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Build voice, video, and physical AI agents

An open source framework and developer platform for building, testing, deploying, scaling, and observing agents in production.

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Powering billions of calls in production for:
Open AI
Skydio
xAI
Headspace
Salesforce

OpenAI built ChatGPT’s Advanced Voice on LiveKit Cloud, used by millions of users around the world every day.

Run millions of concurrent calls
Automatic turn detection and interruption handling
Deploy and scale agents with LiveKit Cloud
Simple and Powerful APIs

Quickly build voice agents 

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session = AgentSession(
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  stt="deepgram/nova-3",
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  llm="openai/gpt-5.3-chat-latest",
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  tts="cartesia/sonic-3",
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  turn_detection=MultilingualModel()
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)
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Voice AI quickstartBuild a simple voice agent with Python or Node.js in less than 10 minutes.
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Voice agent starter appsBring your agent to life through a web or mobile app.
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Integrate with telephonyEnable your voice agent to make or take phone calls.
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Deploy to LiveKit CloudRun your agents on LiveKit's global realtime infrastructure.
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Developer platform

The complete stack for Voice AI

Open source framework to build and test agents
Inference gateway to access TTS, LLM, and STT models
Cloud platform for deploying and scaling agents
Phone numbers and SIP integrations for telephony
Full-stack observability for every agent session
Explore the LiveKit Cloud platform

How it works

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User speaks to agent via app, browser, or phone call
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User speech is streamed from device to agent
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Agent receives user speech and runs your custom business logic
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Agent responds back to the user
View documentationlivekit/agents 11.1K
Built for scale

Enterprise grade
infrastructure

GDPR ✓
SOC 2 Type 2 ✓
HIPAA ✓
1.00%
Uptime
1000ms
Global latency
1,000+
Developers
2,500,000,000+
Calls annually
1+
Regions globally
Chosen by Innovators

From startups to industry giants

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Podium logo

Reliability and accelerating time to production often seem at odds, but with LiveKit’s Agent Platform, we achieved both! Its ease of use, feature-rich and flexible architecture, and production-ready infrastructure allowed us to deploy our voice agents with confidence.

Walker Ward Principal Software Engineer, Podium
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LFG. LiveKit is goated
Alex Cohen @anothercohen
Link to X post
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LiveKit has a lot to offer. one of the best platforms out there for real-time AI integrations and communication systems.
Mojibola Olalekan @Ola_dev01
Link to X post
Retell AI logo

We recently moved from a homegrown WebSocket stack to LiveKit Cloud, allowing us to flexibly integrate with telephony systems and offer a unified export interface across web and phone calls. This upgrade also lets us deliver low latency calls to a global end-user base.

Zexia Zhang CTO, Retell AI
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Infrastructure for realtime voice assistants. The demo (kitt.livekit.io) is 🔥
Guillermo Rauch @rauchg
Link to X post
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damn @livekit python sdk for tts and set was so smooth
Ivan Leo @ivanleomk
Link to X post
Playback

Not having to worry about our ability to scale has been massive. We just have LiveKit worry about that scaling for us and have a predictable cost.

Ari Borensztein Co-founder & CTO, Playback
Link to Playback customer testimonial
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In the midst of our huge Arcana launch, the @livekit team jumped in, shipped new code, and shaved some meaningful latency off our homepage live chat demo. 

This team is cracked. 

A little delayed but wanted to give them a proper public shoutout!
Lily Clifford @lilyjclifford
Link to X post
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I'm making my first voice AI agent with:
- @livekit, makes it 10x easier
- @OpenAI for LLM and voice
- @DeepgramAI for speech detection
- @Railway for hosting
- @twilio for telephony

I have tried a few no-code tools, but they don't have the flexibility and reliability of code… pic.twitter.com/yvbugxELee
— Amir Ranjbar (@arro_sh) May 19, 2025
Amir Ranjbar @arro_sh
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Assort Health logo

LiveKit enables us to very granularly fine-tune our agent code for every workflow and use any model provider. No other platform gives us this level of control.

Jeffery Liu Founder & Co-CEO, Assort Health
Link to Assort Health customer testimonial
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This is great "end of turn" detection by @livekit.

Going to see if I can get this running client-side in a browser today.https://t.co/ilmtrrewyN
jtgi @jtgi
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Learn to build conversational AI voice agents in "Building AI Voice Agents for Production", created in collaboration with @livekit and @realavatarai, and taught by @dsa (Co-founder & CEO of LiveKit), @shayneparlo (Developer Advocate, LiveKit), and @nedteneva (Head of AI at… pic.twitter.com/al8xAojqvW
Andrew Ng @AndrewYNg
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Spara logo

Voice AI is at the heart of Spara's platform for GTM AI agents. Agents on LiveKit Cloud gives us effortless deployments and rock-solid hosting, enabling us to launch rapidly and iterate quickly, all while preserving full flexibility to deeply customize and integrate our voice agents. With infrastructure off our plate, we can fully focus on delivering exceptional sales-focused voice AI.

Alex Looney Staff ML Engineer, Spara
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LFG. LiveKit is goated
Alex Cohen @anothercohen
Link to X post
X
LiveKit has a lot to offer. one of the best platforms out there for real-time AI integrations and communication systems.
Mojibola Olalekan @Ola_dev01
Link to X post
Polymath logo

Low-latency video streaming is existential for any robotics company. We just couldn’t have continued to build our platform if we didn’t have LiveKit.

Ilia Baranov Co-Founder & CTO, Polymath
Link to Polymath customer testimonial
X
Infrastructure for realtime voice assistants. The demo (kitt.livekit.io) is 🔥
Guillermo Rauch @rauchg
Link to X post
X
damn @livekit python sdk for tts and set was so smooth
Ivan Leo @ivanleomk
Link to X post

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Start building a voice AI agent with a free account. Reach out to us if you're interested in custom pricing.

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No credit card required • 1,000 free agent session minutes monthly