> ## Documentation Index
> Fetch the complete documentation index at: https://docs.slng.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Text to speech API

> How the text-to-speech reference is organized: SLNG-hosted and provider-hosted models, each documented per protocol.

Every text-to-speech model has its own route. The reference lists one page per model and protocol, generated from the gateway's OpenAPI and AsyncAPI specs.

* **SLNG hosted**: models running on SLNG infrastructure. Routes carry the `slng/` prefix, for example `/v1/tts/slng/deepgram/aura:2-en`, and can target a specific region, as described in the [regions map](/guides/regions/regions-map).
* **Third party**: models called through SLNG on the provider's infrastructure, one group per provider. Routes use the provider name, for example `/v1/tts/deepgram/aura:2`. Use the route directly, or register your own provider key with [bring your own key](/guides/models/bring-your-own-key).
* **Pronunciation dictionaries**: shared across models. The [pronunciation dictionaries guide](/guides/execution-layer/tts/pronunciation-dictionaries) covers the workflow.

Each model lists the protocols it supports: HTTP for a single request and response, WebSocket for streaming. [WebSockets vs HTTP](/guides/models/websockets-vs-http) covers the choice. Pricing, languages, and regions per model are in the [model catalog](/models/catalog/text-to-speech).