What it is
Sierra is an autonomous AI support agent. It handles a customer's whole request, not only the reply to a question.
What you'd use it for
You would use Sierra to let AI carry out support tasks end to end: a return, a subscription change, an account update, across chat, voice, email, and SMS. It also has set workflows for specific industries, such as insurance claims and mortgage servicing.
Examples of use
A customer messages about a charge they think is wrong. The AI agent looks into the billing dispute, works out the correction, and applies the refund in the same conversation, whether they came in by chat or by voice.
A shopper wants to send back something that did not fit. The agent processes the return and updates the order status in the company's own systems, so the whole task is done end to end.
A subscriber asks to pause their plan for a couple of months. The agent handles the subscription change for them, the same way it would a downgrade, without the request reaching a person.
A caller has just had a car accident and rings to report it. The agent takes the first notice of loss and opens the insurance claim, following the workflow set up for that industry.
A case turns out to be more tangled than the agent can settle. It escalates to a human agent and attaches the full conversation and context, so the person picks up where it left off.
Someone needs help late in the evening, long after the team has gone home. The agent answers across chat, voice, email, or SMS, so the customer is not left waiting until morning.
How it works
Sierra runs several AI models together, with supervising agents that hold them to your policy. You set the agent up through a no-code builder, and developers can extend it with a code kit.
How it compares
Sierra is one of the close rivals in this group, alongside Decagon and Ada. All three resolve tickets end to end. Sierra's pitch is the no-code builder and its model orchestration, where Decagon leans on plain-language operating procedures and Lorikeet breaks complex cases into strict steps.
What others say
No major analyst, Gartner or Forrester, has formally rated Sierra. The outside signal is press coverage and customer results the company reports itself.