What is voice AI?
AI systems that generate or understand human speech in real time.
Voice AI refers to systems that synthesize natural-sounding speech (TTS — text-to-speech) and understand human speech (ASR — automatic speech recognition) in real time. Modern voice-AI providers (Cartesia, ElevenLabs, OpenAI Realtime API, Anthropic Voice) operate at sub-second latency, making conversational AI receptionists and phone agents finally indistinguishable from human voices. The voice-AI category split in 2025: pre-Cartesia models that callers identify as robots within 5 seconds, and modern sub-second models that pass live A/B tests. PYREXA uses Cartesia tuned over 19 iterations of prompt + voice configuration.
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