October 10, 2026 — San Francisco, CA
Sabi, a San Francisco startup, has raised a $50 million seed round led by Khosla Ventures to build a brain-AI interface designed for everyday wear — beginning with a baseball cap that reads neural signals through your hair, with no gel, surgery, or contact with the scalp. Why it matters: if non-invasive imagined-speech decoding actually works at consumer scale, “thought to prompt” could become the next computing interface after the keyboard and the touchscreen.
What happened
Sabi announced the $50 million seed round on October 9. Joining Khosla Ventures are Accel, Initialized Capital, former OpenAI chief product officer Kevin Weil, DST Global, Collaborative Fund, and Ascend. The company’s first product looks like an ordinary baseball cap, with tiny EEG sensors — one to five millimeters — hidden inside, designed to translate imagined speech and intent into commands for AI.
How the cap is supposed to work
Most brain-computer interfaces have been built for clinical settings or cursor control, where surgery is acceptable. Sabi is betting on the opposite: a non-invasive path to everyday use. Each cap’s sensors are designed to capture neural signals through hair across a gap of up to five millimeters, built around a custom EEG chip the company says is more than 50 times as power-efficient as the widely used Texas Instruments ADS1299 in its internal benchmarks. That efficiency is what lets the electronics fit inside normal headwear.
The signals feed Sabi’s “Brain Foundation Model,” trained on more than 100,000 hours of labeled, non-invasive recordings from participants imagining words and performing mental tasks — which the company calls the largest disclosed dataset of its kind. Sabi describes three intended interactions: imagined speech to text (words you intentionally imagine appear on a connected screen), thought to prompt (a trained mental command becomes an instruction for an AI assistant), and intent prediction (the system anticipates likely keystrokes or on-screen actions for you to confirm). The cap connects wirelessly to a phone or computer, “much like a pair of earbuds,” and Sabi plans early demonstrations at CES 2027 in Las Vegas.
On privacy — the obvious question with a hat that reads your mind — Sabi says neural data is encrypted beginning at the sensor, inference runs on encrypted data so servers never receive unencrypted neural signals, and users will control when the cap records, which apps may receive commands, and which actions require confirmation.
The team has real pedigree: co-founder and CTO Atmadeep Banerjee is co-first author of MindEye, the 2023 NeurIPS paper that advanced decoding of viewed images from non-invasive brain recordings, and the staff includes hardware, machine-learning, and design leaders from Kernel, Apple, Microsoft, Meta, Adobe, and Nike alongside Stanford neuroscientists. As CEO Rahul Chhabra put it: “AI can write, reason and act, yet we still communicate with it by tapping on keyboards and screens.” Vinod Khosla added his own framing: “You cannot perform a billion brain surgeries to replace a billion keyboards.”
Why it matters
The honest read: this is a $50 million bet on an interface that doesn’t exist yet, from a company that hasn’t shown a working product publicly. Everything above is Sabi’s plan and its own internal benchmarks, not independent verification — and decoding imagined speech through a skull from a consumer hat is one of the hardest sensing problems in computing. But the investors lined up (Khosla, Accel, a former OpenAI CPO) and the technical team are serious, and the 100,000-hour dataset, if real, is a genuine moat. Watch the CES 2027 demo: either Sabi shows real-time imagined-speech decoding live on stage, or this stays a very expensive render. We’ll be watching.
FAQ
What is Sabi building?
A non-invasive brain-AI interface for everyday wear. The first device is a baseball cap with hidden EEG sensors that translate imagined speech and intent into AI commands.
Who funded Sabi?
A $50 million seed round led by Khosla Ventures, with Accel, Initialized Capital, Kevin Weil, DST Global, Collaborative Fund, and Ascend participating.
Does the Sabi cap require surgery or implants?
No. Sabi says its sensors read neural signals through hair with no gel, surgery, or direct contact with the scalp.
When can people try the Sabi cap?
Sabi plans to demonstrate early versions at CES 2027 in Las Vegas and says it is preparing units for an early-access waitlist. No consumer release date or price has been announced.
Sources: Sabi (GlobeNewswire press release)