Sabi raises $50M to build a wearable brain-computer interface that converts thoughts into prompts

Sabi, a Palo Alto startup, has raised $50 million to build a wearable brain-computer interface that converts thoughts into prompts. The device is a beanie, not a brain implant. The round was announced on October 9, 2026. Its pitch is simple: if you want to talk to AI with your mind, you shouldn’t need a neurosurgeon to make it happen. A hat with a lot going on underneath Sabi’s flagship product is a beanie embedded with dense arrays of miniature EEG sensors. EEG, or electroencephalography, reads the brain’s electrical activity from outside the skull, so nothing gets implanted. Sabi says the beanie packs between 70,000 and 100,000 miniature sensors, each about 1 mm in size. The goal is to decode internal thoughts into digital text or commands. Sabi’s estimated decoding speed is around 30 words per minute. A baseball cap variant is also in the pipeline, pitched as a more discreet option. Who is writing the checks The $50 million round drew a recognizable lineup. Investors include Khosla Ventures, Accel, Initialized Capital and DST Global. Kevin Weil, a former chief product officer at OpenAI, also participated. Sabi plans to use the capital in two areas. The first is improving its har...