Models | Smallest AI Docs

Text to Speech (TTS) Models

Latest Release Premium 44 kHz pool with improved naturalness and a curated voice catalog across American, British, and Indian accents. English + Hindi with code-switching. Same latency profile as standard Lightning v3.1; select via "model": "lightning_v3.1_pro" on the unified TTS routes.

Lightning v3.1

A 44 kHz model delivering natural, expressive, and realistic speech. Supports voice cloning with ultra-low latency. 12 languages (English, Hindi, Spanish, and 9 Indian languages).

Lightning v2 is deprecated. New integrations should use Lightning v3.1 or Lightning v3.1 Pro. The v2 endpoints remain available for existing callers but are not recommended for new work.

Speech to Text (STT) Models

Pulse Pro

Latest Release English STT tied for #2 on the public Open ASR Leaderboard (5.42% ESB avg WER). Pre-recorded HTTP only. Select via ?model=pulse-pro on POST /waves/v1/stt/.

Pulse

Low-latency multilingual speech recognition for real-time and pre-recorded transcription. Automatic language detection across 17 streaming + 26 pre-recorded languages. Select via ?model=pulse on POST /waves/v1/stt/ or WS /waves/v1/stt/live.

LLM Models

Electron

Latest Release Smallest AI’s in-house language model. OpenAI-compatible chat completions, <300 ms TTFT, 70 languages with first-class Indic support, voice-agent-optimized tool calling, and automatic prefix caching for repeated input. Select via "model": "electron" on POST /waves/v1/chat/completions.

Speech to Speech (S2S) Models

Hydra

Latest Release Smallest AI’s full-duplex speech-to-speech model. Audio in, audio out, over a single WebSocket — no STT → LLM → TTS pipeline in the middle. Phone-grade latency with built-in barge-in, six voices, tool calling. English only today. Select via ?model=hydra on WSS /waves/v1/s2s.

Click on a model name to view its detailed model card.

API language fields use ISO 639-1 language codes (2-letter).

Pricing

Our pricing model is designed to be flexible and scalable, catering to different usage needs. For detailed pricing information, please visit our pricing page or contact our sales team at support@smallest.ai.