Deepgram
Real-time speech-to-text API with sub-300ms latency
Verdict
Fastest production ASR API — under 300ms latency for real-time use. Nova-3 model improved on Nova-2 with multilingual code-switching (handling a language switch mid-sentence). Best for live transcription, call centres, and real-time applications.
Other Speech & Audio
- GPT-4o TranscribeProduction
OpenAI's hosted speech-to-text model — more accurate than Whisper via the API
- Whisper Large V3Production
OpenAI's open-source speech recognition model — still the gold standard for self-hosted ASR
- ElevenLabsProduction
Best-in-class text-to-speech with voice cloning and dubbing
- OpenAI TTSProduction
OpenAI's simple API for high-quality speech synthesis
- AssemblyAIProduction
Transcription API with built-in audio intelligence features
- Suno v4.5Stable
AI music generation from text prompts with full song structure