> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://openrouter.ai/docs/llms.txt. > For full documentation content, see https://openrouter.ai/docs/llms-full.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://openrouter.ai/docs/_mcp/server. # Create speech POST https://openrouter.ai/api/v1/audio/speech Content-Type: application/json Synthesizes audio from the input text. Returns a raw audio bytestream in the requested format (e.g. mp3, pcm, wav). Reference: https://openrouter.ai/docs/api/api-reference/speech/create-audio-speech ## OpenAPI Specification ```yaml openapi: 3.1.0 info: title: OpenRouter API version: 1.0.0 paths: /audio/speech: post: operationId: create-audio-speech summary: Create speech description: >- Synthesizes audio from the input text. Returns a raw audio bytestream in the requested format (e.g. mp3, pcm, wav). tags: - subpackage_tts parameters: - name: Authorization in: header description: API key as bearer token in Authorization header required: true schema: type: string responses: '200': description: Audio bytes stream content: application/octet-stream: schema: type: string format: binary '400': description: Bad Request - Invalid request parameters or malformed input content: application/json: schema: $ref: '#/components/schemas/BadRequestResponse' '401': description: Unauthorized - Authentication required or invalid credentials content: application/json: schema: $ref: '#/components/schemas/UnauthorizedResponse' '402': description: Payment Required - Insufficient credits or quota to complete request content: application/json: schema: $ref: '#/components/schemas/PaymentRequiredResponse' '404': description: Not Found - Resource does not exist content: application/json: schema: $ref: '#/components/schemas/NotFoundResponse' '429': description: Too Many Requests - Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/TooManyRequestsResponse' '500': description: Internal Server Error - Unexpected server error content: application/json: schema: $ref: '#/components/schemas/InternalServerResponse' '502': description: Bad Gateway - Provider/upstream API failure content: application/json: schema: $ref: '#/components/schemas/BadGatewayResponse' '503': description: Service Unavailable - Service temporarily unavailable content: application/json: schema: $ref: '#/components/schemas/ServiceUnavailableResponse' requestBody: content: application/json: schema: $ref: '#/components/schemas/SpeechRequest' servers: - url: https://openrouter.ai/api/v1 components: schemas: ProviderOptions: type: object properties: 01ai: type: object additionalProperties: description: Any type ai21: type: object additionalProperties: description: Any type aion-labs: type: object additionalProperties: description: Any type akashml: type: object additionalProperties: description: Any type alibaba: type: object additionalProperties: description: Any type amazon-bedrock: type: object additionalProperties: description: Any type amazon-nova: type: object additionalProperties: description: Any type ambient: type: object additionalProperties: description: Any type anthropic: type: object additionalProperties: description: Any type anyscale: type: object additionalProperties: description: Any type arcee-ai: type: object additionalProperties: description: Any type atlas-cloud: type: object additionalProperties: description: Any type atoma: type: object additionalProperties: description: Any type avian: type: object additionalProperties: description: Any type azure: type: object additionalProperties: description: Any type baidu: type: object additionalProperties: description: Any type baseten: type: object additionalProperties: description: Any type black-forest-labs: type: object additionalProperties: description: Any type byteplus: type: object additionalProperties: description: Any type centml: type: object additionalProperties: description: Any type cerebras: type: object additionalProperties: description: Any type chutes: type: object additionalProperties: description: Any type cirrascale: type: object additionalProperties: description: Any type clarifai: type: object additionalProperties: description: Any type cloudflare: type: object additionalProperties: description: Any type cohere: type: object additionalProperties: description: Any type crofai: type: object additionalProperties: description: Any type crucible: type: object additionalProperties: description: Any type crusoe: type: object additionalProperties: description: Any type darkbloom: type: object additionalProperties: description: Any type deepinfra: type: object additionalProperties: description: Any type deepseek: type: object additionalProperties: description: Any type dekallm: type: object additionalProperties: description: Any type digitalocean: type: object additionalProperties: description: Any type enfer: type: object additionalProperties: description: Any type fake-provider: type: object additionalProperties: description: Any type featherless: type: object additionalProperties: description: Any type fireworks: type: object additionalProperties: description: Any type friendli: type: object additionalProperties: description: Any type gmicloud: type: object additionalProperties: description: Any type google-ai-studio: type: object additionalProperties: description: Any type google-vertex: type: object additionalProperties: description: Any type gopomelo: type: object additionalProperties: description: Any type groq: type: object additionalProperties: description: Any type huggingface: type: object additionalProperties: description: Any type hyperbolic: type: object additionalProperties: description: Any type hyperbolic-quantized: type: object additionalProperties: description: Any type inception: type: object additionalProperties: description: Any type inceptron: type: object additionalProperties: description: Any type inference-net: type: object additionalProperties: description: Any type infermatic: type: object additionalProperties: description: Any type inflection: type: object additionalProperties: description: Any type inocloud: type: object additionalProperties: description: Any type io-net: type: object additionalProperties: description: Any type ionstream: type: object additionalProperties: description: Any type klusterai: type: object additionalProperties: description: Any type lambda: type: object additionalProperties: description: Any type lepton: type: object additionalProperties: description: Any type liquid: type: object additionalProperties: description: Any type lynn: type: object additionalProperties: description: Any type lynn-private: type: object additionalProperties: description: Any type mancer: type: object additionalProperties: description: Any type mancer-old: type: object additionalProperties: description: Any type mara: type: object additionalProperties: description: Any type meta: type: object additionalProperties: description: Any type minimax: type: object additionalProperties: description: Any type mistral: type: object additionalProperties: description: Any type modal: type: object additionalProperties: description: Any type modelrun: type: object additionalProperties: description: Any type modular: type: object additionalProperties: description: Any type moonshotai: type: object additionalProperties: description: Any type morph: type: object additionalProperties: description: Any type ncompass: type: object additionalProperties: description: Any type nebius: type: object additionalProperties: description: Any type nex-agi: type: object additionalProperties: description: Any type nextbit: type: object additionalProperties: description: Any type nineteen: type: object additionalProperties: description: Any type novita: type: object additionalProperties: description: Any type nvidia: type: object additionalProperties: description: Any type octoai: type: object additionalProperties: description: Any type open-inference: type: object additionalProperties: description: Any type openai: type: object additionalProperties: description: Any type parasail: type: object additionalProperties: description: Any type perceptron: type: object additionalProperties: description: Any type perplexity: type: object additionalProperties: description: Any type phala: type: object additionalProperties: description: Any type poolside: type: object additionalProperties: description: Any type recraft: type: object additionalProperties: description: Any type recursal: type: object additionalProperties: description: Any type reflection: type: object additionalProperties: description: Any type reka: type: object additionalProperties: description: Any type relace: type: object additionalProperties: description: Any type replicate: type: object additionalProperties: description: Any type sambanova: type: object additionalProperties: description: Any type sambanova-cloaked: type: object additionalProperties: description: Any type seed: type: object additionalProperties: description: Any type sf-compute: type: object additionalProperties: description: Any type siliconflow: type: object additionalProperties: description: Any type sourceful: type: object additionalProperties: description: Any type stealth: type: object additionalProperties: description: Any type stepfun: type: object additionalProperties: description: Any type streamlake: type: object additionalProperties: description: Any type switchpoint: type: object additionalProperties: description: Any type targon: type: object additionalProperties: description: Any type together: type: object additionalProperties: description: Any type together-lite: type: object additionalProperties: description: Any type ubicloud: type: object additionalProperties: description: Any type upstage: type: object additionalProperties: description: Any type venice: type: object additionalProperties: description: Any type wandb: type: object additionalProperties: description: Any type xai: type: object additionalProperties: description: Any type xiaomi: type: object additionalProperties: description: Any type z-ai: type: object additionalProperties: description: Any type description: >- Provider-specific options keyed by provider slug. The options for the matched provider are spread into the upstream request body. title: ProviderOptions SpeechRequestProvider: type: object properties: options: $ref: '#/components/schemas/ProviderOptions' description: Provider-specific passthrough configuration title: SpeechRequestProvider SpeechRequestResponseFormat: type: string enum: - mp3 - pcm default: pcm description: Audio output format title: SpeechRequestResponseFormat SpeechRequest: type: object properties: input: type: string description: Text to synthesize model: type: string description: TTS model identifier provider: $ref: '#/components/schemas/SpeechRequestProvider' description: Provider-specific passthrough configuration response_format: $ref: '#/components/schemas/SpeechRequestResponseFormat' description: Audio output format speed: type: number format: double description: >- Playback speed multiplier. Only used by models that support it (e.g. OpenAI TTS). Ignored by other providers. voice: type: string description: Voice identifier (provider-specific). required: - input - model - voice description: Text-to-speech request input title: SpeechRequest BadRequestResponseErrorData: type: object properties: code: type: integer message: type: string metadata: type: - object - 'null' additionalProperties: description: Any type required: - code - message description: Error data for BadRequestResponse title: BadRequestResponseErrorData BadRequestResponse: type: object properties: error: $ref: '#/components/schemas/BadRequestResponseErrorData' openrouter_metadata: type: - object - 'null' additionalProperties: description: Any type user_id: type: - string - 'null' required: - error description: Bad Request - Invalid request parameters or malformed input title: BadRequestResponse UnauthorizedResponseErrorData: type: object properties: code: type: integer message: type: string metadata: type: - object - 'null' additionalProperties: description: Any type required: - code - message description: Error data for UnauthorizedResponse title: UnauthorizedResponseErrorData UnauthorizedResponse: type: object properties: error: $ref: '#/components/schemas/UnauthorizedResponseErrorData' openrouter_metadata: type: - object - 'null' additionalProperties: description: Any type user_id: type: - string - 'null' required: - error description: Unauthorized - Authentication required or invalid credentials title: UnauthorizedResponse PaymentRequiredResponseErrorData: type: object properties: code: type: integer message: type: string metadata: type: - object - 'null' additionalProperties: description: Any type required: - code - message description: Error data for PaymentRequiredResponse title: PaymentRequiredResponseErrorData PaymentRequiredResponse: type: object properties: error: $ref: '#/components/schemas/PaymentRequiredResponseErrorData' openrouter_metadata: type: - object - 'null' additionalProperties: description: Any type user_id: type: - string - 'null' required: - error description: Payment Required - Insufficient credits or quota to complete request title: PaymentRequiredResponse NotFoundResponseErrorData: type: object properties: code: type: integer message: type: string metadata: type: - object - 'null' additionalProperties: description: Any type required: - code - message description: Error data for NotFoundResponse title: NotFoundResponseErrorData NotFoundResponse: type: object properties: error: $ref: '#/components/schemas/NotFoundResponseErrorData' openrouter_metadata: type: - object - 'null' additionalProperties: description: Any type user_id: type: - string - 'null' required: - error description: Not Found - Resource does not exist title: NotFoundResponse TooManyRequestsResponseErrorData: type: object properties: code: type: integer message: type: string metadata: type: - object - 'null' additionalProperties: description: Any type required: - code - message description: Error data for TooManyRequestsResponse title: TooManyRequestsResponseErrorData TooManyRequestsResponse: type: object properties: error: $ref: '#/components/schemas/TooManyRequestsResponseErrorData' openrouter_metadata: type: - object - 'null' additionalProperties: description: Any type user_id: type: - string - 'null' required: - error description: Too Many Requests - Rate limit exceeded title: TooManyRequestsResponse InternalServerResponseErrorData: type: object properties: code: type: integer message: type: string metadata: type: - object - 'null' additionalProperties: description: Any type required: - code - message description: Error data for InternalServerResponse title: InternalServerResponseErrorData InternalServerResponse: type: object properties: error: $ref: '#/components/schemas/InternalServerResponseErrorData' openrouter_metadata: type: - object - 'null' additionalProperties: description: Any type user_id: type: - string - 'null' required: - error description: Internal Server Error - Unexpected server error title: InternalServerResponse BadGatewayResponseErrorData: type: object properties: code: type: integer message: type: string metadata: type: - object - 'null' additionalProperties: description: Any type required: - code - message description: Error data for BadGatewayResponse title: BadGatewayResponseErrorData BadGatewayResponse: type: object properties: error: $ref: '#/components/schemas/BadGatewayResponseErrorData' openrouter_metadata: type: - object - 'null' additionalProperties: description: Any type user_id: type: - string - 'null' required: - error description: Bad Gateway - Provider/upstream API failure title: BadGatewayResponse ServiceUnavailableResponseErrorData: type: object properties: code: type: integer message: type: string metadata: type: - object - 'null' additionalProperties: description: Any type required: - code - message description: Error data for ServiceUnavailableResponse title: ServiceUnavailableResponseErrorData ServiceUnavailableResponse: type: object properties: error: $ref: '#/components/schemas/ServiceUnavailableResponseErrorData' openrouter_metadata: type: - object - 'null' additionalProperties: description: Any type user_id: type: - string - 'null' required: - error description: Service Unavailable - Service temporarily unavailable title: ServiceUnavailableResponse securitySchemes: apiKey: type: http scheme: bearer description: API key as bearer token in Authorization header ``` ## SDK Code Examples ```python import requests url = "https://openrouter.ai/api/v1/audio/speech" payload = { "input": "Hello world", "model": "elevenlabs/eleven-turbo-v2", "voice": "alloy", "response_format": "pcm", "speed": 1 } headers = { "Authorization": "Bearer ", "Content-Type": "application/json" } response = requests.post(url, json=payload, headers=headers) print(response.json()) ``` ```javascript const url = 'https://openrouter.ai/api/v1/audio/speech'; const options = { method: 'POST', headers: {Authorization: 'Bearer ', 'Content-Type': 'application/json'}, body: '{"input":"Hello world","model":"elevenlabs/eleven-turbo-v2","voice":"alloy","response_format":"pcm","speed":1}' }; try { const response = await fetch(url, options); const data = await response.json(); console.log(data); } catch (error) { console.error(error); } ``` ```go package main import ( "fmt" "strings" "net/http" "io" ) func main() { url := "https://openrouter.ai/api/v1/audio/speech" payload := strings.NewReader("{\n \"input\": \"Hello world\",\n \"model\": \"elevenlabs/eleven-turbo-v2\",\n \"voice\": \"alloy\",\n \"response_format\": \"pcm\",\n \"speed\": 1\n}") req, _ := http.NewRequest("POST", url, payload) req.Header.Add("Authorization", "Bearer ") req.Header.Add("Content-Type", "application/json") res, _ := http.DefaultClient.Do(req) defer res.Body.Close() body, _ := io.ReadAll(res.Body) fmt.Println(res) fmt.Println(string(body)) } ``` ```ruby require 'uri' require 'net/http' url = URI("https://openrouter.ai/api/v1/audio/speech") http = Net::HTTP.new(url.host, url.port) http.use_ssl = true request = Net::HTTP::Post.new(url) request["Authorization"] = 'Bearer ' request["Content-Type"] = 'application/json' request.body = "{\n \"input\": \"Hello world\",\n \"model\": \"elevenlabs/eleven-turbo-v2\",\n \"voice\": \"alloy\",\n \"response_format\": \"pcm\",\n \"speed\": 1\n}" response = http.request(request) puts response.read_body ``` ```java import com.mashape.unirest.http.HttpResponse; import com.mashape.unirest.http.Unirest; HttpResponse response = Unirest.post("https://openrouter.ai/api/v1/audio/speech") .header("Authorization", "Bearer ") .header("Content-Type", "application/json") .body("{\n \"input\": \"Hello world\",\n \"model\": \"elevenlabs/eleven-turbo-v2\",\n \"voice\": \"alloy\",\n \"response_format\": \"pcm\",\n \"speed\": 1\n}") .asString(); ``` ```php request('POST', 'https://openrouter.ai/api/v1/audio/speech', [ 'body' => '{ "input": "Hello world", "model": "elevenlabs/eleven-turbo-v2", "voice": "alloy", "response_format": "pcm", "speed": 1 }', 'headers' => [ 'Authorization' => 'Bearer ', 'Content-Type' => 'application/json', ], ]); echo $response->getBody(); ``` ```csharp using RestSharp; var client = new RestClient("https://openrouter.ai/api/v1/audio/speech"); var request = new RestRequest(Method.POST); request.AddHeader("Authorization", "Bearer "); request.AddHeader("Content-Type", "application/json"); request.AddParameter("application/json", "{\n \"input\": \"Hello world\",\n \"model\": \"elevenlabs/eleven-turbo-v2\",\n \"voice\": \"alloy\",\n \"response_format\": \"pcm\",\n \"speed\": 1\n}", ParameterType.RequestBody); IRestResponse response = client.Execute(request); ``` ```swift import Foundation let headers = [ "Authorization": "Bearer ", "Content-Type": "application/json" ] let parameters = [ "input": "Hello world", "model": "elevenlabs/eleven-turbo-v2", "voice": "alloy", "response_format": "pcm", "speed": 1 ] as [String : Any] let postData = JSONSerialization.data(withJSONObject: parameters, options: []) let request = NSMutableURLRequest(url: NSURL(string: "https://openrouter.ai/api/v1/audio/speech")! as URL, cachePolicy: .useProtocolCachePolicy, timeoutInterval: 10.0) request.httpMethod = "POST" request.allHTTPHeaderFields = headers request.httpBody = postData as Data let session = URLSession.shared let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in if (error != nil) { print(error as Any) } else { let httpResponse = response as? HTTPURLResponse print(httpResponse) } }) dataTask.resume() ```