MODELS / FISH AUDIO

S2.1 Pro

S2.1 Pro is Fish Audio's current state-of-the-art voice model — the best model we have, now available to every developer for free via API. It is a neural speech synthesis model designed for production-grade AI voice generation, with particular strengths in low-latency streaming, multilingual TTS, and voice cloning.

SPEECH
—
CONTEXT WINDOW
—
MAX OUTPUT TOKENS
$15 / 1M tokens
INPUT PRICE
—
OUTPUT PRICE
QUICKSTART

Call it in one request.

OpenAI-compatible — change the base URL, and the setup is complete.

SHELL
curl https://enterprise.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/fish-audio/s2.1-pro",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'
INPUT: textOUTPUT: audioRELEASED: 2026-07-28
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FISH AUDIO

S1

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S2 Pro

— context · $15 / 1M tokens input · — output

FISH AUDIO

Transcribe-1

— context · <$0.001 / 1M tokens input · — output