Before driving
- The device identifies the expected car and software.
- The mount is secure, centered, and does not block either camera.
- You understand that openpilot is driver assistance and you must stay ready to take control.
Install guideStock openpilot
How to install stock openpilot
Check your car first, install the hardware, then use the current release installer while parked.
comma four or comma 3X
Release installer
Enter this on the comma device's Custom Software screen, not in a desktop or phone browser.
Stock openpilot release installer
openpilot.comma.aiCopy the entire value exactly as shown.Chestnut · comma four
Stable Chestnut release
For comma four connected to Chestnut. Use the dedicated installer below.
Stable Chestnut installer
For Chestnut-equipped devices installer.comma.ai/commaai/release-chestnutEnter this on the comma four Custom Software screen.Parked setup
Four simple steps
Check your exact car
Match the year, trim, driver-assistance package, and required harness before installing anything.
Install the hardware
Keep the car parked and follow comma's official setup guide for the mount, harness, and device connections.
Enter the release installer
On the comma software setup screen, choose Custom Software and enter the release value shown above.
Finish setup before driving
Let installation complete, follow every on-screen prompt, and finish the required calibration flow.
Switching software?
Follow the current uninstall path first, then return to the normal setup screen.
Open uninstall guideQuick answers
openpilot installation questions
What is the openpilot install URL?
comma 4: openpilot.comma.ai; comma 3X: openpilot.comma.ai; comma 4: installer.comma.ai/commaai/release-chestnut
How do I install openpilot?
Park the car and connect the comma device to Wi-Fi. Remove the current software. Choose Custom Software and enter the openpilot URL shown here. Finish every on-screen step before you drive.
Will openpilot work with my car?
openpilot device support does not prove support for a specific car. Check the exact year, trim, driver-assistance package, and harness before installing.
Need help first?
Device support alone does not cover every year, trim, package, or harness. Check your car, then compare the software choices.
$50 off comma four
You get $50 off; CommaGuide gets $50 after a qualifying purchase. Terms apply.
Official sources and advanced use
The openpilot project documents the release installer above and keeps separate staging and development tracks. Those faster-moving tracks are intentionally outside this simple owner guide.
Official references checked August 24, 2026.
Photos: comma.ai. CommaGuide is an independent guide and is not affiliated with comma.ai.
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