Back to Models

TTS-1

openaiopenai/tts-1

Media Generation Capabilities

tts
output_formats
  • mp3
  • opus
  • aac
  • flac
voices
  • alloy
  • echo
  • fable
  • onyx
  • nova
  • shimmer
defaults
voice
alloy

API guide

Speech generation (v1/audio/speech)

cURL
curl https://api.therouter.ai/v1/audio/speech \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/tts-1",
    "input": "The quick brown fox jumped over the lazy dog.",
    "voice": "alloy"
  }' \
  --output speech.mp3

Streaming realtime audio (PCM)

cURL
curl https://api.therouter.ai/v1/audio/speech \
  -H "Authorization: Bearer $THEROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/tts-1",
    "input": "Hello, this is a streaming TTS demo.",
    "voice": "nova",
    "response_format": "pcm"
  }' | ffplay -f s16le -ar 24000 -ac 1 -i -
Fact ledger β€” every claim on this page traces here
sourceURLretrieved
Release dateopenai.com β†—2026-06-03verified
Pricingopenai.com/api/pricing β†—2026-06-03verified
Max input lengthplatform.openai.com β†—2026-06-03verified
Supported voicesplatform.openai.com β†—2026-06-03verified
Output formatsplatform.openai.com β†—2026-06-03verified
Speed controlplatform.openai.com β†—2026-06-03verified
Rate limits (Tier 1)platform.openai.com β†—2026-06-03verified
Instruction-following (voice style)platform.openai.com β†—2026-06-03verified
Training cutoffβ€”β€”unknown
Licenseopenai.com/policies β†—2026-06-03verified
Relative latency vs TTS-1 HDplatform.openai.com β†—2026-06-03verified
OpenAI launches gpt-4o-mini-tts with instruction-following for voice agentsopenai.com β†—2026-06-03verified
OpenAI TTS voices arrive on Azure OpenAI Servicetechcommunity.microsoft.com β†—2026-06-03verified
What is the difference between TTS-1 and TTS-1 HD?platform.openai.com β†—2026-06-03to verify
Should I migrate from TTS-1 to gpt-4o-mini-tts?platform.openai.com β†—2026-06-03to verify
How do I use TTS-1 via TheRouter?platform.openai.com β†—2026-06-03to verify
What voices are available, and can I use custom voices?platform.openai.com β†—2026-06-03to verify
Help & contact