How We Built Voice Messages for AI Companions: Real Voice Audio, ElevenLabs, and Beyond

Adding voice messages to an AI companion is one of those features that sounds simple until you try to ship it. "Just use a TTS API and send the audio" -sure, in theory. In practice, you are solving latency, character consistency, emotional expressiveness, and cost optimization all at once. Here is how voice synthesis works in production for AI companions, based on what I have learned building and studying these systems. The TTS landscape in 2026 The text-to-speech market has fragmented into two