Sierra, the enterprise customer-service agent company founded by Bret Taylor, announced on October 30 that its annualized recurring revenue (ARR) has passed $400 million, including more than $150 million added in the third quarter alone.
In its official blog post, Sierra wrote that the ARR added in this one quarter exceeds the amount it added in all of last year. The company is just over two and a half years old.
Doubling times are getting shorter
Sierra gave two doubling periods: ARR went from $100 million to $200 million in six months, then from $200 million to $400 million in five months. The business doubled in size, and the doubling took a month less.
On the customer side, Sierra says it now works with nearly half of the Fortune 50. The blog cites one example: a U.S. retailer with annual revenue above $40 billion went from its first meeting to a live agent in just 27 days, using Sierra's Ghostwriter tool. The retailer has not been named.
"more ARR in one quarter than we generated all of last year"
(More ARR in a single quarter than we generated in all of last year.)
Sierra has always charged by outcome. The blog's wording is "You pay for outcomes, not tokens used": customers pay for problems that get resolved, not for model usage. That pricing ties revenue directly to the customer's business volume. The more inquiries a customer hands to an agent, the more Sierra earns.
Connecting the past year
In May, Sierra announced a $950 million funding round at a valuation above $15 billion. Working backward from the doubling times it has now given, ARR crossed $200 million at some point in the first half of this year; Sierra has not said which month.
Several milestones followed. Sierra and Meta led the launch of an open standard for personal AI agents called Poppy, and on October 9 announced 35 additional design partners. By Sierra's account, more than 50 companies now back Poppy, including Meta, Shopify, Stripe and Walmart. Before that, SoftBank also began selling Sierra's customer-service agents exclusively.
Put together, Sierra's growth this year runs along two lines. One is the faster rollout of large accounts such as Fortune 50 companies. The other is the use of an open standard and channel partners to bring agents into more settings. Sierra has not broken down which line drove most of the third-quarter gain.
The numbers still missing
Sierra is a private company, and what it released this time is only ARR and the increment. It did not disclose gross margin or customer retention, nor what share of total revenue comes from outcome-based contracts. ARR is an annualized figure based on current contracts, and it is not the same measure as recognized revenue.
The outcome-based model also raises a question outside observers care about: Sierra itself bears the cost of model calls, so the more customers it has, the higher its inference spend. There is no public data on how much of revenue that cost represents, and it will probably take its next funding round or a more formal financial disclosure to find out.
Sources: Sierra's official blog, checked for ARR, the third-quarter increase and the doubling periods; CocoLoop; Sierra's earlier funding and Poppy standard announcements.