Open Source Models for Voice AI

Silero VAD — Silero VAD: pre-trained enterprise-grade Voice Activity Detector

Coqui TTS — 🐸💬 - a deep learning toolkit for Text-to-Speech, battle-tested in research and production

kokoro — https://hf.co/hexgrad/Kokoro-82M

Gradium — Build expressive, low latency voice AI with a unified API for text, speech, and cloning.

Izwi — Voice AI runtime for private deployment with an OpenAI-compatible API.

Llama — Inference code for Llama models

Common Voice — Mozilla's open, crowdsourced multilingual speech dataset for training speech recognition — millions of validated voice clips with transcripts across 100+ languages, released under CC0. The platform code is MPL-2.0.

Moonshot AI — Kimi-Audio, an open-source audio foundation model excelling in audio understanding, generation, and conversation

Hume AI — TADA is an open-source speech-language model from Hume AI.

Agora — Real-time voice AI platform enabling natural, low-latency conversations.

Speechmatics — Open-source AI speech tech for enterprise, offering real-time transcription, translation, and TTS.

Zonos — Zonos-v0.1 is a leading open-weight text-to-speech model trained on more than 200k hours of varied multilingual speech, delivering expressiveness and quality on par with—or even surpassing—top TTS providers.

DeepSeek-V3 — DeepSeek-V3 — open source.

KugelAudio — Europe's first production-ready TTS with 40+ languages, developed and hosted in Europe, fully GDPR compliant.

Patter — Open-source SDK for voice AI to connect any agent to real phone calls in 4 lines.

Kyutai — Pocket TTS is a compact text-to-speech model small enough to run on a CPU — fast, lightweight, on-device voice generation.

Vosk — Offline speech recognition API for Android, iOS, Raspberry Pi and servers with Python, Java, C# and Node

F5-TTS — Official code for "F5-TTS: A Fairytaler that Fakes Fluent and Faithful Speech with Flow Matching"

QwenLM — Qwen3.6 is the large language model series developed by Qwen team, Alibaba Group.

Fish Audio — Open-source AI voice platform with high-quality TTS and voice cloning in multiple languages.

SpeechBrain — A PyTorch-based Speech Toolkit

Ultravox — Real-time, speech native voice AI infrastructure for fast, natural, scalable voice agents.

Rasa — The developer platform for enterprise AI agents.

ChatTTS — A generative speech model for daily dialogue.

DeepSpeech — DeepSpeech is an open source embedded (offline, on-device) speech-to-text engine which can run in real time on devices ranging from a Raspberry Pi 4 to high power GPU servers.

Myshell — Instant voice cloning by MIT and MyShell. Audio foundation model.

LobbyStack — Open-source AI receptionist that answers calls, qualifies leads, books appointments, and routes urgent requests 24/7.

VibeVoice — Open-Source Frontier Voice AI

MiniMax — MiniMax-M3 is an open-source large language model released by MiniMax, available on GitHub to run and build on.

Dograh — Open-source voice platform for custom, self-hosted voice agents and pipelines.