Enterprise AI Customer Service in 2026: Decagon, Sierra, Ada, Forethought, Cognigy
These five vendors do not publish pricing. The data on this page is triangulated from Vendr SaaS marketplace, G2 buyer reports, public company announcements, and press coverage. It represents real signal -- not guesses -- but should be verified directly with the vendor before any procurement decision. Last verified April 2026.
Side-by-Side: Enterprise Vendor Comparison
| Vendor | ACV / Pricing Signal | Model | Deflection | Implementation | Source |
|---|---|---|---|---|---|
D Decagon | ~$400K median $50K floor | Per-conversation (enterprise quote) | 50-70%vendor-claimed | 8-16 weeks | Vendr |
Si Sierra | Custom outcome-based Enterprise-only | Outcome-based (pre-negotiated per resolution) | 60-80%vendor-claimed | 10-16 weeks | TechCrunch |
A Ada CX | ~$30K/year starting $1-$3.50/resolution at scale | Per-resolution (enterprise quote) | 40-60%vendor-claimed | 6-12 weeks | G2 |
Ft Forethought | ~$59,500 median $40K-$160K range | Platform + committed deflection volume | 40-60%vendor-claimed | 8-12 weeks | Vendr |
C Cognigy | Enterprise custom Large enterprise only | Enterprise custom pricing | 50-70%vendor-claimed | 12-20 weeks | Cognigy.com |
Pricing is triangulated from public sources. Vendor pricing changes -- verify with vendor before purchasing.
Decagon
Contact sales- Deep conversational AI and action execution
- Multi-helpdesk native integrations
- High accuracy on complex CX workflows
- $50K minimum engagement
- 8-16 week onboarding timeline
- No self-serve trial
Source: Vendr marketplace + G2 buyer reports. Last verified April 2026.
Sierra
Contact sales- Outcome-based pricing shifts resolution risk to vendor
- Strong regulated-industry track record (healthcare, fintech)
- Bret Taylor executive credibility ($100M ARR Nov 2025)
- No published pricing or floor
- Enterprise-only (budget $200K+ recommended)
- Longest implementation timeline in the category
Source: TechCrunch Nov 2025, Sierra.ai public statements. Last verified April 2026.
Ada CX
Contact sales- More pricing signal than pure enterprise vendors ($30K starting)
- Per-resolution model aligns incentives
- Strong multi-language support
- 3-7% annual contract escalation clauses
- Additional costs for languages and custom workflows
- Still requires quote -- no self-serve
Source: G2 pricing data and buyer reports. Last verified April 2026.
Forethought
Contact sales- Strongest multi-agent routing and triage capability in the category
- Good Zendesk and Salesforce integration depth
- Mid-market accessible price floor ($40K)
- Chat and email only -- no voice or WhatsApp native support
- Platform fee plus volume commitment makes ROI complex
- Smaller vendor than Decagon/Sierra on recent funding
Source: Vendr marketplace. Last verified April 2026.
Cognigy
Contact sales- Market leader in enterprise voice AI
- Best multilingual coverage in the category (50+ languages)
- Deep telephony integrations (Genesys, Avaya)
- Longest implementation timeline (12-20 weeks)
- Not viable for SMB or mid-market
- No free trial or self-serve option
Source: Cognigy.com public materials. Last verified April 2026.
Common Questions
How much does Decagon AI cost?
Decagon does not publish pricing. Based on Vendr marketplace data and G2 buyer reports, the median ACV (annual contract value) is approximately $400,000, with a floor engagement of around $50,000. Pricing is primarily per-conversation and enterprise-quote-based. Buyers should expect an 8-16 week implementation timeline in addition to licensing costs.
How much does Sierra AI cost?
Sierra uses outcome-based pricing exclusively -- a pre-negotiated rate per autonomous resolution. Pricing is not published. Sierra reported $100M ARR in November 2025 and raised $350M at a $10B valuation in September 2025. All of this points to enterprise-only contracts in the $200K+ range. Sierra is not a viable option for companies with budgets under $200K/year or implementations under 8 weeks.
How much does Ada CX cost?
Ada CX starts at approximately $30,000 per year for the base platform. At scale, per-resolution pricing ranges from $1.00 to $3.50. Additional costs include $5,000-$50,000 for language expansion and $10,000-$100,000 for custom workflow development. Contracts typically include 3-7% annual price escalation clauses. Source: G2 buyer reports and marketplace data.
How much does Forethought cost?
Forethought's median ACV is approximately $59,500 per year based on Vendr marketplace data, with a range of $40,000 to $160,000. Pricing is platform-fee plus committed-deflection-volume based. Forethought is stronger than most at multi-agent routing and triage, which is the primary differentiation versus other enterprise vendors.
Compare Public-Pricing Alternatives
If any of the enterprise vendors above are out of budget or require more transparency, these vendors publish their pricing: