Millis AI Pricing 2026: What a Minute Really Costs

TL;DR: Millis AI pricing starts at a $0.02-per-minute platform fee, but that is not what you actually pay. Large language model, text-to-speech, and speech-to-text costs stack on top. A real 10-minute call using GPT-4o and ElevenLabs runs about $0.66 all-in, roughly $0.066 per minute, more than three times the headline rate.

Last updated: August 2026 · By Sandeep Singh, DailyFix

How does Millis AI pricing work?

Millis AI pricing is a stacked, usage-based model: a flat $0.02-per-minute platform base charge, plus separate per-minute costs for the language model, the voice (text-to-speech), and transcription (speech-to-text). According to Millis AI's pricing page (checked August 2026), there is no bundled all-in rate — your final cost depends on which providers you switch on.

That design is honest but easy to misread. The $0.02 figure is only the toll for running the Millis AI orchestration layer that connects your agent to the models. Everything the agent actually needs to think, speak, and listen bills on separate lines. If you have priced other voice platforms, this is the same passthrough logic Vapi uses, just with a lower base fee. Millis AI even offers a "Choose By Millis" option that auto-selects the lowest-latency language model for you, which is convenient but does not remove the stacked billing.

What is the real Millis AI cost per minute?

The real Millis AI cost per minute for a premium setup is about $0.066, not $0.02. Millis AI's own worked example puts a 10-minute GPT-4o plus ElevenLabs call at $0.6615: $0.20 base, $0.04 for the language model, $0.40 for ElevenLabs voice, and about $0.02 for transcription. The voice line, not the platform fee, is what dominates the bill.

Here is the piece most people miss. Text-to-speech is billed per character the agent speaks, not per minute of call, and a typical spoken minute runs around 500 characters. So a talkative agent on ElevenLabs quietly becomes your biggest cost center. Below is how the per-minute voice cost compares across the providers Millis AI supports, using figures from its pricing page as of August 2026.

Prices and limits change often — verify on the official pricing page before deciding.

What's the cheapest TTS setup for Millis AI?

The cheapest Millis AI setup pairs a bring-your-own or low-cost language model with Neets, OpenAI, or Deepgram voice. Dropping ElevenLabs (~$0.05/min) for OpenAI text-to-speech (~$0.0075/min) cuts the voice line by roughly 85%, which can pull an all-in call from about $0.066 per minute down toward $0.03 per minute. The trade-off is voice naturalness.

For a lead-capture or appointment-booking agent where callers just need clear answers, OpenAI or Deepgram voices are usually good enough and save real money at volume. Reserve ElevenLabs for calls where a warm, human-sounding voice directly affects conversion — think concierge lines or high-ticket sales. One more lever: because text-to-speech bills per character, tightening your agent's scripts so it says less per turn lowers the bill without changing providers. Millis AI also notes volume discounts of up to 25% on ElevenLabs for high-usage accounts, so ask before you scale.

Is Millis AI cheaper than Vapi or Retell AI?

On base platform fee, Millis AI is the cheapest of the three: $0.02 per minute versus Vapi at $0.05 per minute and Retell AI at roughly $0.07 per minute all-in. But base fee is not final cost. Millis AI and Vapi both stack provider charges on top, so your real bill depends on the voice and model you choose, while Retell AI's higher rate is more bundled.

According to Vapi's pricing (checked August 2026), it charges a $0.05-per-minute platform fee and passes speech, language, and voice costs through at cost — the same structure as Millis AI, just with a base fee that is 2.5x higher. Retell AI's pay-as-you-go voice agents start at about $0.07 per minute with no separate platform fee. The table below lines them up.

Prices and limits change often — verify on each official pricing page before deciding.

Frequently asked questions

Does Millis AI really cost $0.02 per minute?
No. The $0.02 per minute is only Millis AI's platform base charge. You also pay for the large language model, text-to-speech, and speech-to-text on top. A typical GPT-4o plus ElevenLabs call lands near $0.066 per minute all-in, based on Millis AI's own example as of August 2026.

What is the cheapest voice on Millis AI?
Neets is the cheapest text-to-speech at about $0.0005 per minute, followed by OpenAI and Deepgram at roughly $0.0075 per minute. ElevenLabs, the most natural-sounding option, is the priciest at about $0.05 per minute. Swapping ElevenLabs for OpenAI cuts the voice cost by roughly 85%.

Can I use my own LLM to save money on Millis AI?
Yes. Millis AI charges nothing extra when you bring your own large language model. You still pay the $0.02 platform base, plus your text-to-speech and speech-to-text, but the LLM line drops to zero on the Millis invoice. This helps if you already hold LLM credits or run a local model.

Is Millis AI cheaper than Vapi or Retell AI?
On the base platform fee, yes. Millis AI charges $0.02 per minute versus Vapi's $0.05 per minute. Retell AI bundles everything at about $0.07 per minute. But your final Millis bill depends entirely on which voice and model you pick, so a premium setup can erase the base-fee advantage.

Does Millis AI have a free plan?
Millis AI is usage-based rather than a flat monthly subscription, so you pay per minute of calls plus provider costs. New accounts typically get trial credit to test agents, but there is no perpetual free tier that covers live production traffic. Verify the current trial terms on the official pricing page before you build.

Do Millis AI TTS costs depend on how much the agent talks?
Yes. Text-to-speech is billed per character spoken, not per minute of call time, so a chatty agent costs more than a terse one. Millis AI estimates about 500 characters per spoken minute. Shorter, tighter agent replies directly lower your text-to-speech bill.

Bottom line

Millis AI is one of the cheapest voice-agent platforms to start on, thanks to its $0.02-per-minute base fee, and the transparent stacked pricing rewards anyone willing to tune their stack. Choose it if you want low-level control over model and voice costs and you will actually swap in cheaper providers where quality allows. Skip it if you want a single bundled per-minute price with no configuration — Retell AI is simpler there. For most solopreneurs, pair Millis AI with OpenAI or Deepgram voice, save ElevenLabs for calls that convert, and your real cost stays near $0.03 per minute.

Sources

• Millis AI — official pricing overview (checked August 2026)
• ColdIQ — Millis AI review, features and pricing (checked August 2026)

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