# The Best AI Support Agents (2026)

> Source: https://theagentsindex.com/best-ai-support-agents (curated, quality-gated, re-verified)

Every AI support agent in this category sells outcome- or resolution-based pricing, but they split sharply on one thing that matters more than any feature list: can you actually try it? Intercom Fin is the only one of the six with a public price, a self-serve signup and a 14-day free trial. Sierra, Decagon, Crescendo, Cresta and Ada are all enterprise, sales-led engagements with no published full-suite pricing — you start with a pilot or a contract, not a signup form.

A second, more subtle split cuts across those five enterprise names. Sierra, Decagon, Crescendo and Ada are all built to resolve a conversation end to end and hand off to a human only on exception. Cresta is built the other way around: its AI Agent resolves conversations too, but the platform's bigger emphasis is Agent Assist and the newer Knowledge Agent, which keep supporting the human rep continuously rather than stepping back once a human takes over. It's the one listing here explicitly built to augment a blended AI-and-human operation, not just replace one.

A third split cuts across pricing opacity: whether you can actually build against the platform without a sales contract. Ada is the outlier here — sales-led on price like Sierra, Decagon and Crescendo, but the only one of the five enterprise names that ships a documented, self-serve Conversations/Email API and an MCP server, a real developer surface none of its enterprise-sales peers publish.

So this is not a single top pick. It is the 6 Published, independently researched AI support agents in our index, grouped by that real buying decision — self-serve versus a managed enterprise engagement, and full replacement versus blended augmentation — with an honest note on what each one actually gets you and where its pricing or proof falls short of the pitch.

| # | Name | What it is | Pricing | API |
| --- | --- | --- | --- | --- |
| 1 | [Intercom Fin](https://theagentsindex.com/intercom-fin.md) | Intercom’s customer-service AI agent, resolves tickets omnichannel over any helpdesk, billed per resolution. | $0.99 / resolution | Yes |
| 2 | [Sierra](https://theagentsindex.com/sierra.md) | Bret Taylor’s enterprise agent platform, branded AI agents that resolve customer issues end to end, priced on outcomes. | Custom | — |
| 3 | [Decagon](https://theagentsindex.com/decagon.md) | Enterprise AI customer-service agents that resolve conversations end to end across chat, voice and email, $4.5B-valued, sales-led, no public pricing. | Custom | No |
| 4 | [Crescendo](https://theagentsindex.com/crescendo.md) | Fully-managed AI-native customer service, replaces your entire CX stack with agents, QA and human-in-the-loop support, billed per resolution. | From $2.99 / per resolution | No |
| 5 | [Ada](https://theagentsindex.com/ada.md) | A Toronto-founded, $1.2B-valued AI customer-service agent platform predating the LLM wave — sales-led, no public pricing, a genuine public API. | Custom | Yes |
| 6 | [Cresta](https://theagentsindex.com/cresta.md) | Unifies an autonomous AI Agent, real-time human Agent Assist and Conversation Intelligence on one contact-center platform, enterprise, custom-quoted, no self-serve tier. | $150,000 / year (12-month contract) | Yes |

## Methodology

Every entry is a Published listing that already cleared this site's per-listing quality gate — sourced facts, admitted weaknesses, a "best for" and a "not for," re-verified on a rolling cadence (see /methodology). support-agents was the smallest category on the site to clear the 4-listing minimum for its own ranking and has since grown to 6 — every Published support-agent listing still appears here, unlike the flagship /best-ai-agents page's narrower "Support agents" group. Ordering leads with the one self-serve option, then the enterprise, sales-led options, roughly by how much independent, named proof each publishes (case studies, ARR, funding) rather than by vendor claims alone; the live score chip on every card (evidence, honesty, depth, freshness) is computed the same way as that tool's own listing page.