Sequoia, Benchmark and Coatue wired $1 billion into Instinct on Sept. 28. The Series C set its valuation at $10 billion1. Thirty-three days earlier, the same company had closed a $250 million round worth a quarter of that figure13. Noah Shinn built Instinct to text, call and pay on a user's behalf. Investors just valued his four-month-old company the way they would value software already running on every phone. A month before the check cleared, users were reporting that the same agent could invent details belonging to someone else's account. At the same time, a named venture capitalist was warning in public that its terms of service would reset what consumers accept as normal24. The money arrived before either problem found an answer.
Shinn bets one agent can replace a phone full of apps
Noah Shinn left Northeastern University in 2023. He had coauthored "Reflexion: Language Agents With Verbal Reinforcement Learning" with MIT professor Ashwin Gopinath. Shinn presented it at NeurIPS that year, and Google DeepMind has cited the paper hundreds of times since5. Sierra hired Shinn as one of its first employees. Salesforce co-chief executive Bret Taylor had founded that company to sell enterprise AI1. Shinn founded Instinct in 2025. He opened a private beta in February 2026, then moved to an invite-only release the next month5. The agent texts and calls on a user's behalf. It plans trips, buys groceries and cancels subscriptions. "They've told us they've planned cross-country road trips, bought weekly groceries and concert tickets, and cancelled hundreds of dollars of subscriptions," Shinn told PYMNTS, describing what early users report back6. Growth arrived on word of mouth alone, ahead of any advertising budget. "We spent $0 on marketing so far," Shinn told Fortune. Demand ran high enough that invitations reportedly resold on eBay5. Instinct is now approaching $1 billion in annual transaction volume, Shinn told Fortune. Travel makes up about half of it5. When the Series C closed, Shinn described the ambition behind all of it. "We're building Instinct to be the best personal agent that can handle the deeply personal nuances of everyday life," Shinn said1.
Chart 1
Instinct's valuation jumps from $2.5 billion to $10 billion in 33 days
Instinct's funding valuation, billions of dollars, Series B against Series C
Each column is one funding round: the blue column is the Series B valuation set on Aug. 26, and the magenta column is the Series C valuation set on Sept. 28.
Sources: TechCrunch [1]; TechCrunch [3]. Chart by The AILately.com Desk.
The numbers behind this chart
| Item | Value |
|---|---|
| Series B, Aug. 26 | $2.5B |
| Series C, Sept. 28 | $10B |
A crowded field chases the same convenience
Instinct competes with Meta's Muse, a rival personal assistant already downloaded millions of times7. At least a dozen smaller AI-agent products chase the same pitch, including rivals named Wajo, Ollie and Poke7. Instinct's valuation outruns every one of them, and the public warning about its terms of service stays attached to Instinct alone. The gap says something about what investors are pricing right now. They are paying for a head start on convenience, well ahead of paying for a settled answer on safety.
A license broad enough to alarm investors' own peers
Instinct's terms of service grant the company a license. Its own August coverage called that license perpetual and irrevocable. It covers the right to access, store and train its models on material a user sends through the app2. The same terms let Instinct read a device's screen captures, cursor movements and keystrokes. They also let the agent enter agreements that bind the user on the other end2. Michael Mignano, a general partner at Union Square Ventures who founded the podcasting company Anchor before Spotify bought it, read the structure as a shift in what people will accept. He warned that "people will increasingly hand over passwords to 3p [third-party] apps, unaware of how or what they are storing for them"2. Alex Cohen, cofounder of the health care company Hello Patient, tested the access directly. He reached a plainer verdict. "For additional context, I don't think we're at the point where it's safe to give AI read/write access to your inbox," Cohen said2. Katie Jacobs Stanton, founder of the venture firm Moxxie Ventures, named the exchange users make ahead of ever reading the fine print. "We're trading privacy and control for hyper-personalized AI tools, often without fully understanding the trade," Stanton said2. Early testers found the terms matched the warnings. Peter Yang reported that Instinct kept his Gmail records after he asked for deletion. The company fixed the gap only once he complained in public2. Claire Vo disconnected the agent from her Google account. She still received an email summary hours later, stored in plain text2.
A hallucination Shinn calls routine
September brought a different complaint. The agent appeared to produce details belonging to someone else's account. That raised a sharper question than a broad license: had Instinct crossed into an actual leak4? Shinn answered directly. "This was not a data breach, no user data was shared, and no user isolation boundary was violated," Shinn said. He attributed the episode to a hallucination, the agent inventing a plausible detail rather than retrieving a real one4. The distinction carries weight only if a user can check it from the outside. Instinct's own terms give that user little room to look. An agent already holding a license to store and train on everything it touches is asking to be trusted on the exact question its critics raised a month earlier. Can anyone beyond the company verify what it does with what it holds?
What each side would need to be true
Shinn's case rests on a plain distinction between a leak and a mistake. Three rounds of investors have already priced that mistake as tolerable at this stage of the product. For that case to hold, Instinct needs its hallucinations to stay cosmetic. Each one has to invent a detail, rather than actually mix one account's data into another, even when the error looks that way from outside. Stanton's case rests on the opposite wager. A license this broad, paired with an agent that already misfires in public, costs more trust than a funding round can buy back. For her case to hold, one confirmed cross-account leak, rather than a hallucination Instinct can explain away, settles the argument. That reckoning would arrive before Instinct ever publishes a user count or a security audit of its own. Each side is working from a partial record so far. Shinn controls the company's own account of each incident, and Stanton is reading the same incidents from outside the company's walls.
By the numbers
- $10 billion: Instinct's valuation after its Sept. 28 Series C, led by Sequoia, Benchmark and Coatue1.
- Thirty-three days: the gap between that round and an August Series B that valued Instinct at $2.5 billion and had already drawn public privacy warnings23.
- $350 million: Instinct's total funding after that August round, against $1 billion raised in the Series C alone3.
- $1.35 billion: Instinct's total funding since 2025, once the new round is added in13.
- Twenty-three: Shinn's age when his company crossed a $10 billion valuation5.
- $1 billion: the annual transaction volume Instinct told Fortune it is approaching, about half of it travel bookings5.
- $0: what Shinn says Instinct has spent on marketing its growth5.
- Six: named critics TechCrunch quoted raising data and security concerns about Instinct in one August article2.
- Four months: the age of Instinct's product when its valuation reached ten figures15.
Chart 2
Instinct's Series C alone makes up 74 percent of the $1.35 billion it has ever raised
Total funding raised since 2025, billions of dollars, by round
Sources: TechCrunch [1]; TechCrunch [3]. Chart by The AILately.com Desk.
The numbers behind this chart
| Item | Value |
|---|---|
| Series C alone | $1B |
| Whole | $1.35B |
What to watch
Watch whether Instinct publishes a security audit or a verified user count to match the scrutiny its valuation now draws; both have gone missing across three funding rounds so far. A repeat of September's hallucination would test how long Shinn's denial keeps satisfying his critics, while one confirmed cross-account leak would settle the question Stanton is already asking. Florida's parallel motion to freeze another company's model training shows regulators are already willing to act on AI terms of service before a court case fully resolves, and Instinct's own terms have drawn exactly the kind of public warning that tends to invite the first inquiry.
Sources
- Sarah Perez, "Viral AI agent Instinct raises $1B Series C at a $10B valuation," TechCrunch, Sept. 28, 2026, https://techcrunch.com/2026/09/28/viral-ai-agent-instinct-raises-1b-series-c-at-a-10b-valuation/
- Sarah Perez, "Instinct's powerful AI assistant is raising privacy and security concerns," TechCrunch, Aug. 24, 2026, https://techcrunch.com/2026/08/24/instincts-powerful-ai-assistant-is-raising-privacy-and-security-concerns/
- Lucas Ropek, "Viral AI startup Instinct has raised $350 million at a $2.5 billion valuation," TechCrunch, Aug. 26, 2026, https://techcrunch.com/2026/08/26/viral-ai-startup-instinct-has-raised-350-million-at-a-2-5-billion-valuation/
- Matthew Loh, "Instinct's founder says the viral AI agent's hallucinations can spit out what looks like a stranger's data," Business Insider, Sept. 24, 2026, https://tech.yahoo.com/ai/deals/articles/instincts-founder-says-viral-ai-063054528.html
- Marco Quiroz-Gutierrez, "Meet Noah Shinn: The 23-year-old college dropout whose viral AI assistant is emerging as a new challenger to Mark Zuckerberg's Meta," Fortune, Sept. 30, 2026, https://finance.yahoo.com/technology/ai/articles/meet-noah-shinn-23-old-070400675.html
- PYMNTS, "Instinct Nears $2.5 Billion Valuation as AI Assistants Take Over Daily Chores," PYMNTS, Aug. 26, 2026, https://www.pymnts.com/news/artificial-intelligence/2026/instinct-nears-2-5-billion-valuation-as-ai-assistants-take-over-daily-chores/
- Kyt Dotson, "Everyday personal AI assistant startup Instinct raises $1B at $10B valuation," SiliconANGLE, Sept. 28, 2026, https://siliconangle.com/2026/09/28/everyday-personal-ai-assistant-startup-instinct-raises-1b-at-10b-valuation/