Sierra vs Decagon
Pricing and features, side by side. Checked October 14, 2026.
| Sierra | Decagon | |
|---|---|---|
| Starting price | Not public — contact sales | Not public — contact sales |
| Billing | Outcome-based (quote only); blended/consumption available for some use cases | Per-conversation or per-resolution (enterprise quote) |
| Best for | Large brands wanting CX agents across chat, voice and messaging with outcome-based pricing | Enterprise CX teams that want to own and iterate AI support agents across chat, voice and email |
| Key features | One agent across chat, SMS, WhatsApp, email, voice and ChatGPT | Agent Operating Procedures (AOPs): workflows in natural language |
| 59 languages (product page); Decagon's comparison page cites 58 | Unified chat, voice and email on one intelligence layer | |
| Ghostwriter builds agents from SOPs, transcripts and plain English | Duet proposes agent improvements with human approval |
Both sell enterprise AI agents for customer experience across chat and voice; neither publishes dollar rates. Sierra's model is outcome-based (pay when agreed outcomes land; escalations usually free), with optional consumption for greeter/routing. Decagon offers per-conversation or per-resolution pricing and says most customers pick per-conversation. Decagon emphasizes Agent Operating Procedures (AOPs) owned by the CX team; Sierra emphasizes Ghostwriter-built agents and an outcome-aligned partnership.
Pick Sierra if you want outcome-based pricing and a vendor-led agent partnership across chat, voice and messaging.
Pick Decagon if you want per-conversation predictability and natural-language AOPs your team can iterate without an engineering SDK.