Best AI voice agent for GoHighLevel (2026)

For most GoHighLevel agencies, the best AI voice agent is either HighLevel's own built-in Voice AI or a third-party platform with a native HighLevel marketplace app, such as Outbox AI. HighLevel Voice AI keeps everything inside one tool. A dedicated platform like Outbox adds whitelabel client rebilling without the $497 Agency Pro plan, a choice of phone carriers, and AI chat on the same agent.

Disclosure: we make Outbox AI. Every competitor fact below comes from that company's own pricing page or docs, checked on 3 October 2026.

The short answer

• Already on Agency Pro ($497/month), and happy with HighLevel's voice? Use HighLevel Voice AI. Unlimited voice is $97 per sub-account a month, and rebilling with markup is included in your plan.
• Want to rebill AI calls at your own margin without Agency Pro, or want voice, chat and workflows outside HighLevel too? Use Outbox AI. It's a native HighLevel marketplace app with AI call and AI chat workflow actions, and Stripe rebilling from $149/month.
• You're a developer building custom agents: Retell AI and Vapi both have native HighLevel tools for contacts and calendar booking. You'll build the client dashboard and billing yourself.

What "native GoHighLevel integration" should mean

Plenty of voice tools claim to "work with GoHighLevel" when they only fire a webhook. A real integration should do five things:

1. Install through HighLevel's marketplace (OAuth), not a pasted API key per location, so it works across sub-accounts.
2. Book into HighLevel calendars while the call is live, checking real availability.
3. Add workflow actions, so a HighLevel workflow can trigger an AI call when a lead comes in.
4. Write back to the contact: call logs, transcripts, tags, opportunities and pipeline stage.
5. Hand over cleanly to a human, on the phone and in the conversation inbox.

Comparison: AI voice agents for GoHighLevel

The options in detail

HighLevel Voice AI (built in)

HighLevel's own voice agent lives inside the CRM, so there's nothing to connect. Whitelabel follows your HighLevel whitelabel.

• Pay-per-use: a $0.045/min voice engine fee, plus LLM tokens at API pricing, plus $0.015-$0.17/min for the voice. Phone system charges are extra.
• AI Employee plans: a flat $50 a month per sub-account for 100 minutes, or $97 a month for unlimited voice. Phone charges still apply.
• Rebilling: to rebill AI usage to clients with a markup, you need the $497/month Agency Pro plan.

Choose it if: you're already on Agency Pro, all your clients are on HighLevel, and you want one bill and one dashboard.

Outbox AI

Outbox is a whitelabel AI agent platform that installs into HighLevel through the marketplace (OAuth), one sub-account at a time:

• Connection: you approve the scopes (conversations, contacts, locations, calendars, workflows), pick the sub-account and add the AI Dialler custom provider.
• Calendars: every HighLevel calendar becomes bookable by your agents.
• Messaging: HighLevel's SMS, email, WhatsApp and Facebook Messenger channels become available to Outbox chat agents.
• Logs: call and chat logs sync back to the contact timeline.
• Workflow actions: Send AI Call (speed-to-lead and outbound campaigns), Activate AI Chat Agent, Interrupt AI Chat Agent, Query AI Chat Agent and Run AI Tool become available in HighLevel workflows.
• On the call: agents can create and move opportunities, add tags, update contacts and enrol contacts in workflows mid-conversation.

You also get things HighLevel doesn't do on its own: Stripe rebilling at your own per-minute rate from $149/month (no Agency Pro needed), your choice of Twilio, Vonage, Telnyx or SIP, and voice, chat and workflows for clients who aren't on HighLevel.

Pricing: $97, $149 or $279 a month, plus 14¢, 12¢ or 10¢ a minute for AI calls with model usage included. 14-day free trial. Setup guide.

Choose it if: you want to resell AI voice at your own margin, run clients both on and off HighLevel, or want chat and voice handled by the same agent.

Synthflow

Synthflow has a HighLevel marketplace app for outbound workflow actions, books into HighLevel calendars, and triggers inbound calls through a HighLevel webhook. But its public pricing is now enterprise-only, starting at $30,000 a year, and its Stripe integration for reselling to sub-accounts was removed on 15 September 2026.

Retell AI and Vapi

Both are developer platforms with native HighLevel tools: the agent can look up and create contacts, check availability and book appointments.

• Retell: connects with a Private Integration token, scoped to one sub-account per connection.
• Vapi: provides four tools (get contact, create contact, check availability, create event).

Neither adds HighLevel workflow actions, a whitelabel client portal or client rebilling, so agencies usually pair them with their own tooling.

Assistable, Autocalls and Stammer AI

• Assistable: has HighLevel roots and workflow actions on every plan, but now sells on custom quarterly proposals.
• Autocalls: connects through a private HighLevel app that you create yourself, with a solid set of actions.
• Stammer AI: its HighLevel app is built around chat messaging.

Setting up an AI voice agent in GoHighLevel: what usually goes wrong

• Calendar timezone mismatches. The agent offers times in the wrong timezone. Set the timezone on the agent and on the HighLevel calendar.
• Workflows firing twice. A form submission and a contact-created trigger both start the AI call. Use a single trigger and a tag guard.
• No human fallback. Always configure a transfer destination and a "call back later" path.
• Unverified caller ID. Outbound calls from unregistered numbers get flagged as spam. Register your numbers and keep campaign volumes reasonable.

Frequently asked questions

Does GoHighLevel have a built-in AI voice agent?

Yes. HighLevel Voice AI is built in. It costs $0.045 a minute for the engine plus LLM and voice charges, or $50-$97 a month per sub-account on AI Employee plans. Phone charges apply either way, and rebilling with markup needs the $497 Agency Pro plan.

What's the best third-party AI voice agent for GoHighLevel?

For agencies, the strongest option is a platform with a native HighLevel marketplace app plus workflow actions and built-in rebilling. Outbox AI offers all three from $149 a month. Retell AI and Vapi integrate natively for contacts and booking, but leave the client portal and billing to you.

Can I rebill AI voice minutes to GoHighLevel clients?

Yes, two ways. HighLevel's own AI rebilling with markup requires the $497/month Agency Pro plan. Alternatively, Outbox AI rebills calls through your own Stripe account at whatever rate you set, from its $149/month Growth plan, alongside any HighLevel plan.

How do I trigger an AI call from a GoHighLevel workflow?

With Outbox, add the Send AI Call action to any HighLevel workflow and choose your voice agent. A typical speed-to-lead workflow fires it the moment a form is submitted, so the lead gets a call within seconds.

Does it work across all my sub-accounts?

Outbox and Synthflow install through HighLevel's marketplace, connected per sub-account. Retell's integration is scoped to one location per connection.

Sources

Checked on official sites on 3 October 2026: HighLevel Voice AI pricing, HighLevel plans, Outbox GoHighLevel docs, Synthflow GoHighLevel docs, Synthflow pricing, Retell GoHighLevel docs, Vapi GoHighLevel docs, Autocalls GoHighLevel, Stammer GoHighLevel app, Assistable pricing.