Several high profile AI agents have failed, shut down, or been absorbed by larger companies. The clearest recent cases are Relay, which shut down in August 2026, Google’s Project Mariner, which closed in May 2026, and the Humane AI Pin, which ended in February 2025. This page tracks them in one place, with what happened and why. We update it as new cases appear.
Most agent failures fall into three buckets. Some shut down outright. Some were quietly absorbed by a bigger company in a reverse acqui-hire. And some pivoted away from the original promise after a weak launch. This tracker sits alongside our AI agent acquisitions tracker and AI agent unicorns list.
Which AI agent startups have shut down?
These are the most notable AI agents that have failed, shut down, or been absorbed. Status shows what happened to each.
| Company / Product | What it did | What happened | Date | Status |
|---|---|---|---|---|
| Relay | AI workflow automation, an agent based Zapier rival | Shut down entirely | Aug 2026 | Shut down |
| Project Mariner (Google) | Browser agent that used the web like a human | Closed, tech folded into Gemini | May 2026 | Shut down |
| Humane AI Pin | Wearable AI agent device | Ended, assets sold to HP for $116M | Feb 2025 | Shut down |
| Character.ai | Companion chatbot platform | Filed for bankruptcy | Oct 2026 | Bankruptcy |
| Operator (OpenAI) | Web browsing agent that did tasks | Folded into ChatGPT | 2026 | Absorbed |
| Adept AI | Enterprise action and agent models | Team and tech taken by Amazon | 2024 | Acqui-hire |
| Inflection AI (Pi) | Personal assistant agent | Founders and staff moved to Microsoft | Mar 2024 | Acqui-hire |
| Rabbit R1 | AI companion device | Repositioned after a weak launch | 2024 | Pivoted |
Why do AI agents fail?
AI agents fail for four main reasons. The first is competition from big platforms. When OpenAI and Google build the same feature into ChatGPT or Gemini, a standalone agent loses its reason to exist. That is what killed Relay. The second is reliability. Early agents like the Humane Pin and the first Rabbit R1 did not work well enough, so users left. The third is cost. Running agents at scale is expensive, and some companies could not cover it. The fourth is trust and regulation, which is what pushed Character.ai into bankruptcy.
Have any well-funded AI agents been shut down?
Yes. Several agents that raised large sums still failed. Humane raised about $230 million before its AI Pin was shut down and sold for a fraction of that. Adept raised about $415 million before Amazon took its team. Inflection raised roughly $1.5 billion before most of its staff moved to Microsoft. Big funding did not save any of them, which is the clearest sign that money is not the bottleneck in this market. Reliability and distribution are.
What is the most common way AI agents die?
The most common way an AI agent dies is not a public shutdown. It is a reverse acqui-hire. A large company hires the founders and key staff, licenses the technology, and leaves the original company as a shell. Adept and Inflection both went this way. The product fades out while the talent moves inside Amazon, Microsoft, or Google. It looks like a soft landing, but the independent agent is gone.
Did any AI agent fail because it simply did not work?
Yes. Some agents failed on performance, not strategy. The Humane AI Pin shipped with slow responses and a charging case that could overheat. The first Rabbit R1 was widely called unfinished, with unreliable task handling. Google’s Project Mariner worked as a demo but never became dependable enough for daily use, and Google shut it down and moved the technology into Gemini. These cases show how high the reliability bar is for agents that act on a user’s behalf.
How we track this list
We include an AI agent when it has publicly shut down, filed for bankruptcy, been absorbed through an acqui-hire, or pivoted away from its original agent product. Each entry is based on reporting or a company announcement. We mark the status so readers can tell a true shutdown from an absorption or a pivot. We review the list monthly and add new cases as they are confirmed.
Frequently asked questions
Notable AI agents that have shut down include Relay in August 2026, Google’s Project Mariner in May 2026, and the Humane AI Pin in February 2025. Character.ai filed for bankruptcy in October 2026.
AI agents fail mainly because big platforms build the same feature into their own apps, because early agents are not reliable enough, because running them is expensive, and because of trust and regulation issues. Money is rarely the main reason.
Yes. Humane raised about $230 million, Adept about $415 million, and Inflection roughly $1.5 billion, and all three failed as independent agent companies despite the funding.
A reverse acqui-hire is when a large company hires a startup’s founders and key staff and licenses its technology, without a full acquisition. The startup is left as a shell and the product usually fades. Adept and Inflection are leading examples.
Humane shut down the AI Pin in February 2025. HP bought most of its assets for about $116 million, and existing devices stopped working. Performance problems and a battery warning were among the issues.