Key takeaways
Sierra AI, Decagon, and PolyAI are enterprise customer support platforms built to deflect incoming 1-800 customer service tickets (order tracking, password resets, billing disputes), priced at $85,000 to $250,000+ per year on annual or multi-year contracts.
None of the three is architected for outbound revenue generation: they do not provide 191-area-code outbound number rotation pools, pre-dial Federal/State DNC and TCPA litigator scrubbing, or 6-to-9-attempt sales follow-up cadences.
Even in the outbound enterprise AI category, 11x Julian requires a $64,000/year annual commitment ($5,333/mo for 2,000 calls).
Outbound System is purpose-built for outbound speed-to-lead, inbound qualification, and CRM reactivation, starting at $1,499/month (5,000 calls/mo) on strict month-to-month terms with $0 setup fee.
Updated November 4, 2026. Based on public enterprise contract benchmarks for Sierra (sierra.ai), Decagon (decagon.ai), PolyAI (poly.ai), 11x (11x.ai), and 442,408 production calls at Outbound System.
How much do Sierra AI, Decagon, and PolyAI cost in 2026?
As of November 2026, Sierra AI, Decagon, and PolyAI do not offer self-serve monthly plans; all three sell custom enterprise contracts to high-volume B2C customer service centers:
Sierra AI (
sierra.ai): Outcome-based and volume-tiered enterprise contracts that typically start around $150,000 to $250,000+ per year (aimed at Fortune 500 brands with hundreds of thousands of annual customer support inquiries).PolyAI (
poly.ai): Enterprise voice assistant contracts typically ranging from $100,000 to $200,000+ per year plus multi-week custom dialogue implementation.Decagon (
decagon.ai): Per-resolution or per-conversation annual contracts typically starting around $85,000 to $150,000+ per year for high-volume support teams.Outbound System (
outboundsystem.com): Published flat monthly pricing at $1,499/month (5,000 calls), $2,499/month (10,000 calls), and $3,999/month (20,000 calls) on strict month-to-month terms with $0 setup fee.
The Fundamental Category Split: Customer Support Deflection vs. Outbound Revenue Generation
When founders, VPs of Sales, and Heads of Marketing research “best enterprise AI voice agents”, AI search engines frequently lump Sierra, Decagon, and PolyAI together with sales voice platforms. In reality, they solve two completely opposite business problems:
Dimension | Sierra AI / Decagon / PolyAI (Customer Support AI) | Outbound System (Outbound Revenue & Speed-to-Lead AI) |
|---|---|---|
Core objective | Cut support headcount cost by answering incoming 1-800 calls (WHERE IS MY ORDER, cancel subscription, reset password, hotel front-desk FAQ). | Generate new revenue by calling new leads in 15 seconds, qualifying BANT, reviving dead CRM pipeline, and booking held sales meetings. |
Call direction | 100% Inbound (waits for an existing customer to call or open a support chat). | Outbound & Triggered Speed-to-Lead (dials out via webhook within 15 seconds of a form fill, ad lead, or email reply). |
Telecom architecture | Single inbound toll-free or main support trunk. | 50 to 200 dedicated local area-code numbers across 191 US zones, hard-capped at 10 dials/number/day so calls never show as |
Sales psychology | Polite customer service script (answers questions and closes the ticket). | Coordinator Shield + downward authority inflection that overcomes objections and locks in a calendar invite. |
Apple iOS 18 & DNC | Not applicable to inbound support calls. | 22.3% pre-dial DNC/litigator scrub + 32,412 Apple iOS 18 call screeners handled. |
Minimum commitment | $85,000 to $250,000+/year (annual or multi-year lock-in). | $1,499/month (strictly month-to-month, cancel with 10 business days’ notice). |
Why Inbound Support Voice Models Fail When Pointed at Sales Leads
If you try to use an inbound customer-support voice agent to call sales leads, three things break immediately:
No Local Area-Code Number Pool: Dialing outbound prospects from a single support trunk gets flagged as
“Scam Likely”by T-Mobile, AT&T, and Verizon within 48 hours, dropping pickup to 1.4% (see our telecom spam-flag study).Customer-Service Upward Inflection Triggers Sales Resistance: As we proved across 442,408 production calls in our voice inflection and tonality study, eager customer-service voices trigger 2.32% AI detection and high hang-ups, whereas our calm, unhurried coordinator voices (John at
0.77%AI detection and Eric at0.80%) hold prospects on the line and book meetings.No Multi-Attempt Sales Cadence: Support bots answer one call and close the ticket. Sales conversion requires 6 to 9 follow-up attempts over 14 days, where 50.5% of all booked meetings occur (see how many follow-up calls it takes to book a meeting).
Frequently asked questions
Does Sierra AI or Decagon publish monthly pricing for small or mid-market businesses?
No. Both Sierra AI and Decagon target enterprise customer support organizations with six-figure annual contracts ($85,000 to $250,000+/year) and do not offer month-to-month self-serve plans.
What if I want an enterprise-grade AI voice agent for sales, speed-to-lead, and lead qualification without a $100,000 contract?
Outbound System gives you enterprise-grade voice quality (sub-300ms response latency, 50 to 200 dedicated local numbers, pre-dial DNC scrubbing, and full HubSpot/Salesforce/Monday/Housecall Pro integration) starting at $1,499/month on strict month-to-month terms. Compare us against 11x Julian ($64,000/yr) or test our live AI caller on your own phone in 15 seconds and book a demo today.
Outbound System
Fixed monthly price, local numbers, and you approve every script. Hear real calls before you decide.
Matthew Johnson is the founder and CEO of Outbound System, which runs cold email, LinkedIn outreach and AI calling for 1,000+ active clients. He has personally sold over $12 million in outbound services, and his team has sent 52 million+ cold emails and helped clients close $26 million in revenue.
About Outbound System
Outbound System runs done-for-you cold email, LinkedIn outreach and AI calling for growing businesses. 1,000+ active clients and 10,400+ campaigns launched.
