Voice AI
What's the best TTS API for real-time voice agents?
This benchmark report evaluates leading TTS APIs, including Murf Falcon, ElevenLabs, OpenAI, Cartesia, and Deepgram, across latency, voice quality, and cost efficiency. For those building real-time voice agents, this study identifies the tools offering the optimal balance of speed, accuracy, and price.
Key Learnings
- Global Latency: Discover how these TTS models perform across 33 edge locations to minimize time-to-first-audio.
- Voice Quality: Learn how the specialized Voice Quality Metric (VQM) evaluates naturalness, numerical accuracy, and multilingual fluency.
- Performance Stability: Understand how the Coefficient of Variance (CoV) measures the consistency and predictability of API speed across different geographies.
- Efficiency Quadrants: Gain insights into which tools offer the optimal balance of high voice quality, low latency, and cost efficiency.
