# Grok TTS

> Grok TTS is a proprietary speech model from xAI, released on 16 Mar 2026. It accepts text and generates audio, with a 15K-token context window and up to 15K output tokens per response.

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

## Specifications

- **Developer:** xAI
- **Release date:** 16 Mar 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)
- **Context window:** 15K (15,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)
- **Max output:** 15K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)
- **Output:** Audio (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)
- **Reasoning mode:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)
- **Tool calling:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/vercel/models/spacexai/grok-tts.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| Vercel AI Gateway | – | – | – | 15K |

## FAQ

### What is the context window of Grok TTS?

Grok TTS has a context window of 15,000 tokens (15K) and can generate up to 15,000 tokens in a single response, according to models.dev.

### Is Grok TTS open source?

No. Grok TTS is a proprietary model; xAI has not released its weights. It is available through APIs including Vercel AI Gateway.

### When was Grok TTS released?

xAI released Grok TTS on 16 Mar 2026, according to models.dev.

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