Buyer's guide

Best AI customer support agents in 2026

AI support agents now answer, act and hand off across chat, email and voice. They differ most in who they're built for, how they're tested before going live, how risky actions are approved and how they charge.

Last updated 6 October 2026

How we chose

We make BeforeQuery, so it's listed first; weigh that. Every other product is described from its own public website, checked on 6 October 2026, with the pages linked at the end. We've tried to say plainly where each one is the better choice.

Answers from your own knowledge, with a hand-off when it isn't sure.
Can take actions (refunds, order changes) with limits and human approval.
Can be tested on realistic conversations before customers see it.
Works with the helpdesk and channels you already use.
Clear pricing model.

At a glance

Tool	Best for	Asks a person before acting	Pricing
BeforeQuery	Teams adding AI to support and other teams on one platform	Yes: limits and caps, approval in Slack	Not published; set on a short call.
Intercom Fin	Intercom users; many channels including voice	Yes: "Loop in teammate"	$0.99 per outcome
Zendesk AI agents	Teams already on Zendesk	Yes: Custom Agents set where approval is required	Per automated resolution, included in plans
Decagon	Enterprises wanting engineering-grade testing	Approval of agent changes; per-action not documented	Not published
Sierra	Very large consumer brands, voice	Approval of agent changes; per-action not documented	Outcome-based, not published
Ada	Enterprises with a contact centre	Not documented publicly	Per conversation, not published
Forethought (Zendesk)	Non-Zendesk helpdesks wanting triage and gap-finding	Not documented publicly	Platform fee plus outcomes, not published

1. BeforeQuery

An AI Support Agent that works inside Zendesk or Intercom, one of five AI employees (IT, Support, Marketing, Sales, Finance) on one platform.

Best for: Teams that want AI in support and in other teams, with one set of approval rules in Slack.

What stands out

Refunds and cancellations with a per-refund limit plus caps per customer and per day; only verified customers can trigger them.
Rehearsal on your own past tickets, with your team marking answers good or bad.
Finds the questions it couldn't answer and drafts the missing answer.

Worth knowing

Chat and email through your helpdesk; no voice channel.
Newer than the specialists in this list.

Pricing: Not published; set on a short call.

2. Intercom Fin

An AI agent for customer service that answers and resolves conversations, natively in Intercom or alongside Zendesk, Salesforce, Freshdesk and HubSpot.

Best for: Teams on Intercom, or teams on another helpdesk who want published per-outcome pricing and many channels.

What stands out

Channels include voice, email, Messenger, Slack, WhatsApp, SMS, Instagram and Facebook Messenger.
Procedures in natural language with conditions and code; "Loop in teammate" pauses for approval.
Simulations, regression tests and evals built from real conversations.

Worth knowing

On helpdesks other than Intercom, approvals run through a webhook that Intercom doesn't track.

Pricing: $0.99 per outcome (minimum 50 a month on another helpdesk); on the Intercom helpdesk, plus seats from $29 a month billed yearly ($39 monthly).

3. Zendesk AI agents

AI agents built into Zendesk Suite and Support plans that answer from connected knowledge and act across systems.

Best for: Teams already on Zendesk who want AI agents included in their plan.

What stands out

Messaging, email and voice in 60+ languages.
Commerce agents (launched 14 September 2026) connect to Shopify, Stripe, Narvar and Riskified.
Custom Agents let you set where human approval is required.

Worth knowing

Built around Zendesk; some specialised agents can also run in Salesforce and ServiceNow.

Pricing: Per automated resolution; plans from $19 to $115 per agent a month (billed yearly) include 5–10 resolutions per agent, then $1.50–$2.00 each.

4. Decagon

A platform for enterprises to build, run and improve AI customer-service agents across chat, email and voice.

Best for: Enterprises that want natural-language procedures with engineering-grade testing and versioning.

What stands out

Agent Operating Procedures (AOPs) written in natural language, with sensitive checks in code.
Simulations with auto-generated tests, scheduled runs and CI/CD integration.
Works with Zendesk, Salesforce, Intercom and Kustomer.

Worth knowing

Changes its Autopilot proposes need human approval; approval of individual customer actions isn't described.

Pricing: Not published; per conversation or per resolution.

5. Sierra

A conversational AI platform that large companies use to build branded customer-facing agents, including voice.

Best for: Very large consumer brands building custom agents, especially on voice.

What stands out

Voice (inbound and outbound), chat, SMS, WhatsApp, Apple Business Chat, email and ChatGPT, in 59 languages.
Simulations including voice, regression tests and split-traffic releases.
Release approvals and reviewer roles for changes to the agent.

Worth knowing

Aimed at large enterprises; approval of individual customer actions isn't described publicly.

Pricing: Outcome-based; not published.

6. Ada

A platform for enterprises to run AI agents that answer and complete customer tasks across voice, messaging and email.

Best for: Enterprises that want one agent across channels in front of an existing contact centre.

What stands out

Works with Zendesk, Salesforce, Freshworks, ServiceNow, Genesys, Amazon Connect and others.
Tools stay off until you turn them on.
Simulations on synthetic test cases with pass/fail outcomes.

Worth knowing

Simulations use synthetic cases rather than your past conversations.

Pricing: Mainly per conversation; not published.

7. Forethought (by Zendesk)

AI agents that resolve, triage and analyse support tickets on top of existing helpdesks; acquired by Zendesk in March 2026.

Best for: Teams on a non-Zendesk helpdesk who want resolution, triage and knowledge-gap finding together.

What stands out

Triage that tags, prioritises and routes tickets, tested on up to 1,000 past tickets.
Discover finds knowledge gaps and drafts articles.
Works with Zendesk, Salesforce, Intercom, Kustomer, Gladly, HubSpot and more.

Worth knowing

Now sold as "Forethought AI agents by Zendesk"; check how that affects your roadmap.

Pricing: Platform fee plus outcome-based cost; not published.

How to choose

Start with your helpdesk: if you're on Intercom or Zendesk, try their built-in agents and compare.
Ask to see answers on your own past tickets, not a demo script.
Check how refunds and other money actions are limited and who approves them.
Compare pricing on your real volume: per outcome, per resolution and per conversation add up differently.
If other teams also need AI, consider one platform rather than one tool per team.

See BeforeQuery's AI Support Agent rehearse on your own tickets.

Book a demo

Questions

What's the difference between per-outcome and per-resolution pricing?

Per resolution usually charges only when a conversation is closed without a person. Per outcome, as Fin uses it, also counts procedure hand-offs. Per conversation charges for every conversation.

Do AI support agents replace a helpdesk?

Most work inside or alongside one. Intercom and Zendesk sell both; others like Decagon, Ada and BeforeQuery connect to the helpdesk you have.

Sources

Facts about other products come from their own public websites, checked on 6 October 2026. Products change; if something here is out of date, tell us and we'll fix it.