Sierra

Sierra helps businesses build better, more human customer experiences with AI.

9.7Score#3 of 999 agents#1 of 35 in Customer support agent

Why it ranks #3

Sierra, an AI customer support agent, ranks #3 of 999 AI agents and #1 of 35 in Customer support agent, with a score of 9.7 of 10. Data as of 3 Oct 2026.

The score adds four parts, each 0 to 10, by weight. Every point comes from public evidence. How scoring works ·

Proof 10 × 30% 3.0
Scale 10 × 30% 3.0
Momentum 10 × 25% 2.5
Autonomy 8 × 15% 1.2
= 9.7

Proof
Do customers use it? 30% of the score
10
Claims revenue or growth, named customers, a customer result, a customer count and work done at scale.
- +4
  Revenue or growth
  “After reaching $100M in ARR in seven quarters, we followed with our first-ever $50M quarter — kicking off our third year with over $150M in ARR.”
  Source · 6 Feb 2026
- +3
  Named customers
  “Read how businesses like WeightWatchers, Sonos and Sirius XM excel using Sierra's conversational AI for enhanced customer service.”
  Source
- +2
  A customer result
  “For one agent, pairing a natural voice with a persona increased resolution rates by almost 50 percent.”
  Source · 7 Aug 2026
- +2
  A customer count
  “Almost 50% of the Fortune 50 work with Sierra, as well as 1 in 3 of the leading banks, and 5 out of 10 of the largest healthcare companies in the world.”
  Source
- +2
  Work done at scale
  “Now, our customers have built agents that are handling billions of customer interactions and driving billions of dollars of revenue every year.”
  Source · 7 Aug 2026
Scale
Is there a real company behind it? 30% of the score
10
549 people, raised $950M.
- +7
  549 people100 or more people
- +3
  Raised $950M (Series E)Sierra raises $950M as the race to own enterprise AI gets seriousSource · 4 May 2026
Momentum
Is it shipping and growing now? 25% of the score
10
Shows a recent launch, hiring, a new claim and funding news.
- +3
  Release post in the last 6 monthsGhostwriter: When AI goes from tool to teammateSource · 28 Sep 2026
- +3
  Hiring: 197 open rolesEnterprise Sales Engineer, High Growth Enterprise Account Executive, Enterprise Sales Director - MajorsSource
- +2
  A new traction claim
  “Now, our customers have built agents that are handling billions of customer interactions and driving billions of dollars of revenue every year.”
  Source · 7 Aug 2026
- +2
  Funding news in the last yearSierra raises $950M as the race to own enterprise AI gets seriousSource · 4 May 2026
Not found: founded in the last year (it was founded in 2023) (+1)
Autonomy
How much of the job does it do on its own? 15% of the score
8
Autonomous worker: completes whole tasks; people handle exceptions.
- +8
  Level 3 of 4: Autonomous workerCompletes whole tasks; people handle exceptions.
How the level was set
- Level 3 (autonomous worker) from a reviewed decision that cites the product's own pages
Level 3: Completes whole tasks; people handle exceptions.

About Sierra

Sierra helps businesses build better, more human customer experiences with AI. By partnering with industry leaders, we’re transforming customer experiences, pushing the boundaries of applied AI, and delivering measurable business impact at scale.