Comparison

Vapi vs Retell

Vapi lets you assemble the stack with your own keys; Retell is a managed voice API whose dashboard ¢/min is not always the invoice.

Neither product is a website chatbot. The Vapi vs Retell question in August 2026 is who operates speech, language, and telephony, and whether last month’s bill matches the dashboard. Guzli is column three only if on-site chat has to live on the same knowledge base. Voice on Guzli starts at Standard $149 + 16¢/min.

Vapi vs Retell vs Guzli

Side-by-side architecture. Guzli is column three, not the frame.

Dimension Vapi Retell Guzli
What it is Assemble-your-stack voice API. You pick STT, LLM, TTS, and telephony. Managed voice API. SDKs, SIP, IVR, DTMF, and live take-over on a dashboard plus invoice. No-code website chat plus inbound, outbound, and on-site voice on one knowledge base and one bill.
Price model $0.05/min hosting plus provider meters. This page does not invent an all-in Vapi ¢/min. Pay-as-you-go per-minute voice. The dashboard base rate can pick up an LLM token surcharge. Live docs document a 4,000-token threshold. Hobby $49 chat only (1,000 credits). Voice starts Standard $149 + 16¢/min. Pro $499 + 14¢/min. Overages billed; the bot stays up.
Who operates it You assemble and operate the vendors. Retell operates the managed stack; you still own prompts, tools, and telephony choices. Guzli SaaS. Ops edit answers. Named tools: Shopify, Stripe, Calendly/Cal.com, Zendesk, HubSpot, Salesforce.
Inbound vs outbound vs website Phone in and out via API. Not a support chatbot. Phone in and out via API. Not a support chatbot. Website chat plus inbound, outbound, and on-site voice on one agent.
Time to first live number An engineering session: keys, telephony, prompt. Dashboard plus API. Still a voice product to ship, not a site install. No-code chat on Hobby. A live number requires Standard voice.
Bottom line Stay to keep the build and BYOK. Stay for a managed voice API. Compare last month’s invoice to the dashboard, including any 4,000-token surcharge. Only if the website must share the same agent. Guzli will not out-API Retell.

10,000 talk-minutes, modeled not invented

Guzli Standard: $149 + $1,600 = $1,749 before transfer. Vapi remains $0.05 hosting plus the rest of the stack — not an invented all-in. Retell should be last month’s invoice (usage plus any 4,000-token surcharge), not the dashboard screenshot.

Bunny Honey Club labeled 10,000-call math — not 10,000 talk-minutes — at Retell about $2.8k, Bland Scale about $4.9k, and Vapi stack about $10–13k. That is their post, not Guzli’s model. Guzli is not competing to be the cheapest minute of PSTN.

Source: Bunny Honey Club, 3 July 2026

Latency without vendor folklore

Independent buyers treat latency as Retell’s story. Vendor sub-500ms figures are not what a caller hears. Openbenchmarks TTFAB was about 1.5s median (31 July 2026, via CloudTalk). Guzli does not publish a competing latency SLA here and does not claim to out-API Retell.

Choose-if

Two bullets each. No fake winner.

Vapi

  • Stay if you want to keep the build and bring your own keys.
  • Stay if assembling STT, LLM, TTS, and telephony is the job.

Retell

  • Stay for a managed, latency-sensitive voice API with SIP and live take-over.
  • Stay if an engineer will own prompts and tools, and you will reconcile dashboard ¢ vs invoice.

Guzli

  • Choose Guzli only if website chat, on-site voice, and phone need the same agent on one bill.
  • Hobby is chat-only. Voice starts on Standard at $149 + 16¢/min. Guzli will not out-API Retell.

FAQs: Vapi vs Retell

Is Vapi cheaper than Retell?
Vapi’s $0.05/min is hosting only. Retell’s dashboard base rate can pick up a 4,000-token LLM surcharge, so the invoice can exceed the dashboard. Cheap BYOK on Vapi can undercut a managed Retell minute. A fully stacked Vapi invoice can exceed it. Compare actual invoices. Guzli Standard is $149 + 16¢/min.
Can I BYO LLM on Vapi vs Retell?
Vapi is built for bring-your-own STT, LLM, TTS, and telephony. Retell is a managed voice API: you still configure models and tools, but you are not assembling the stack the Vapi way. Guzli bundles providers in the talk rate.
Who should stay on Vapi?
Stay on Vapi to keep the build, BYOK, and provider control. Send that team to Vapi, not to Guzli.
Who should stay on Retell?
Stay on Retell if you still want a latency-sensitive voice API with SDKs, SIP, and live take-over. Guzli will not out-API Retell.
Where does Guzli sit in a Vapi vs Retell shortlist?
Column three, only if you also need the website on the same knowledge base. Hobby is chat-only.

Pairwise pages and alternatives

Need the website on the same agent?

Hobby is $49 chat only. Voice starts on Standard at $149 + 16¢/min.

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