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Best AI Business Agents

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Sierra review

Sierra builds AI customer service agents for large consumer brands across chat and voice, priced on outcomes such as resolved conversations, saved cancellations or completed transactions.

Published · Updated . Facts checked November 12, 2026.

Fit by business size
  • Small business—
  • Mid-size company—
  • Enterprise8.1

Is Sierra worth it?

It depends on your size and the job. Sierra is worth it if you're a large consumer brand and want a premium customer experience agent priced on outcomes. Its best placement is #4 of 29 in our enterprise ranking. It's built for enterprises, not small businesses or mid-size companies. On the downside, enterprise-only. Consider Salesforce Agentforce instead if your company runs on Salesforce and wants governed agents across service, sales and operations. Price: custom pricing, as of November 2026.

Jobs it takes on5 of 10 fully
  • Answers customers: yesSupport
  • Finds and follows up with leads: partlySales
  • Writes and posts marketing: noMarketing
  • Handles email and calendar: partlyInbox
  • Takes and makes phone calls: yesPhone
  • Back office: reports, docs, data: partlyAdmin
  • Runs on a schedule or trigger: yesRuns alone
  • Asks before risky actions: yesApprovals
  • Connects to hundreds of apps: partlyApps
  • API or MCP access: yesAPI/MCP

Sierra screenshots

sierra.aiScreenshot of the Sierra homepage
Sierra homepage, captured November 12, 2026

Our verdict

Sierra is among the best AI agents for customer experience at large brands, with outcome-based pricing and strong voice. It's enterprise-only: no public pricing, no free trial, and reported contracts run well into six figures.

Choose Sierra if you're a large consumer brand and want a premium customer experience agent priced on outcomes.

Where it ranks

Where it's strong

  • Top-tier resolution quality
  • Pays on outcomes, not seats
  • Strong voice agents
  • Proven with very large brands

Where it falls short

  • Enterprise-only
  • No public pricing or trial
  • Needs a separate helpdesk
  • Six-figure contracts reported

How it scored

Base scores

Used in every size ranking, each with its own weights.

Does the work9.0
Reach7.0
Setup3.5
Control9.0
Value3.5
Trust8.5
Enterprise readiness9.0

Customer support: 7.6

Resolution quality9.5
Helpdesk depth6.5
Channels9.0
Pricing model5.0
Setup3.5
Trust8.5

Voice and phone: 7.2

Call quality9.0
Configurability7.0
Telephony8.0
Pricing5.0
Setup3.5
Trust8.5
Does the work:
Once set up, does the agent finish real jobs on its own, on a schedule or when something happens, or does it wait to be prompted?
Reach:
How many of a business's jobs and tools it can reach: customers, inbox, phone, sales, marketing, back office and other apps.
Setup:
Can a non-technical person get it working from a plain-English description, without building flows, hiring a developer or a services team?
Control:
Approvals before risky actions, logs of what it did, spending limits, and how reliably it does the job the same way twice.
Value:
What you pay for the work you get, counting usage charges, seats, onboarding fees and minimum contracts.
Trust:
Refunds, data handling, the company behind it, and what public reviews say.
Enterprise readiness:
SSO, role-based admin, audit logs, compliance certifications, data residency and procurement terms a large company expects.

Sierra pricing

PlanMonthlyBilled yearlyIncludes
Enterprisen/an/aPlatform fee plus per-outcome charges, negotiated

Prices as of November 2026, in US dollars before tax unless noted, from sierra.ai or the sources below, checked November 12, 2026. Prices change; check before you buy.

Sierra alternatives

  • Decagon Large companies automating high-volume support across chat, email and voice.Sierra vs Decagon
  • Kore.ai Enterprises automating contact-center and service conversations at scale.
  • Intercom Fin Businesses with real support volume that want resolutions, not just replies.
  • Zendesk AI agents Support teams that need a full helpdesk plus AI agents in one place.
  • Salesforce Agentforce Companies already on Salesforce that want agents across service, sales and operations.

See all Sierra alternatives

Sources