Sierra, the company that builds AI agents for customer service, has acquired Anon, a start-up that makes it possible for AI agents to use websites the way a person would: logging in, moving between pages and filling in forms, even when the site offers no API for software to connect to. The deal was announced on 5 November 2026 in a post on Sierra's blog by Anon's Daniel Mason. No price was disclosed.
The deal
The Anon team is joining Sierra and bringing its technology with it. The announcement says Anon's know-how will now go into agents that already handle billions of customer conversations a year. The post names three members of the Anon team: Richárd Hruby, Hardik Patil and Daniel Mason.
Mason writes that he first met Clay at Sierra through an investor they had in common, and that the two companies were already working on related problems for many of the same customers.
What the company does
Anon started in early 2023 as an AI personal assistant. According to Mason, that product showed the team that a bigger opening lay in building the plumbing other AI agents would need, which the team thought of as a Plaid for AI agents.
Much of what people do online happens behind a login and in screens designed for humans rather than programs. To let agents work there, Anon built:
- sign-in and password handling, including multi-factor authentication;
- browser infrastructure for running agents on websites;
- an agent harness, the software that keeps an agent on task;
- an SDK that developers could build into their own products.
Anon raised more than $13 million and says hundreds of customers used its product, from AI start-ups to listed companies. Over the past year it also built and ran agents for large customers in banking, healthcare and business software, some of whom are Sierra customers too. By its own count it has completed hundreds of thousands of complex tasks in live use, with agents able to run for hours on a single job.
"Reliability is the hardest problem in browser use, so this became our central focus."Daniel Mason, Anon
Timing and conditions
The post presents the deal as done, with the Anon team already joining Sierra. It gives no price, no closing conditions and no word on what happens to Anon's existing product or customers.
How it fits
Sierra's newer Horizon agents work on goals that can take days or weeks, such as originating a loan or getting prior approval for a medical procedure. Those jobs often cross several systems, and some of them, Mason notes, have no API. Anon's technology is meant to cover those steps: when an agent has to sign in to a website, find its way through a portal or type information into a browser, it should be able to finish the job rather than stop.
Background
Sierra said on 30 October that it had passed $400 million in annual recurring revenue, adding more than $150 million in the third quarter alone. In May it said it was raising $950 million at a valuation of more than $15 billion. It is one of several AI agent deals this week; Meta is taking on the team behind Conductor, and Salesforce is buying Cresta.
Announced by Sierra on its official blog: read the announcement
