API Reference
Synthorai exposes a multi-protocol REST API over HTTPS. The same base URL, key, and billing serve three request shapes — OpenAI Chat Completions, OpenAI Responses, and Anthropic Messages — plus auxiliary endpoints for embeddings, images, audio, and reranking.
Base URL: https://synthorai.io/v1
All endpoints require:
Content-Type: application/json
Authorization: Bearer <your-api-key>
(or x-api-key: <your-api-key> for /v1/messages)Endpoints
| Endpoint | Type | Description |
|---|---|---|
POST /v1/chat/completions | chat | OpenAI Chat Completions — universal entry point, routes to any provider. |
POST /v1/responses | chat | OpenAI Responses — tool use, reasoning, structured output. |
POST /v1/messages | chat | Anthropic Messages — Claude / Bedrock-Anthropic native. |
POST /v1/embeddings | embedding | Generate vector embeddings. |
POST /v1/images/generations | image | Generate images from text prompts. |
POST /v1/videos | video | Create and poll asynchronous video generation jobs. |
POST /v1/audio/transcriptions | audio | Transcribe audio to text. |
POST /v1/audio/speech | audio | Convert text to speech. |
POST /v1/rerank | rerank | Rerank documents against a query. |
GET /v1/models | read | List all models available to the authenticated key. |
Every endpoint bills against the same per-token catalog — see the model price comparison for what each routable model costs.