# Best AI voice agent for GoHighLevel (2026) By the Outbox AI team. Updated 2026-10-03. **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 | Option | How it connects to HighLevel | Workflow actions | Client rebilling | Voice cost per minute | |---|---|---|---|---| | **HighLevel Voice AI** | Built in | Native | Agency Pro ($497/mo) only | $0.045 engine + LLM + voice, or $50-$97/mo per sub-account | | **Outbox AI** | Marketplace app (OAuth) + AI Dialler provider | Send AI Call, Activate/Interrupt/Query AI Chat Agent, Run AI Tool | Stripe, from $149/mo | 14¢ / 12¢ / 10¢, model and voice included | | **Synthflow** | Marketplace app + inbound webhook | Outbound call actions | Stripe reselling removed Sep 2026 | Enterprise only, from $30k/yr | | **Assistable** | Marketplace listing | GHL workflow actions on every plan | Yes | Custom proposal | | **Autocalls** | OAuth through your own private GHL app | Triggers plus opportunity, task, workflow and booking actions | Stripe ($419/mo whitelabel tier) | $0.09 overage on top tiers | | **Stammer AI** | Marketplace app | "Send message to AI agent" (chat) | Yes ($99/mo whitelabel) | $0.11-$0.17 by model | | **Retell AI** | Private integration token, one location per connection | No (agent-side tools) | No | ~$0.07-$0.31 all-in per Retell's estimate | | **Vapi** | Tool provider: contacts + calendar | No (agent-side tools) | No | $0.05 hosting + model, voice, transcription and telephony | | **VoiceAIWrapper** | Webhooks / API / Zapier | No | Stripe | Your provider's rates | ## 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](/guides/what-is-outbox-ai) 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](https://docs.getoutbox.ai/gohighlevel). **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](https://help.gohighlevel.com/support/solutions/articles/155000006652), [HighLevel plans](https://www.gohighlevel.com/pricing), [Outbox GoHighLevel docs](https://docs.getoutbox.ai/gohighlevel), [Synthflow GoHighLevel docs](https://docs.synthflow.ai/docs/integrate-with-gohighlevel), [Synthflow pricing](https://synthflow.ai/pricing), [Retell GoHighLevel docs](https://docs.retellai.com/integrations/gohighlevel), [Vapi GoHighLevel docs](https://docs.vapi.ai/tools/go-high-level), [Autocalls GoHighLevel](https://autocalls.ai/integration/go-high-level), [Stammer GoHighLevel app](https://docs.stammer.ai/stammer.ai-docs/chat-ai-agents/integrations/gohighlevel-ghl-app), [Assistable pricing](https://www.assistable.ai/pricing).