comma 4
comma 4 is a driver-assistance (ADAS) device from comma.ai — an integrated onboard computer with a camera set, mounted behind the rear-view mirror. It runs the open-source openpilot software, providing lane centering and adaptive cruise control on compatible vehicles (350+ models across 27 brands). The device communicates with the vehicle over an OBD-C port (USB-C with CAN FD support).
comma 4 is the successor to the comma 3X. It features a Qualcomm Snapdragon 845 SoC, 128 GB of onboard storage, a 1.9" OLED display (300 PPI), and LTE, WiFi and high-precision GPS connectivity. The hardware ships without preinstalled software; openpilot requires no subscription. It is priced at 999 USD.
Classification
ADAS driving computer · serves as: Compute, Perception, AI Inference.
Which group comma 4 belongs to and how it is built
Compute Modules is a subcategory of hardware components that provide processing power for robotic systems. It encompasses onboard computers, single-board computers (SBCs), AI accelerators, embedded processors, GPU/NPU compute modules, and other units responsible for processing sensor data and executing control logic. These modules form the foundation of modern autonomous, humanoid, and perception-capable robots.
An integrated device combining a compute module (SoC), cameras and a display. It runs the software stack responsible for road perception and driver-assistance control (lane centering, adaptive cruise control), communicating with the vehicle over the CAN bus.
Technical specification
What comma 4 can detect and measure in its environment