Ranked · Support agents
The Best AI Support Agents (2026)
9 AI customer-support agents — Sierra, Decagon, Intercom Fin, Zendesk AI Agents, Crescendo, Cresta, Ada, Botsify and Auto-Respond — compared on what actually differs: self-serve access, pricing model, published proof, how much staffing comes bundled in, and whether the agent replaces human reps or works alongside them.
The ranking
12 agents, compared. Start with fit and price, then open the full assessment. Payment does not alter this ranking. Selection and method ↓
All picks at a glance
Compare fit and price, then choose a name to read the full assessment.
| # | Agent | Best for | From |
|---|---|---|---|
| 1 | FinSelf-serve, public pricingvs Sierra | Support teams from mid-market to enterprise that want an AI agent layered over their existing helpdesk with pay-per-resolution economics, omnichannel coverage and a built-in tuning loop. | $0.99 |
| 2 | Auto-RespondSelf-serve, public pricing | Local service business owners who lose leads to slow follow-up and want phone and marketplace messages answered and booked automatically on their own calendar. | $99/mo |
| 3 | Zendesk AI agentsSelf-serve trial, seat price public — resolution rate undisclosed | Support teams already committed to (or actively evaluating) Zendesk as their core helpdesk who want the AI agent to come from the same vendor and billing relationship, rather than layering a third-party agent on top. | $19/seat/mo |
| 4 | BotsifyPublic price, managed build — not self-serve | Small businesses and agencies that want a managed, prompt-based AI agent across chat channels, or want to resell one under their own brand, from an established, decade-old vendor. | $149/mo |
| 5 | SierraEnterprise, sales-led — full replacementvs Fin | Large enterprises that want branded, autonomous customer agents that resolve issues end to end and are willing to run a managed engagement. | On quote |
| 6 | DecagonEnterprise, sales-led — full replacementvs Ada | Large enterprises in retail, travel, fintech, health and telecom that want a heavily-funded, actively-improving AI agent to handle high-volume customer conversations across chat, voice and email, and that can run a multi-week, engineering-supported implementation. | On quote |
| 7 | CrescendoEnterprise, sales-led — full replacement | Mid-market and enterprise support teams that want a fully outsourced, compliance-ready AI-native CX operation, including live channels, without staffing or building one in-house. | Usage-based |
| 8 | AdaEnterprise, sales-led — full replacementvs Fin | Enterprises that want a long-running, well-capitalized AI support agent vendor with a public V2 REST API and an MCP server, rather than a sales-only integration surface. | On quote |
| 9 | CrestaEnterprise, sales-led — blended augmentationvs Sierra | Large enterprises running high-volume | $150,000/yr |
| 10 | IrisAgentIn this category, not yet ranked | On quote | |
| 11 | Maven AGIIn this category, not yet ranked | On quote | |
| 12 | AideIn this category, not yet ranked | On quote |
Selection, context, and ranking method
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, and at what price? Two of the nine are genuinely self-serve with a fully posted price and a free trial: Intercom Fin ($0.99 per resolution, 14-day no-card trial) and Auto-Respond, the one small-business entry here, priced per channel from $10/month for a voice number plus $1 per minute of talk time, with a 7-day trial. Zendesk AI Agents sits in its own middle case: a 14-day no-card trial and a fully public per-seat price ($55–$115/agent/month for the Suite plans that include AI Agents) make signup genuinely self-serve, but the usage meter on top of that seat price, the per-resolution rate, is undisclosed, so you can start without a sales call yet still can't fully price it out in advance. Botsify is the only other listing here with any public price at all, $149/month for its Done-for-You plan, but that price buys a managed build Botsify's own team assembles for you, not a self-serve dashboard. Sierra, Decagon, Crescendo, Cresta and Ada publish no full-suite pricing whatsoever. You start with a pilot or a contract, not a signup form or a posted rate.
A second, more subtle split cuts across the six full-resolution names. Sierra, Decagon, Crescendo, Ada and Zendesk AI Agents 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. Botsify, on its Done-for-You plan, is also built for full resolution rather than augmentation, closer in intent to Sierra, Decagon, Crescendo, Ada and Zendesk than to Cresta, but publishes no resolution rate or named case study to weigh against them.
A third split cuts across developer access, independent of price. Ada and Zendesk AI Agents are the only two of the enterprise-leaning names that ship a fully documented, publicly-browsable developer API (Ada's Conversations/Email API plus an MCP server; Zendesk's long-standing developer.zendesk.com platform and app marketplace), a real developer surface Sierra, Decagon and Crescendo don't publish at all. Botsify also ships a genuine API (a public Postman collection), despite its own price being public but its onboarding still a managed build rather than self-serve. That makes Ada, Zendesk AI Agents, Botsify and Auto-Respond (a REST webhook plus a Lead Reply API) the four listings here a developer can actually integrate against without a sales-gated SDK.
So this is not a single top pick. It is all nine independently researched AI support agents in our index, grouped by those real buying decisions: self-serve versus publicly-priced-but-managed versus enterprise sales-led, full replacement versus blended augmentation, and which ones actually ship a usable developer API. Each carries an honest note on what it actually gets you and where its pricing or proof falls short of the pitch.
Every entry is a Published listing that already cleared this site's per-listing quality gate on 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 9. Every support-agent listing on the site still appears here, unlike the flagship /best-ai-agents page's narrower "Support agents" group. Ordering leads with the two fully self-serve options (Intercom Fin, then Auto-Respond), then Zendesk AI Agents' self-serve-signup-but-undisclosed-usage-rate case, then Botsify's publicly-priced-but-managed tier, 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.
The ranking
Self-serve, public pricing
Editor’s pick
Best forSupport teams from mid-market to enterprise that want an AI agent layered over their existing helpdesk with pay-per-resolution economics, omnichannel coverage and a built-in tuning loop.
One of only two here you can try without a sales call: $0.99 per resolution, a 14-day no-card trial, and a documented API that Intercom says layers onto Zendesk, Salesforce or Freshdesk in under an hour. The catch is the resolution meter itself: Intercom's 76% headline rate outruns what independent analyses see in many real deployments (nearer 40–50%), and billing counts a customer who simply stops replying as a paid "resolution."
- #2
Auto-Respond
AI voice and messaging agent that answers calls and marketplace leads, qualifies them, and books jobs.
Best forLocal service business owners who lose leads to slow follow-up and want phone and marketplace messages answered and booked automatically on their own calendar.
The only listing here built for a small local service business rather than a support queue: it answers the phone and replies to Yelp, Thumbtack, Facebook, Instagram and Google LSA leads in under two seconds, then checks the live calendar and books the appointment itself, escalating emergencies and out-of-scope questions to the owner with the conversation context attached. Pricing is fully published and per channel ($10/month for a voice number plus $1 per minute of talk time, $19 for Facebook Lead Ads, $49 for Messenger, $99 each for Thumbtack and Yelp), with a 7-day trial and a REST webhook plus Lead Reply API for wiring it into a custom CRM. The honest caveat is proof: no independent reviews exist yet, so the specifics are the vendor's own claims, and the per-channel, per-minute meter means the real cost depends entirely on how many channels you turn on.
Self-serve trial, seat price public — resolution rate undisclosed
- #3
Zendesk AI agents
Customer-service AI agents for messaging, email and voice, billed per automated resolution.
Best forSupport teams already committed to (or actively evaluating) Zendesk as their core helpdesk who want the AI agent to come from the same vendor and billing relationship, rather than layering a third-party agent on top.
The only listing here bundled into an existing helpdesk platform rather than sold standalone: a 14-day no-card trial and a public per-seat Suite price ($55–$115/agent/month) make signup genuinely self-serve, but the per-resolution usage rate on top of that seat price is undisclosed: independent analysis puts it around $1.20–$1.50 per Verified Resolution. A May 2026 billing change stopped charging for escalations and abandoned conversations, and a full public developer API (developer.zendesk.com) matches Ada's as the category's best-documented.
Public price, managed build — not self-serve
- #4
Botsify
White-label platform for prompt-built chat and voice agents, plus a done-for-you agent build service.
Best forSmall businesses and agencies that want a managed, prompt-based AI agent across chat channels, or want to resell one under their own brand, from an established, decade-old vendor.
The only other listing here with any public price at all: $149/month for its Done-for-You plan. But that price buys a managed build Botsify's own team assembles for you, not a self-serve dashboard: a decade-old (2016), bootstrapped alternative to the enterprise scale of the five sales-led names, with a genuine developer API (a public Postman collection) but no published resolution rate or named case study to weigh against Sierra's or Decagon's.
Enterprise, sales-led — full replacement
- #5
Sierra
Conversational AI platform for building enterprise customer-service agents across voice, chat, email and ChatGPT.
Best forLarge enterprises that want branded, autonomous customer agents that resolve issues end to end and are willing to run a managed engagement.
The deepest enterprise track record in the category: Bret Taylor's Agent Studio has passed $100M ARR in under two years and reached roughly half the Fortune 50, with agents that complete real actions (refunds, subscription changes, order tracking) across six channels from one definition. There is no public price, free tier or self-serve API; access is a negotiated enterprise engagement.
- #6
Decagon
Enterprise AI support agents for chat, voice and email, built from natural-language Agent Operating Procedures.
Best forLarge enterprises in retail, travel, fintech, health and telecom that want a heavily-funded, actively-improving AI agent to handle high-volume customer conversations across chat, voice and email, and that can run a multi-week, engineering-supported implementation.
The best-funded name here ($4.5B valuation, $481M raised) and the only one publishing named case studies with hard numbers attached: Duolingo's 80% deflection rate, ClassPass's 95% cost reduction. Its plain-English Agent Operating Procedures let support staff, not just engineers, shape agent behavior, but reviewers report 4–12 week implementations and there is no published price: third-party analysis estimates $74K–$600K+/year depending on volume.
- #7
Crescendo
AI-native CX platform whose agents resolve customer contacts across voice, chat, email and messaging.
Best forMid-market and enterprise support teams that want a fully outsourced, compliance-ready AI-native CX operation, including live channels, without staffing or building one in-house.
The only one of the eight selling staffing alongside software: its 2024 PartnerHero acquisition folded in 3,000+ human-in-the-loop CX workers, so a Crescendo contract can replace an entire outsourced support operation rather than just add a bot on top of one. Per-resolution pricing (from $2.99) bundles setup and 100%-of-conversation QA under a "Total Outcome Guarantee," but there is no API or self-serve signup, and surge fees apply once you exceed your estimated monthly volume.
- #8
Ada
Enterprise AI customer-service agents that resolve inquiries across voice, chat, email and social channels.
Best forEnterprises that want a long-running, well-capitalized AI support agent vendor with a public V2 REST API and an MCP server, rather than a sales-only integration surface.
The pre-LLM-era incumbent: founded 2016, years before Decagon, Crescendo or Cresta existed, and still backed by a $1.2B valuation. Its real edge over the other enterprise names is developer access: a documented Conversations/Email API and an MCP server, which Sierra, Decagon and Crescendo don't publish at all. The catch is a real satisfaction gap: 4.6/5 on G2 from the admins who configure it, but just 2.0/5 on Trustpilot from the customers actually chatting with it.
Enterprise, sales-led — blended augmentation
- #9
Cresta
Contact-centre AI platform for voice and digital AI agents, real-time human agent assist, and conversation analytics.
Best forLarge enterprises running high-volume
Cresta's real differentiator among these eight is scope: instead of an AI Agent that replaces a human conversation, it unifies that AI Agent with real-time Agent Assist and the newer Knowledge Agent to keep supporting human reps continuously, not just on handoff, backed by $280M+ raised, 500+ employees, and named outcomes like Xanterra's 74% containment rate and $3.3M recovered revenue. Pricing is the most opaque in the category: the only public number anywhere is an AWS Marketplace listing for the narrower Agent Assist SKU alone, from $150,000/year for one channel; the full AI Agent and Conversation Intelligence suite is entirely custom-quoted.
In this category, not yet ranked
- #10
IrisAgent
AI support agent that resolves chat, email and phone tickets inside your existing helpdesk.
- #12
Aide
Governed agentic AI that resolves customer support issues end to end inside Zendesk, Front and Gorgias.
Side by side
Scroll across to compare every product. Feature names stay in view.
| Feature | Fin | Auto-Respond | Zendesk AI agents | Botsify | Sierra | Decagon | Crescendo | Ada | Cresta | IrisAgent | Maven AGI | Aide |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Description | Customer service AI agent priced per resolved outcome, deployable on any helpdesk. | AI voice and messaging agent that answers calls and marketplace leads, qualifies them, and books jobs. | Customer-service AI agents for messaging, email and voice, billed per automated resolution. | White-label platform for prompt-built chat and voice agents, plus a done-for-you agent build service. | Conversational AI platform for building enterprise customer-service agents across voice, chat, email and ChatGPT. | Enterprise AI support agents for chat, voice and email, built from natural-language Agent Operating Procedures. | AI-native CX platform whose agents resolve customer contacts across voice, chat, email and messaging. | Enterprise AI customer-service agents that resolve inquiries across voice, chat, email and social channels. | Contact-centre AI platform for voice and digital AI agents, real-time human agent assist, and conversation analytics. | AI support agent that resolves chat, email and phone tickets inside your existing helpdesk. | Enterprise AI agent platform for customer support across chat, email, voice and web. | Governed agentic AI that resolves customer support issues end to end inside Zendesk, Front and Gorgias. |
| Category | Support agents | Support agents, Voice agents | Support agents | Agent platforms, Support agents | Support agents, Agent platforms | Support agents | Support agents | Support agents | Support agents, Agent platforms | Support agents | Support agents | Support agents |
| Pricing | $0.99 / outcome | $99/month | $19 / agent/month, billed annually | $149/month | Custom | Custom | From $2.99 per resolution / per resolution | Custom, contact sales | $150,000 / year (12-month contract) | Paid | Paid | Paid |
| Tags |
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Frequently asked questions
- What is the best AI agent for customer support?
- It depends on how you want to buy. For a self-serve team that wants to try before committing, Intercom Fin and Auto-Respond are the only two of these nine with fully public pricing and a free trial. If you're already on (or moving to) Zendesk and want the AI agent to come from the same vendor and billing relationship, Zendesk AI Agents — self-serve to start, though its usage rate isn't published. For a public price without a self-serve dashboard — a managed build from a small, established vendor — Botsify. For an enterprise that wants the deepest, most proven platform, Sierra. If published, named case-study proof matters most, Decagon. If you want the software AND the outsourced human staff bundled into one contract, Crescendo. If you want an established incumbent with a real developer API, Ada. If a blended AI-and-human operation — not a full replacement — is the actual goal, Cresta. And for a small local service business fielding phone calls and Yelp/Thumbtack/Facebook leads rather than a support queue, Auto-Respond.
- Which AI support agents have a free trial or self-serve pricing?
- Two are fully self-serve: Intercom Fin ($0.99 per resolution, with a 14-day no-card-required free trial) and Auto-Respond (priced per channel from $10/month for a voice number plus $1 per minute of talk time, with a 7-day trial). Zendesk AI Agents is a middle case: a 14-day no-card trial and a public per-seat Suite price ($55–$115/agent/month) make signup self-serve, but the per-resolution usage rate isn't published. Botsify publishes a price too ($149/month) but it is not self-serve — Botsify's own team builds the agent for you, and no trial length is stated on its current pricing pages. Sierra, Decagon, Crescendo, Cresta and Ada are all enterprise, sales-led products with no published full-suite pricing or public signup — every engagement starts with a pilot or negotiated contract (Cresta discloses one narrow AWS Marketplace price for its Agent Assist product alone, not the full platform).
- How much do AI support agents cost?
- Intercom Fin is $0.99/resolution (50-resolution monthly minimum on your own helpdesk, or +$29/seat/month on Intercom). Zendesk AI Agents requires a Suite Team plan or higher ($55–$115/agent/month) plus usage-based resolution billing on top; Zendesk doesn't publish the exact per-resolution rate, but independent analysis puts it around $1.20–$1.50 per Verified Resolution. Botsify's Done-for-You plan is $149/month ($1,490/year), though that buys a managed build rather than a self-serve seat; its separate White Label/agency plan publishes no price at all. Crescendo starts at $2.99/resolution, all-inclusive. Decagon publishes no price; independent analysis estimates roughly $74K–$600K+/year depending on volume. Sierra also publishes no price — it negotiates a custom outcome-based rate per enterprise contract. Cresta publishes no price for its core AI Agent or Conversation Intelligence products either; the only public number anywhere is an AWS Marketplace listing for Agent Assist alone (chat OR voice), from $150,000/year for a 12-month contract. Ada also publishes no price; third-party purchase-data analysis puts the median contract at $73,500/year, scaling to $300K+/year for the largest deployments. Auto-Respond is the cheapest entry point on the page and the only per-channel one: $10/month for a voice number plus $1 per minute of talk time, $19/month for Facebook Lead Ads, $49/month for Facebook Messenger, and $99/month each for Thumbtack and Yelp.
- Why do these AI agents report such different "resolution" rates?
- Because "resolved" isn't defined the same way everywhere. Intercom reports a 76% average resolution rate for Fin, but independent analyses of its own published case studies often find real-world rates nearer 40–50%, and its billing counts a customer who simply stops replying as a resolution. Decagon's reviewers report similar disputes over what counts as a billable resolution. Read each listing's own sourced pros/cons before comparing headline rates across vendors.
- How is Cresta different from Sierra, Decagon, Ada and Zendesk AI Agents?
- Sierra, Decagon, Ada and Zendesk AI Agents are all built to resolve a conversation end to end and hand off to a human only on exception. Cresta's AI Agent does that too, but the platform's bigger emphasis is Agent Assist and Knowledge Agent, which keep supporting the human rep continuously — a blended AI-and-human model rather than a full-replacement one. Sierra, Decagon and Crescendo share largely custom-quoted, sales-led pricing with no free trial; Ada and Zendesk AI Agents are the two full-replacement names that at least offer self-serve trial access, even though neither publishes its exact usage rate.
- Which AI support agent has a public developer API?
- Intercom Fin's API is the only one paired with genuinely self-serve, no-sales-call, fully disclosed pricing. Ada and Zendesk AI Agents both publish a fully documented developer platform — Ada's Conversations/Email API plus an MCP server, Zendesk's long-standing developer.zendesk.com API and app marketplace — but neither discloses its AI-agent usage pricing in full. Botsify publishes a genuine API too (a public Postman collection) — its price is public, though the product itself is a managed build rather than self-serve. Auto-Respond ships a REST webhook and a Lead Reply API for wiring the answering flow into a custom CRM. Sierra's Agent SDK and Cresta's API-based integrations are real but gated to contracted customers; Decagon and Crescendo have no self-serve API or public developer docs at all.
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