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Fish Audio · Voice model

S1

fish-audio/s1
  • Voice
Released Jul 29, 2026

S1 is a multilingual text-to-speech model from Fish Audio. It is suited for voice applications that need broad emotional expression, using parenthetical controls to guide speaking style across its supported...

Specifications

Input
text, up to 20,000 characters per call
Output
mp3 (default) or raw pcm
Voice
provider voice ids via `voice`; omitted = the provider's default when it has one
Billing
per character of input text

Use it

POST /api/v1/audio/speech · MCP speak · full reference

curl https://omnirail.org/api/v1/audio/speech \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"fish-audio/s1","input":"Hello from OmniRail. Every model, one key.","response_format":"mp3"}' \
  --output hello.mp3