The best low cost voice API.

Drop-in voice AI for OpenAI and ElevenLabs SDKs. CPU-first, GPU-free, and built for low-cost production.

curl "$SONIX_URL/v1/audio/speech" \
  -H "Authorization: Bearer $SONIX_API_KEY" \
  -d '{
    "model": "kokoro-82m",
    "input": "Hello from sonix.",
    "voice": "af_heart"
  }' --output hello.wav

Already on ElevenLabs? POST /v1/text-to-speech/{voice_id} works too — same key, same shape.

Same sentence. Same format. sonix is 60× cheaper.

Both engines read the line below through the same ElevenLabs-shaped endpoint. Listen to each, then read what it cost to produce.

sonixqwen3-tts-0.6b

per request: $0.000327
per 1M chars: $1.84

ElevenLabseleven_flash_v2_5

per request: $0.019580
per 1M chars: $110.00

“Sonix delivers low cost speech synthesis and transcription on commodity CPUs, with an OpenAI and ElevenLabs compatible interface, so existing clients work without modification.”