Retell AI Pricing Explained: What Agencies Pay Per Client

Retell AI charges $0.07 to $0.31 per minute for voice agents on its pay-as-you-go plan, as of September 2026. That per-minute price covers voice infrastructure, the voice, the AI model and telephony. Phone numbers cost $2 per month, and new accounts get $10 in free credits.

All rates below come from Retell AI’s pricing page. Check it for current numbers, because AI model prices change often.

How is Retell AI’s per-minute price calculated?

Retell AI’s per-minute price is the sum of four components: voice infrastructure at $0.055, the voice at $0.015 to $0.040, the AI model at roughly $0.0016 to $0.16, and telephony at $0.015. The AI model is the part that varies most.

Component	Retell AI price (Sept 2026)
Voice infrastructure	$0.055 / min
Voice (text-to-speech)	$0.015 / min for Retell and most voices; $0.040 / min for ElevenLabs voices
AI model (LLM)	From about $0.0016 / min for the smallest models up to about $0.16 / min for the largest
Telephony	$0.015 / min (varies by country); $0 if you bring your own SIP trunk

A receptionist that books appointments rarely needs the largest model; a complex sales or support agent might.

What other Retell AI costs should agencies budget for?

Beyond per-minute usage, agencies should budget for Retell AI’s fixed monthly charges: $2 per phone number, $8 per concurrent call above the free 20, $8 per knowledge base above the free 10, and $20 for SMS.

• Phone numbers: $2 per month each, or $10 per month for a verified number.
• Concurrency: 20 simultaneous calls are free; each extra concurrent call is $8 per month.
• Knowledge bases: 10 are free, then $8 per knowledge base per month.
• SMS: $20 per month.
• Enterprise: custom pricing with custom contract terms, role-based access and 24/7 support.

How much does one Retell AI client cost an agency per month?

Here is a worked example for one client: a medical front desk agent handling 1,000 call minutes a month on one phone number. We assume Retell’s standard voice, Retell telephony, and a small AI model at an illustrative $0.01 per minute.

Line item	Calculation	Monthly cost
Voice infrastructure	1,000 × $0.055	$55.00
Voice	1,000 × $0.015	$15.00
AI model (example rate)	1,000 × $0.01	$10.00
Telephony	1,000 × $0.015	$15.00
Phone number	1 × $2	$2.00
Total Retell AI cost		$97.00

That works out to roughly $0.095 per minute all-in for this setup, such as a medical front desk agent. Healthcare clients also need a signed BAA; see what HIPAA requires for AI receptionists. Switch to ElevenLabs voices and it rises by $25 per 1,000 minutes; pick a much larger model and the AI model line can grow several times over.

Where does Call Supplai fit into Retell AI pricing?

Call Supplai does not mark up Retell AI minutes. You connect your own Retell AI API key, so Retell bills usage directly to your Retell account at the rates above. Call Supplai charges a flat $197 per month for the white-label platform (see pricing), with no setup fee, no matter how many minutes your clients use.

So an agency’s monthly cost is:

Call Supplai ($197) + Retell AI usage for all clients = total cost

Using the example above, an agency with five similar clients would pay about $197 + (5 × $97) = $682 per month in total. Whatever you charge those clients above that is your margin. See how to price AI voice agent services for ways to set that price.

How can agencies lower their Retell AI costs?

• Right-size the model. Test your agent on smaller models first; scheduling and FAQ agents often perform well on them.
• Use Retell’s standard voices unless a client specifically needs a premium voice.
• Bring your own telephony through SIP if you already have a carrier contract.
• Keep prompts and knowledge bases tight, so calls resolve faster and fewer minutes are billed.

Want to see what your first clients would cost? Book a Call Supplai demo and we’ll walk through the numbers with you.