Initialized Capital, Collaborative Fund and Ascend also invested. The San Francisco company is run by CEO Rahul Chhabra and CTO Atmadeep Banerjee. It hides millimeter-scale sensors in a baseball cap that read brain signals through hair, with no gel needed. Sabi says its custom EEG chip uses less than one fiftieth the power of a widely used Texas Instruments part. Its brain foundation model was trained on more than 100,000 hours of labeled recordings. The company is working on three features: imagined speech to text, trained mental commands that become AI prompts, and prediction of a user's next on-screen action. Neural data is encrypted at the sensor. A prototype is due at CES 2027. Banerjee co-authored MindEye, a NeurIPS 2023 paper on decoding images from non-invasive scans. For founders, a $50M seed for non-invasive neural input shows investors betting the next interface fight is about how fast people can give AI instructions. Agent builders should watch whether thought-to-prompt becomes a usable input.