# TTS-1 HD

> TTS-1 HD is a proprietary speech model from OpenAI, released on 6 Nov 2023. It accepts text and generates audio.

Source page: https://www.aimodel.directory/models/tts-1-hd
Last verified: 21 Oct 2026

## Specifications

- **Developer:** OpenAI
- **Release date:** 6 Nov 2023 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/tts-1-hd.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/tts-1-hd.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/tts-1-hd.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/tts-1-hd.toml)
- **Output:** Audio (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/tts-1-hd.toml)
- **Reasoning mode:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/tts-1-hd.toml)
- **Tool calling:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/openai/tts-1-hd.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| Vercel AI Gateway | – | – | – | – |

## FAQ

### Is TTS-1 HD open source?

No. TTS-1 HD is a proprietary model; OpenAI has not released its weights. It is available through APIs including Vercel AI Gateway.

### When was TTS-1 HD released?

OpenAI released TTS-1 HD on 6 Nov 2023, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "TTS-1 HD", https://www.aimodel.directory/models/tts-1-hd