10 Leading AI Agents for Customer Support in 2026: A Real-World Comparison

This AI agent comparison puts ten leading AI agents for customer support side by side: each vendor's own resolution figure and how it counts it, what it bills for, time to launch, helpdesks and voice. The headline numbers count different things, so rank them by definition first and by percentage second.

An agent that only answers responds to a question and stops. An agent that resolves reads the order or the account, takes the action (a refund, an address change) and closes the ticket without a person. Only the second is an AI agent for customer support in the sense used below, and it's the one a resolution figure measures.

Gartner predicts that by 2029 agentic AI will autonomously resolve 80% of common customer service issues without human intervention, with a 30% reduction in operational costs. That's a forecast. Real-world here means numbers the vendors and their customers publish today, each attributed to whoever states it. None of it comes from running the agents on the same tickets. That's the job of a pilot.

One disclosure: we make CoSupport AI, and its AI Agent is number 9. The order is editorial and carries no ranking.

The evidence matrix: what each vendor publishes

One row per agent, from each vendor's own pages. Quotation marks mark exact words; "not shown" means the page didn't say.

Agent	Own resolution figure	Bills for	Time to launch	Works with	Voice
Fin (formerly Intercom Fin)	76% average resolution rate across 12,000+ businesses	$0.99 per outcome; minimum commitments apply	"Under an hour"; "go live in hours"	Intercom; any helpdesk, including Salesforce, Freshdesk, HubSpot, Zendesk	Yes, Fin Voice, on a custom plan
Zendesk AI agents	"Up to 80% of customer interactions"	Per automated resolution: $1.50 committed, $2.00 pay-as-you-go	"From day one"	Zendesk; Forethought's agents for other platforms	Yes, voice AI agents
Decagon	None of its own; a customer tile reads "70% chat and voice resolution"	Not public; "Get a demo"	Not shown	Salesforce, Intercom, Zendesk, and more	Yes
Sierra	None we could attribute to Sierra itself	"Outcome-based pricing", no price	"Deploy in weeks", no figure	"40+ pre-built integrations", no helpdesk named	Yes
Ada	"Over 80%" of customer inquiries; 84% automated resolution rate	Per conversation; a resolution-based model for some enterprises	6 to 9 days for chat; 4 to 6 weeks for voice	Zendesk, Salesforce, Twilio	Yes
Salesforce Agentforce	85% of Salesforce's own service requests	$2 per conversation	Not shown	Salesforce ecosystem	Yes
PolyAI	90% of calls resolved end to end, on its largest deployments	Per minute; no price shown	"About six weeks"	Phone systems and contact-center platforms by SIP or PSTN	Voice-first
Tidio Lyro	75% average resolution rate	Per Lyro conversation (one AI reply counts); "$0.5 per conversation" on Lyro Connect; the Premium plan lists "Pay-per-resolution billing"	Not shown	Tidio; Zendesk, Intercom, Salesforce, 20+ platforms	Not shown
CoSupport AI Agent	74% average; up to 90% of repetitive tickets	$0.50 per resolved AI conversation	About 10 minutes to connect	Zendesk, Freshdesk, Intercom, Zoho Desk; standalone widget	Billed per minute, separate
YourGPT	"Up to 90% of repeated queries"	Plans at $39, $79 and $349 a month, billed annually	"Live in minutes"	No helpdesk named	Yes, a phone agent

Read the first two columns with the definitions in hand. Fin bills an outcome: a resolution, but also Procedure handoffs, disqualifications and self-serve routings, at $0.99 each. Zendesk bills a request resolved without escalation, checked by an LLM when the conversation ends. PolyAI counts calls resolved with no human agent. On its standard plans Tidio counts a Lyro conversation, meaning at least one AI reply. CoSupport counts a conversation as resolved when the customer hasn't replied for 72 hours after the AI's answer.

How to compare accuracy across AI agents

No table here ranks accuracy. Each vendor measures something else: a resolution rate, an automated resolution rate, calls resolved end to end, an average across customers or the best deployments. We list each figure in the vendor's own words and leave the ranking to a pilot. A copilot that drafts replies for agents needs a different test: how to evaluate an AI copilot for support agents.

Which helpdesks each agent runs on

Built for one helpdesk: Zendesk's own AI agents, included in every Suite and Support plan, and Fin on Intercom. Fin also says it works on any helpdesk, Zendesk among them. Decagon, Tidio and CoSupport AI Agent name both Intercom and Zendesk. Ada names Zendesk, Salesforce and Twilio. Agentforce promises "full integration with the Salesforce ecosystem". Sierra names "40+ pre-built integrations" and no helpdesk. More on the Zendesk side: best AI integrations for Zendesk.

sbb-itb-97114f1

The 10 AI agents, one by one

1. Fin (formerly Intercom Fin)

Intercom renamed itself Fin in May 2026, and Salesforce completed its acquisition of Fin on September 10. The helpdesk keeps the name Intercom Helpdesk, and Fin runs on it natively. Fin's site says customers average a 76% resolution rate across 12,000+ businesses, rising 1% a month on average.

Intercom's Fin features and capabilities in 2026, from Fin's own pages:

Capability	What Fin says
Latest version	Fin 4, "our most powerful agent yet"
Channels	Chat, email, voice, social, Slack and API; WhatsApp and SMS on the pricing page
Helpdesks	Native on Intercom; "any helpdesk" including Salesforce, Freshdesk, HubSpot and Zendesk
Actions	Guidance, Procedures and integrations that let Fin "read and write to your systems"
Testing and QA	Simulations, Evals, and AI-powered Insights and QA
Billing	$0.99 per outcome; a resolution is confirmed, or assumed after 24 hours
Launch	"Set it up in under an hour"
Voice and languages	Fin Voice, on a custom plan for select customers; 45 languages

2. Zendesk AI agents

Zendesk includes AI agents in every Suite and Support plan and prices them on "the successful outcomes they deliver": $1.50 per automated resolution on a commitment, $2.00 pay-as-you-go, with 5 to 10 resolutions included per agent each month. Zendesk says its agents "resolve up to 80% of customer interactions", a ceiling. They work across social, web, mobile, voice and email, and you can automate requests "from day one".

3. Decagon

Decagon is "powering concierge experiences for the world's leading enterprises". Teams define workflows in natural language through Agent Operating Procedures, and one layer covers chat, voice and email. Voice runs on Chord, Decagon's own speech model. The site shows no price ("Get a demo") and no figure of its own; a customer tile reads "70% chat and voice resolution".

4. Sierra

Sierra's site promises "outcome-based pricing" and shows no price. One agent deploys "across chat, SMS, WhatsApp, email, voice, and ChatGPT", and its voice product can "collect card and ACH payments entirely over the phone with no IVR handoff". The customers page shows resolution tiles whose owners we couldn't read unambiguously, so we leave them out.

5. Ada

Ada calls itself "the AI customer service platform built for enterprise". Its site claims it can "resolve over 80% of customer inquiries" and lists an 84% automated resolution rate. Billing is conversation-based ("you pay for every conversation your AI agent has with end users"), with a resolution-based model "for enterprises with specific needs". Its own guide says a chat agent can be ready "in 6 to 9 days".

6. Salesforce Agentforce

Salesforce lists Agentforce at "$2 USD/Per conversation", and its Service AI page describes the Help Agent's "pay-per-resolution pricing model" without a figure. The same page sells Fin at "$0.99 USD/Resolution" with a minimum commitment. Salesforce's own number, "Agentforce resolves 85% of Salesforce's customer service requests", describes its own support queue.

7. PolyAI

PolyAI now calls itself "The Agentic Dialog Platform", and voice is where it starts. Its homepage claims "90% of calls resolved end to end, with no human agent, on our largest deployments"; "largest deployments" makes that a ceiling. The voice agent is "priced on a per-minute basis" with no figure shown, and its model-only API costs "2¢ per connected minute". PolyAI says it "takes about six weeks to build, integrate, and deploy" a voice assistant, with calls routed in by SIP or PSTN.

8. Tidio Lyro

Tidio sells Lyro, its AI agent, inside its own chat and helpdesk or on other platforms: Tidio lists "Zendesk, Intercom, Salesforce, and 20+ platforms". Its site says "our customers average a 75% resolution rate with Lyro". What it bills on its standard plans is a Lyro conversation, a customer interaction with "at least one reply from our AI agent", resolved or not; the Premium plan, priced on request, lists "Pay-per-resolution billing". Self-serve quotas start at $32.50 a month for 50 conversations on annual billing, and the AI agent page advertises "$0.5 per conversation".

9. CoSupport AI Agent

CoSupport AI Agent answers routine tickets from your help center and past tickets, and closes them. It runs inside Zendesk, Freshdesk, Intercom and Zoho Desk, or as a standalone widget, and connects in about 10 minutes. You pay $0.50 per resolved AI conversation. A conversation counts as resolved when the customer hasn't replied for 72 hours after the AI's answer, and escalated conversations are free. A 30-day pilot on your own tickets starts with the first 1,000 AI responses free; the pricing page has the details.

CoSupport's own figure is a 74% average resolution rate, up to 90% on repetitive tickets. Two cases from our customers page. Cocoatech reports an 81% autonomous resolution rate in January on Zendesk Suite, with resolution time down from 8h 54m to 5m 12s. ProjectFitter reports 75% of chats and 76% of emails resolved by AI on Freshdesk and Freshchat, fully deployed in 15 days. The agent works in 120+ languages. Security is ISO 27001, GDPR and CCPA. Each answer is checked against your own sources before it's sent.

10. YourGPT

YourGPT is purpose-built for teams needing AI automation across customer support, sales, and operations without technical resources. It combines a no-code visual builder with AI Studio, enabling businesses to deploy one AI agent across websites, WhatsApp, Instagram, Telegram, Slack, phone, and more, with instant synchronization and real-time workflow execution.

Built for rapid deployment, YourGPT says it resolves up to 90% of repeated queries automatically and handles multi-step workflows, including lead qualification, abandoned cart recovery, and order tracking. The platform deploys in minutes using pre-built templates and learns from interactions to continuously improve. Pricing is transparent at $39–$349/month based on chatbot volume and AI credits, with flexible model selection (GPT-3.5, GPT-4, Claude, o1) allowing teams to balance cost and performance.

However, retraining after a change in knowledge sources starts from a manual ReIndex button unless you schedule reindexing, and advanced features like custom branding and API and webhook support are restricted to higher tiers. For enterprises requiring on-premise deployment, alternative platforms might be better suited.

Head-to-head: five pairs buyers ask about

Fin vs Decagon

Both name Salesforce, Intercom and Zendesk, and both cover chat, email and voice, so helpdesk fit is a tie on paper. What differs is what each site shows before a sales call.

	Fin	Decagon
Own figure	76% average resolution rate across 12,000+ businesses	None of its own; a customer tile reads "70% chat and voice resolution"
Bills for	$0.99 per outcome; minimum commitments apply	Not public; "Get a demo"
Launch	"Under an hour"	Not shown
Voice	Fin Voice, custom plan, select customers	Decagon Voice, built on its own speech model, Chord

Fin publishes a price and a launch time. The Decagon pages we read show neither.

Zendesk AI agents vs Decagon

Zendesk's AI agents are a feature of the helpdesk. Decagon is a separate vendor, and its integrations page lists "Salesforce, Intercom, Zendesk, and more".

	Zendesk AI agents	Decagon
Where it runs	Inside Zendesk, in every Suite and Support plan	Separate product; syncs tickets from Zendesk and others
Price model	$1.50 committed or $2.00 pay-as-you-go per automated resolution; 5 to 10 included per agent each month	Not public
Own figure	"Up to 80% of customer interactions"	None of its own
Launch	"From day one", "no training or complex setup required"	Not shown

PolyAI vs a traditional IVR

PolyAI's own guide describes IVR as keypad presses or voice commands that leave callers with "predetermined menu options". Its pitch for the voice assistant is the absence of those menus.

	Traditional IVR, as PolyAI's guide describes it	PolyAI voice assistant, in PolyAI's words
How the caller asks	Presses keys, or says "specific keywords"	"Removing preset menus and allowing customers to speak naturally"
Where it ends	"Dead ends or irrelevant departments"	"Resolving them without escalation"
The claim	"rigid call flows leave callers stuck"	"90% of calls resolved end to end, with no human agent, on our largest deployments"

Voice is no longer PolyAI's alone: Fin, Zendesk, Decagon, Sierra and Ada all list a voice product or channel on their own pages. Test on live calls, starting with your most common call reasons.

CoSupport AI Agent vs Tidio Lyro

One number looks alike on both pages. The unit under it differs.

	CoSupport AI Agent	Tidio Lyro
Bills for	A resolved AI conversation: no customer reply within 72 hours after the AI's answer; escalated conversations are free	A Lyro conversation on the standard plans: "at least one reply from our AI agent", resolved or not; the Premium plan lists "Pay-per-resolution billing"
Price	$0.50 per resolved AI conversation	"$0.5 per conversation" on Lyro Connect (Plus and Premium); self-serve quotas from $32.50 a month for 50
Free to start	First 1,000 AI responses	"Your first 50 conversations are free (lifetime)"
Own figure	74% average, up to 90% of repetitive tickets	"Our customers average a 75% resolution rate with Lyro"
Works with	Zendesk, Freshdesk, Intercom, Zoho Desk, or standalone	Tidio's own helpdesk; "Zendesk, Intercom, Salesforce, and 20+ platforms"

eCatering, a UK catering-equipment shop with five agents on Freshdesk, reports email tickets resolved by AI rising from 41% in May to 50% in July, with an integration done in under an hour.

CoSupport AI Agent vs Intercom Fin and Ada

Fin runs on Intercom and, Fin says, on any helpdesk. CoSupport AI Agent runs on Zendesk, Freshdesk, Intercom and Zoho Desk. Ada is in the table because its site names Zendesk and Salesforce and lists voice among its channels.

	Fin	Ada	CoSupport AI Agent
Bills for	Per outcome ($0.99): resolutions, Procedure handoffs, disqualifications, self-serve routings	Per conversation; a resolution-based model for some enterprises	Per resolved AI conversation ($0.50); escalated conversations are free
On your helpdesk	Any helpdesk; a minimum commitment applies	Zendesk, Salesforce, Twilio named	Zendesk, Freshdesk, Intercom, Zoho Desk
Time to launch	"Under an hour"	6 to 9 days for chat	About 10 minutes to connect
Own figure	76% average, 12,000+ businesses	"Over 80%"; 84% automated resolution rate	74% average, up to 90% of repetitive tickets

To model cost at your ticket volume, see our comparison of AI support tools. If you're deciding whether to keep Intercom's helpdesk and change the AI agent, Fin alternatives after the Salesforce deal covers that choice.

How to run a pilot on your own tickets

Vendor figures mean little until they meet your tickets. Run a two-week pilot on 50 to 200 real tickets from the categories you want automated, the same set for every agent, and take the numbers from your helpdesk.

Measure	How to count it	Why it matters
Resolution rate	Tickets closed with no human touch, by your own definition	Vendor figures differ; yours is the one you'll live with
The vendor's count	Recount with each rule: 24 hours (Fin), 72 hours (CoSupport), an LLM check at the end of the conversation (Zendesk), any AI reply (Tidio, standard plans)	It shows what you'd be billed for
Escalation quality	Does the person who picks up get the context and the AI's draft?	A clean handoff saves minutes on every escalated ticket
Policy compliance	Review a sample of conversations where the agent acted, such as refunds	The agent should stay inside the limits you set

Define clear boundaries for autonomous actions before day one, a cap on refunds for example, and refresh your help center first: the agent answers from it.

"2026 is the year AI stops being a draft assistant and starts being an operator." William Westerlund, Suptask.

What goes wrong, and where people stay on the loop

Hallucination comes first. An agent that invents an answer costs more than one that hands off, so look for agents grounded in your own content with low rates of hallucination.

Next is your documentation. If the help center is thin or out of date, every agent's resolution rate drops with it.

Then write access. An agent that can refund or change an account needs limits, an audit trail, and personal data removed before it reaches a third-party model. Test for prompt injection, where a customer's message tries to steer the agent.

Keep human oversight in the design: a person reviews what the agent escalates and signs off on anything with write access.

"The winning model is human on the loop: agents review escalations, approve high-risk actions, and improve procedures, while AI handles the volume." William Westerlund, Suptask.

Key takeaways

• Compare the definition before the percentage. An outcome, an automated resolution, a conversation and a minute are four different things to bill.
• Check the helpdesk column first. It shortens the list before price matters.
• Ask each vendor what happens on a handoff and on a reopened ticket.
• Pilot on 50 to 200 of your own tickets, with the same set for every agent.

"The winners are not defined by which LLM they use. They win on orchestration, governance, and safe action." William Westerlund, Suptask 2026 Buyer Guide.