The San Francisco company behind a text-based personal assistant quadrupled its valuation in a matter of weeks

Instinct, a San Francisco startup building AI agents that run your errands over text message, has raised $1 billion in a Series C round. The deal, completed on September 28, 2026, gives the company a post-money valuation of $10 billion.

Just weeks before this raise, Instinct’s previous funding round valued it at $2.5 billion. A fourfold jump in valuation over a few weeks is the kind of trajectory most startups only see in pitch decks.

Sequoia Capital, Benchmark Capital and Coatue led the Series C. That is a heavyweight lineup for a company that opened its consumer product to the public only recently, and only by invitation.

Instinct launched one year before this funding announcement. The company rolled out an invite-only consumer service in August 2026. In other words, the $10 billion valuation arrived roughly a month after regular people could start trying the product, and only the ones who got an invite.

The $1 billion raised represents a tenth of the post-money valuation, which means investors bought into the company at a $9 billion pre-money price. The company’s implied worth climbed by several billion dollars between two funding rounds separated by weeks, not years.

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Instinct builds AI agents for personal assistance. The product works through SMS and text messages. Users send requests the way they would text a friend, and the agent handles the task on its own.

Instinct focuses on things like making bookings and placing phone calls autonomously. An autonomous agent is software that carries out multi-step jobs without a human approving each step, rather than simply answering questions like a chatbot.

Founder Noah Shinn has framed the company’s mission around scale. He said the goal is for Instinct to become “the best personal agent” for its users.

The invite-only rollout gives the company some room to test and refine before opening the doors wider. A $1 billion war chest buys a lot of engineering, infrastructure and runway to get the product right at larger scale.

At $10 billion, Instinct needs to grow into a business that justifies a price set before most of its potential users have tried it. A fourfold markup in weeks compresses the timeline for proving the thesis.