OpenPaths is an open source model router and AI gateway. One API key and one base URL (https://openpaths.io/v1) reach language, image, video, speech, music, embedding and 3D models from many providers.

Is OpenPaths compatible with the OpenAI and Anthropic SDKs?

Yes. POST /v1/chat/completions follows the OpenAI schema and POST /v1/messages follows the Anthropic schema. Change the base URL and keep your existing code.

How does OpenPaths pricing work?

Pay as you go at the provider price with near-zero markup. Requests on your own provider keys (BYOK) are recorded at $0. See https://openpaths.io/pricing.

What does openpaths/auto do?

openpaths/auto routes each request to a suitable model automatically, with automatic fallbacks when a provider fails or rate-limits.

Is there an OpenAPI spec or MCP server?

Yes. The OpenAPI 3.1 spec is at https://openpaths.io/openapi.json, the MCP endpoint is https://openpaths.io/mcp, and llms.txt plus llms-full.txt list every model id.

Text-to-Speech API

Send text, get base64 audio back. Choose between expressive multi-speaker Gemini TTS, xAI voices and open-source CosyVoice, all billed per character or minute.

Text to Speech models and pricing

Model	Provider	Context	Price
Gemini 3.1 Flash TTS Preview `gemini-3.1-flash-tts-preview`	Google	Jan 2025 cutoff	$1.20 in / $24.00 out per 1M tokens
AppNZ CosyVoice 3 `appnz-tts`	AppNZ	15K chars	$10.00 / 1M chars
xAI Text to Speech `xai-tts`	xAI	15K chars	$15.00 / 1M chars

FAQ

What does the response look like?

JSON with a base64 audio field and a format field. Decode it and write it to a file, or play it from a data URL.

How do I get an API key?

Create an account and your first key is issued immediately. The same key works for every model and endpoint on OpenPaths.

How is it priced?

Prepaid, pay-as-you-go credits at close to provider list price with no subscription. The tables on this page are generated from the live OpenPaths model catalog.

Speech to Text Music Generation Chat Completions