Studio Code

   Install the extension

   Via extension marketplace

   • Open Extensions Panel (Cmd+Shift+X)
   • Search for 'codex autocomplete'
   • Click on install

2) Login to your Codex account - Open the Command Palette with (`Cmd/Ctrl+Shift+P`) - Run `Codex Autocomplete: Login` - Confirm login succeeded (notification: `Codex Autocomplete: logged in.`).

3. Trigger autocomplete

   • Open any code, markdown, or text file
   • Click on a line in the code
   • Press Ctrl+Alt+Space (Ctrl+Option+Space on macOS) to trigger inline ghost text Note: Option+Tab is also available, but Ctrl+Alt+Space is the more reliable shortcut to remember across environments
   • Tab to accept the suggestion

   Alternatively, use the try it out guide to try with an example code file.

Installation

For more detailed setup instructions see installation.md.

Core features

• Inline ghost-text autocomplete in the editor, with Tab to accept suggestions
• Returns full lines and completes partial lines of code, so suggestions can either finish the line you are on or continue into the next likely lines
• Support for code, markdown, and text files
• OAuth login flow with secure token storage in VS Code SecretStorage
• Flexible triggering modes with hotkey as the default and optional automatic mode
• Configurable behavior for completion rules, model and endpoint selection, context sizing, latency budgets, and rate limits

Developer/Maintainer features

The repository includes optional developer/maintainer workflows for debugging and validation:

• Built-in debug/testing workflows for bulk quality checks and response-time tracking
• Runtime-aligned benchmark CLIs that follow the hotkey-to-ghost-text pipeline by default
• Request/response observability with full request payload logs (redacted), full SSE stream logs, reconstructed response logging, and structured request summaries

For a more detailed feature breakdown, see features.md. For a high-level architecture and request-flow walkthrough, see how_it_works.md.

Commands

Use this when running extension commands from the Command Palette and reviewing their outputs/artifacts. Commands and command-output instructions are in commands.md.

Configuration

Use this to tune extension behavior, including completion rules, triggering, latency, context, endpoint and model settings, and logging.

Configuration instructions are in configuration.md.

How keys and tokens are stored

This extension does not require you to manage raw API keys in project files or environment variables for normal use.

• OAuth access and refresh tokens are stored in VS Code's encrypted SecretStorage
• Secrets are scoped to your local VS Code profile and managed through the extension's auth commands
• The repository does not persist your personal tokens in source-controlled files

Troubleshooting

Troubleshooting instructions are in troubleshooting.md.

Development workflow

If you want to modify the code, use this for day-to-day contributor flow: build, run, test, and iterate locally. Development workflow instructions are in development_workflow.md.

Repository structure

If you want a quick map of the top-level folders and what each one is for, see repository_structure.md.