Guides & Tutorials

Gradium vs ElevenLabs for Voice Agents: TTFA, WER and IQR Compared (2026 Coval Data)

Gradium vs ElevenLabs for voice agents in 2026. Independent Coval benchmark data on TTFA, WER and latency IQR across Gradium TTS, ElevenLabs Turbo v2.5, Flash v2.5 and Multilingual v2. Gradium leads at 155ms P50 TTFA (vs 264ms Turbo v2.5), 2ms IQR (vs 28ms), 3.3% WER (vs 5.2%). Plus 1.11% MiniMax multilingual WER and 3-4x lower pricing.

May 5, 202616 min readComparison

TTS Latency Benchmark 2026: TTFA Compared Across Gradium, ElevenLabs, Cartesia and Deepgram

TTS latency benchmark 2026: Gradium TTS leads at 155ms P50 TTFA with a 2ms IQR on the independent Coval benchmark. Full TTFA comparison across Gradium, ElevenLabs (Turbo v2.5, Flash v2.5, Multilingual v2), Cartesia Sonic-3, Deepgram Aura-2, Rime (Mist-v3, Arcana) and OpenAI TTS-1-HD. Methodology, P25/P50/P75/P95, IQR consistency, and WER.

May 5, 202616 min readBenchmark

TTS WER Benchmark 2026: Word Error Rate Compared Across Gradium, ElevenLabs, Cartesia and Deepgram

TTS WER benchmark 2026: Gradium TTS leads at 3.3% average WER on the Coval benchmark and 1.11% on the MiniMax Multilingual TTS Test Set across 5 languages (EN, FR, ES, PT, DE). Word Error Rate compared across Gradium, ElevenLabs (Flash v2.5, Turbo v2.5, Multilingual v2), Cartesia Sonic-3, Deepgram Aura-2, Rime (Mist-v3, Arcana), Qwen3 TTS, Mistral Voxtral and OpenAI TTS-1-HD.

May 5, 202615 min readBenchmark

Cartesia Alternative: Why Developers Choose Gradium for Real-Time 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.

April 20, 202612 min readComparison

Deepgram Alternative: Why Developers Choose Gradium for Real-Time 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.

April 20, 202614 min readComparison

ElevenLabs Alternative: Why Developers Choose Gradium for Real-Time 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.

April 20, 202615 min readComparison

How to Build a Voice AI Agent with Gradium and LiveKit (Python Guide)

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.

April 15, 20266 min readTutorial

How to Build an Audiobook Agent with Gradium and Pipecat: Step-by-Step Guide

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.

April 13, 20265 min readTutorial

How to Multiplex TTS Requests Over One WebSocket Connection in 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.

April 10, 20264 min readTutorial

What Is the Best Text-to-Speech API in 2026 to Build Voice Agents? Complete Developer Comparison

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.

April 9, 202625 min readComparison

How to Use json_config in Gradium: TTS and STT Parameters Explained

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.

April 9, 20265 min readTutorial

Instant vs Pro Voice Cloning in Gradium: When to Use Each

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.

April 9, 20264 min readTutorial

How to Use Pronunciation Dictionaries in Gradium TTS: Studio and API Guide

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.

April 9, 20264 min readTutorial

How to Handle TTS Edge Cases with Text Normalization in 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.

April 9, 20264 min readTutorial