Overview

Optimized streaming pipeline delivers ~200ms time-to-first-byte (TTFB) for real-time applications. Lightning v3.1 achieves even faster response times for conversational AI.

Create custom voice profiles by uploading audio samples. Instant voice cloning works with just a few seconds of audio, while professional voice cloning delivers studio-quality results.

Lightning v3.1 accepts 20 language codes (10 European: English, Spanish, French, German, Italian, Dutch, Swedish, Portuguese, Polish, Russian + 10 Indic: Hindi, Marathi, Gujarati, Punjabi, Bengali, Odia, Tamil, Telugu, Kannada, Malayalam). Its trained voice catalog covers 12 of these directly; the other 8 route via English or Hindi voices. Lightning v3.1 Pro covers all 31 languages with dedicated voices (adds Greek, Finnish, Norwegian + 8 Asian & Middle Eastern languages). Pass auto to route across any supported language using any English or Hindi voice. See the Lightning v3.1 and Lightning v3.1 Pro model cards for per-language voice counts.

Choose from PCM, WAV, MP3, or μ-law encoding. Configurable sample rates from 8kHz to 44kHz to match your application’s requirements.

Adjust speech rate with a simple multiplier. Slow down for clarity or speed up for faster content delivery without pitch distortion.

Define custom pronunciations for brand names, technical terms, and acronyms. Ensure consistent, accurate pronunciation across all synthesized audio.

Lightning v3.1 produces 44 kHz audio with natural prosody and expressiveness. Perfect for audiobooks, podcasts, and premium voice experiences.

Persistent connections for continuous audio streaming. Ideal for voice bots and interactive applications where latency is critical.