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Voice AI is not back because people suddenly love talking to gadgets. It is back because the models finally changed — GPT-4o responds in 232ms (17x faster than GPT-4), Gemini 2.5 Native Audio hits 200ms first-byte, and Cartesia Sonic Turbo reaches 40ms. Native audio processing, persistent context, and function calling have replaced the old ASR-NLU-TTS pipeline that made every voice assistant feel like a command-line interface you spoke at.