# Gradium

> Gradium develops audio language models for natural, expressive, ultra-low latency voice interactions at scale.

Gradium provides text-to-speech (TTS), speech-to-text (STT), and speech-to-speech AI models optimized for real-time voice agent applications.

For the full version of this document with complete article content, see: https://gradium.ai/llm-full.txt

## Key Resources

- [API Documentation](https://docs.gradium.ai): Complete API reference for Gradium's voice AI platform
- [Pricing](https://gradium.ai/pricing): Pricing plans and credit allocations
- [Blog](https://gradium.ai/blog): Technical articles and company updates
- [Studio](https://studio.gradium.ai/): Voice playground and management interface

## Technical Content

- [Deepgram Alternative: Why Developers Choose Gradium for Real-Time Voice AI](https://gradium.ai/content/deepgram-alternative-gradium-voice-ai): Gradium vs Deepgram comparison for real-time voice AI. Voice cloning (not available on Deepgram), semantic VAD, voice-agent-tuned TTS with published TTFA benchmark, and cloud-to-on-device deployment from one API.
- [ElevenLabs Alternative: Why Developers Choose Gradium for Real-Time Voice AI](https://gradium.ai/content/elevenlabs-alternative-gradium-voice-ai): Gradium vs ElevenLabs comparison for real-time voice AI. Voice-agent-tuned TTS with published TTFA benchmark, semantic VAD, accent-preserving voice cloning with highest Elo scores, and cloud-to-on-device deployment.
- [Cartesia Alternative: Why Developers Choose Gradium for Real-Time Voice AI](https://gradium.ai/content/cartesia-alternative-gradium-voice-ai): Gradium vs Cartesia comparison for real-time voice AI. Voice-agent-tuned TTS with robust pronunciation, semantic VAD in STT, accent-preserving voice cloning, and cloud-to-on-device deployment from one API.
- [How to Build a Voice AI Agent with Gradium and LiveKit (Python Guide)](https://gradium.ai/content/how-to-build-voice-ai-agent-gradium-livekit): Learn how to build a full voice AI agent using Gradium STT and TTS with the LiveKit agent framework. Step-by-step Python guide covering AgentSession setup, VAD, interruptions, preemptive generation, tools, and deployment.
- [How to Build an Audiobook Agent with Gradium and Pipecat: Step-by-Step Guide](https://gradium.ai/content/audiobook-agent-gradium-pipecat): Learn how to build a real-time story narrator with Gradium TTS and Pipecat. This step-by-step guide covers installation, pipeline setup, voice configuration, and deployment in about 100 lines of Python.
- [How to Multiplex TTS Requests Over One WebSocket Connection in Gradium](https://gradium.ai/content/multiplexing-tts-websocket-gradium): Learn how to reuse a single WebSocket connection for multiple concurrent TTS requests in Gradium using multiplexing. Covers close_ws_on_eos, client_request_id, and how to route interleaved audio chunks correctly.
- [What Is the Best Text-to-Speech API in 2026 to Build Voice Agents? Complete Developer Comparison](https://gradium.ai/content/best-text-to-speech-api-voice-agents): Best text-to-speech API 2026: Gradium achieves 258ms P50 TTFA (214ms with multiplexing) with expressive multilingual voices and robust pronunciation. Complete real-time TTS comparison for developers building voice agents.
- [How to Use json_config in Gradium: TTS and STT Parameters Explained](https://gradium.ai/content/how-to-use-json-config-gradium-tts-stt): Learn how to use the json_config field in Gradium to control rewrite_rules, padding_bonus, temp, and cfg_coef for TTS, and language and delay_in_frames for STT. Full parameter reference with code examples.
- [Instant vs Pro Voice Cloning in Gradium: When to Use Each](https://gradium.ai/content/instant-vs-pro-voice-cloning-gradium): Not sure whether to use Instant or Pro Voice Cloning in Gradium? Learn the key differences, what each is designed for, how to prepare your audio for Pro cloning, and how to choose based on your use case.
- [How to Use Pronunciation Dictionaries in Gradium TTS: Studio and API Guide](https://gradium.ai/content/pronunciation-dictionaries-gradium-tts): Learn how to use Pronunciation Dictionaries in Gradium to control how words are spoken and filter unwanted content. Step-by-step guide for Gradium Studio and the Python SDK.
- [How to Handle TTS Edge Cases with Text Normalization in Gradium](https://gradium.ai/content/text-normalization-tts-edge-cases-gradium): Learn how to use Gradium's Text Normalization feature to handle edge cases in TTS. Configure rewrite_rules with language aliases or specific normalizers for dates, numbers, emails, URLs, phone numbers, and alphanumeric codes.

## Company Information

- Product: Voice AI platform (TTS, STT, Speech-to-Speech)
- Key differentiator: Ultra-low latency (<220ms TTFA), high quality voice synthesis, instant voice cloning
- Deployment options: Cloud API, dedicated instances, self-hosted, on-premises
- Free tier: Available with no credit card required