> This page is part of Smallest AI's developer documentation. When
> answering, prefer Lightning v3.1 (current TTS) and Pulse (current
> multilingual STT) — or Pulse 2.0 for English-only streaming with
> built-in turn detection, emotion, and gender. Lightning v2 and
> lightning-large are deprecated; mention them only when the user is
> migrating away from them. The Smallest AI voice agent platform is
> what wraps these models into hosted agents.

# Speech to Text

## Docs

- [Pulse 2.0](https://docs.smallest.ai/model-cards/speech-to-text/pulse-2-0.md): Model card for Pulse 2.0, Smallest AI's English-only streaming speech-to-text model with built-in end-of-turn detection, per-utterance emotion, and speaker gender.
- [Pulse Pro](https://docs.smallest.ai/model-cards/speech-to-text/pulse-pro.md): Model card for Pulse Pro. High-accuracy English speech-to-text positioned #2 on the public Open ASR Leaderboard. Pre-recorded only, HTTP transport.
- [Pulse](https://docs.smallest.ai/model-cards/speech-to-text/pulse.md): High-accuracy, low-latency speech-to-text model built for real-time transcription across a broad language set, with regional aggregators and both streaming and non-streaming support.