Instinct is a personal AI assistant with no app to learn. You text it or call it, the way you’d reach a human assistant, and it goes and does the thing. Ask it to grab a dinner reservation or fight a bill, and it handles it.
It’s also a live test of a question worth thinking about before tools like this reach you. How much of your life are you willing to hand an AI so it can act for you?
What it means
Instinct is a personal AI agent (software that takes actions for you, not just answers). It connects to your email, messages, and calendar, and can also see your phone’s screen, audio, and location. It’s built by a small San Francisco startup called Spear Street Technology, led by Noah Shinn, a former research scientist at the AI company Sierra. It’s free during the invite-only beta, and the company hasn’t announced pricing.
Why it matters
It went from stealth to huge in about a month. In late August 2026, Instinct told The Wall Street Journal it raised a $250 million Series B at a $2.5 billion valuation. By mid-September, The Information reported it was in talks at $10 billion, with over 100,000 users. (It’s still invite-only.)
Early testers found real problems. One user disconnected her email and got a summary of her inbox three hours later, because Instinct had kept a copy. Moxxie Ventures founder Katie Jacobs Stanton said it sent an email for her without checking first, so she disconnected it. Another tester showed it could be tricked by instructions hidden in an email. The team has since added a way to delete stored data.
The terms are broad. Instinct’s terms of service give it a “perpetual and irrevocable” license to your materials, including to train its AI, and let it make binding agreements on your behalf. Most people won’t read that far. Some testers did, and posted screenshots.
Simple example
You hire a personal assistant who’s fast, sharp, and works all night. On day one they ask for your email password, your calendar, and a signed note saying anything they agree to for you counts. By Friday they’ve rebooked your flight and knocked a little off your phone bill. You’re thrilled.
Then you find out they’ve been making photocopies of all your mail and keeping them in a filing cabinet at their place. Maybe that’s just the price of an assistant this good. I dunno. You’d still want to know before you handed over the keys.