Retell AI Cost Calculator
Pick the LLM (or a speech-to-speech model), TTS voice and telephony, then enter call minutes. The calculator adds Retell's $0.055/min voice infra, per-minute add-ons (knowledge base, denoising, guardrails, PII), QA minutes, batch and branded calls, phone numbers, knowledge bases and concurrency above 20, and returns monthly total and $ per minute. Estimates only; retellai.com/pricing prevails.
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Monthly total
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Cost per minute
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Breakdown
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Formula: per minute = LLM + Retell voice infra $0.055 + TTS + telephony + add-ons; monthly = minutes × per-minute + QA ($0.10/min after 100 free) + batch dials × $0.005 + branded calls × $0.10 + numbers × $2 + extra knowledge bases × $8 + concurrency above 20 × $8. Speech-to-speech models (GPT Realtime $0.345, Realtime mini $0.07 per min) replace LLM + TTS; infra is still billed. Retell's page default is $0.11/min (GPT 5 $0.04 + infra $0.055 + platform voice $0.015, custom telephony). Pay-as-you-go range $0.07–$0.31/min; $10 free credit. Verified numbers ($10 / mo) and Enterprise volume pricing are not modeled.
Estimates only. Official list prices as of 2026-11-01 (Asia/Shanghai); the provider's pricing page prevails. Sources: Retell AI pricing
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How it works
- How much does Retell AI cost per minute?
- Pay-as-you-go runs $0.07–$0.31 per minute. Retell's default is $0.11/min: GPT 5 LLM $0.04 + voice infra $0.055 + platform voice $0.015 + custom telephony $0. Retell Twilio/Telnyx numbers add about $0.015/min in the US.
- Which LLM and voice options change the price most?
- LLM: GPT 5 mini $0.008, GPT 4.1 mini $0.0128, Gemini 3.0 Flash $0.016, Claude 4.5 haiku $0.025, GPT 5 $0.04, GPT 5.6 Terra $0.064 per min (fast tier ~2×). Voices: platform/Cartesia/OpenAI $0.015, ElevenLabs Flash $0.04 up to v3/v4 $0.10 per min. Speech-to-speech GPT Realtime is $0.345/min, Realtime mini $0.07/min, with infra still billed.
- What do Retell add-ons cost?
- Per minute: knowledge base +$0.005, advanced denoising +$0.005, safety guardrails +$0.005, PII removal +$0.01. AI QA $0.10/min after 100 free minutes. Batch calls +$0.005 per dial; branded calls +$0.10 per outbound call.
- Are there monthly fees on Retell?
- No platform fee. Retell phone numbers are $2/month (custom numbers free), verified numbers $10/month, knowledge bases $8/month each beyond 10 free, and concurrency $8 per call per month above the 20 included. New accounts get $10 free credit.
- What does 1,000 minutes cost on Retell?
- With the default stack ($0.11/min) and custom telephony: $110/month. With Retell US telephony ($0.015) it is $125; switching to GPT 5 mini drops it to $78 + $15 telephony = $93.