Last updated 07-18-2026
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Millis AI
Millis AI is a voice agent platform for teams that need real-time phone and in-app conversations. It runs the full voice stack with roughly 600ms latency, so agents can keep up with live callers without awkward pauses. Builders use it for support lines, sales follow-ups, virtual receptionists, and voice embedded in web or mobile products.
The platform stitches together speech-to-text, LLM reasoning, and text-to-speech in one pipeline. You can spin up agents with natural language prompts in minutes, or wire them in through Python, JavaScript, and WebSocket SDKs. It plugs into OpenAI, Mistral, Llama, ElevenLabs, PlayHT, Cartesia, and custom models, and supports phone numbers in 100+ countries for inbound and outbound calling.
Product teams, agencies, and developers building voice into support, lead qualification, surveys, field coordination, or kiosk flows are the core audience. TMate Inc operates the platform on infrastructure built for high-volume real-time communication.
Roughly 600ms end-to-end latency on live voice calls
Phone numbers in 100+ countries for inbound and outbound deployment
No-code agent setup or SDKs for Python, JavaScript, and WebSocket apps
Swap between OpenAI, Mistral, Llama, or your own custom LLM
Voices from ElevenLabs, PlayHT, Cartesia, OpenAI, or your cloned voice
Webhooks connect agents to calendars, CRMs, and other SaaS mid-call
Make.com integration for no-code automation workflows
Sub-600ms latency target keeps live voice conversations feeling natural.
Supports 30+ languages across speech recognition and synthesis.
Usage pricing starts at $0.02/min before LLM and voice provider fees.
No-code agent setup alongside Python, JavaScript, and WebSocket SDKs.
Final cost stacks base platform, LLM, TTS, and STT charges separately.
No subscription tiers listed on the public pricing page.
Volume discounts for ElevenLabs require contacting the team directly.
How much does Millis AI cost?
Millis AI charges a $0.02 per minute base platform fee, plus separate costs for LLM tokens, text-to-speech characters, and speech-to-text at $0.0043 per minute. A 10-minute session with GPT-4o and ElevenLabs TTS runs about $0.66 total on the published example.
What LLM models does Millis AI support?
Millis AI supports GPT-4o, GPT-4 Turbo, GPT-3.5 Turbo, Meta Llama-3, and custom LLMs you host yourself. It can also auto-select the lowest-latency model from the available options for your agent configuration.
Can I use Millis AI for phone calls?
Yes. Millis AI lets you connect phone numbers for inbound and outbound voice agents in 100+ countries. It also supports SIP trunking, WebRTC, and embeddable call widgets for web apps.
What voice providers does Millis AI support?
Millis AI integrates with ElevenLabs, OpenAI, Cartesia, PlayHT, Deepgram, Neets, and Rime for text-to-speech. You can also bring a cloned voice. TTS is billed per 1,000 characters, with rates varying by provider.
What languages does Millis AI support?
Millis AI supports more than 30 languages including English, Spanish, French, German, Japanese, Korean, Hindi, Portuguese, and Ukrainian. The docs list the full set on the introduction page.
Does Millis AI have a free plan?
Millis AI does not list a free tier on its pricing page. Usage is pay-as-you-go, starting at $0.02 per minute for the base platform charge before LLM, TTS, and STT fees.
How do I deploy a Millis AI voice agent?
Millis AI agents can deploy to phone lines, web and mobile apps via SDKs, desktop apps, or an embeddable web widget. The docs cover Web SDK, WebSocket native apps, inbound and outbound call setup, and SIP trunking.