Arm adds Cortex-M42 to bring AI processing to small, cost-sensitive devices

Arm is giving chip designers another way to add AI processing to devices with little room or budget for more computing. On November 10, 2026, it introduced Cortex-M42 and added the processor to Arm Flexible Access and Arm Total Access, targeting applications such as wearables, connected sensors and industrial controllers.

An upgrade path for compact controllers

Cortex-M42 combines Arm’s Helium technology with a compact design based on AHB, a hardware interface. Arm says that combination makes it easier for silicon partners to upgrade microcontrollers based on Cortex-M4 and Cortex-M33 while adding more advanced machine learning and digital signal processing—the work of processing inputs such as audio and sensor signals.

The processor uses the Armv8.1-M architecture and supports Arm Custom Instructions. Those instructions give partners another way to optimize the processor for particular workloads.

Arm compares the new processor with Cortex-M33 on two measures: vector compute capability and vector power efficiency. The figures below are company claims about those measures, not a promise that an entire device will run three times faster or last twice as long on a battery.

Listening, sensing and spotting wear

Arm positions Cortex-M42 for applications where both cost and the space occupied by the processor matter. Its examples focus on interpreting signals close to the device collecting them, rather than assigning the processor every part of a machine’s operation.

• Wearables: Arm identifies audio processing and keyword spotting as intended uses.
• Industrial and connectivity controllers: Target workloads include sensor analysis, condition monitoring and signal processing. Arm also links these capabilities to anomaly detection and predictive maintenance in machines with distributed embedded processing.

Robotics provides a useful boundary for that pitch. Arm says Cortex-M42 could process signals locally and monitor the condition of motors and joints, helping identify unusual behavior or equipment wear. It explicitly separates that example from safety-critical motion control: the processor would monitor the machinery, not perform those safety-critical movement functions.

Two routes into chip development

Arm Flexible Access offers low- or no-cost access to a portfolio of processor designs, development tools and technical resources.

Arm Total Access serves established semiconductor companies, equipment manufacturers, design manufacturers and system integrators as they develop, commercialize and scale products.

Arm reported 319 active Flexible Access members and more than 500 unique tape-outs as of November 2026. Total Access had 60 partners and had supported more than 600 projects since launch.