TTS-1 / TTS-1 HD
Not deprecated as of 2026-09-29 but no longer shown in the models overview; gpt-4o-mini-tts is the current, instruction-steerable replacement. Release date = OpenAI DevDay 2023 (from memory, not re-verified today).
- Input
- text
- Output
- audio
- License
- proprietary
- Pricing
- per 1m characters: $15 (USD per 1M characters for tts-1; tts-1-hd $30 per 1M characters) source
- Verified
- 2026-09-29
How to call it
| Provider | Model id | Endpoint / URL | Docs |
|---|---|---|---|
| OpenAI API | tts-1 | https://api.openai.com/v1/audio/speech | docs |
| OpenAI API | tts-1-hd | https://api.openai.com/v1/audio/speech | docs |
Notable capabilities (1)
- Low-latency preset-voice TTS: tts-1 optimised for real-time synthesis; tts-1-hd for higher quality at twice the price. source
Sources:
Other OpenAI models
GPT-6 Luna · GPT-6 Sol · GPT Image 2.5 Flare · GPT Image 2.5 Sunburst · GPT-6 Astra · GPT-Live-Transcribe · GPT-Transcribe · GPT-5.6 Terra · GPT-Live 1 · GPT-Realtime-2.1 · GPT-Realtime-2 · GPT-Realtime-Translate · GPT-Rosalind · GPT-Audio-1.5 (and gpt-audio / gpt-audio-mini) · GPT-5.3-Codex · gpt-oss-120b · gpt-oss-20b · GPT-4o mini TTS · text-embedding-3-large · text-embedding-3-small · GPT-5.6 Luna · GPT-5.6 Sol · GPT-Realtime-Whisper · GPT-5.5 Pro · GPT-5.5 · GPT Image 2 · GPT-5.4 · GPT-Realtime-1.5 · GPT-4.1 · GPT-4o · Whisper large-v3 / large-v3-turbo (open weights) · GPT-Realtime and GPT-Realtime mini · o3 · GPT-4o Transcribe / Mini Transcribe / Transcribe Diarize · Whisper (whisper-1 API) · Sora 2