> 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 transcription POST https://openrouter.ai/api/v1/audio/transcriptions Content-Type: application/json Transcribes audio into text. Accepts base64-encoded audio input and returns the transcribed text. Reference: https://openrouter.ai/docs/api/api-reference/transcriptions/create-audio-transcriptions ## OpenAPI Specification ```yaml openapi: 3.1.0 info: title: OpenRouter API version: 1.0.0 paths: /audio/transcriptions: post: operationId: create-audio-transcriptions summary: Create transcription description: >- Transcribes audio into text. Accepts base64-encoded audio input and returns the transcribed text. tags: - subpackage_stt parameters: - name: Authorization in: header description: API key as bearer token in Authorization header required: true schema: type: string responses: '200': description: Transcription result content: application/json: schema: $ref: '#/components/schemas/STTResponse' '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/STTRequest' servers: - url: https://openrouter.ai/api/v1 components: schemas: STTInputAudio: type: object properties: data: type: string description: Base64-encoded audio data (raw bytes, not a data URI) format: type: string description: >- Audio format (e.g., wav, mp3, flac, m4a, ogg, webm, aac). Supported formats vary by provider. required: - data - format description: Base64-encoded audio to transcribe title: STTInputAudio 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 SttRequestProvider: type: object properties: options: $ref: '#/components/schemas/ProviderOptions' description: Provider-specific passthrough configuration title: SttRequestProvider STTRequest: type: object properties: input_audio: $ref: '#/components/schemas/STTInputAudio' language: type: string description: >- ISO-639-1 language code (e.g., "en", "ja"). Auto-detected if omitted. model: type: string description: STT model identifier provider: $ref: '#/components/schemas/SttRequestProvider' description: Provider-specific passthrough configuration temperature: type: number format: double description: Sampling temperature for transcription required: - input_audio - model description: >- Speech-to-text request input. Accepts a JSON body with input_audio containing base64-encoded audio. title: STTRequest STTUsage: type: object properties: cost: type: number format: double description: Total cost of the request in USD input_tokens: type: integer description: Number of input tokens billed for this request output_tokens: type: integer description: Number of output tokens generated seconds: type: number format: double description: Duration of the input audio in seconds total_tokens: type: integer description: Total number of tokens used (input + output) description: Aggregated usage statistics for the request title: STTUsage STTResponse: type: object properties: text: type: string description: The transcribed text usage: $ref: '#/components/schemas/STTUsage' required: - text description: STT response containing transcribed text and optional usage statistics title: STTResponse 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 STT_createAudioTranscriptions_example import requests url = "https://openrouter.ai/api/v1/audio/transcriptions" payload = { "input_audio": { "data": "UklGRiQA...", "format": "wav" }, "model": "openai/whisper-large-v3", "language": "en" } headers = { "Authorization": "Bearer ", "Content-Type": "application/json" } response = requests.post(url, json=payload, headers=headers) print(response.json()) ``` ```javascript STT_createAudioTranscriptions_example const url = 'https://openrouter.ai/api/v1/audio/transcriptions'; const options = { method: 'POST', headers: {Authorization: 'Bearer ', 'Content-Type': 'application/json'}, body: '{"input_audio":{"data":"UklGRiQA...","format":"wav"},"model":"openai/whisper-large-v3","language":"en"}' }; try { const response = await fetch(url, options); const data = await response.json(); console.log(data); } catch (error) { console.error(error); } ``` ```go STT_createAudioTranscriptions_example package main import ( "fmt" "strings" "net/http" "io" ) func main() { url := "https://openrouter.ai/api/v1/audio/transcriptions" payload := strings.NewReader("{\n \"input_audio\": {\n \"data\": \"UklGRiQA...\",\n \"format\": \"wav\"\n },\n \"model\": \"openai/whisper-large-v3\",\n \"language\": \"en\"\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 STT_createAudioTranscriptions_example require 'uri' require 'net/http' url = URI("https://openrouter.ai/api/v1/audio/transcriptions") 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_audio\": {\n \"data\": \"UklGRiQA...\",\n \"format\": \"wav\"\n },\n \"model\": \"openai/whisper-large-v3\",\n \"language\": \"en\"\n}" response = http.request(request) puts response.read_body ``` ```java STT_createAudioTranscriptions_example import com.mashape.unirest.http.HttpResponse; import com.mashape.unirest.http.Unirest; HttpResponse response = Unirest.post("https://openrouter.ai/api/v1/audio/transcriptions") .header("Authorization", "Bearer ") .header("Content-Type", "application/json") .body("{\n \"input_audio\": {\n \"data\": \"UklGRiQA...\",\n \"format\": \"wav\"\n },\n \"model\": \"openai/whisper-large-v3\",\n \"language\": \"en\"\n}") .asString(); ``` ```php STT_createAudioTranscriptions_example request('POST', 'https://openrouter.ai/api/v1/audio/transcriptions', [ 'body' => '{ "input_audio": { "data": "UklGRiQA...", "format": "wav" }, "model": "openai/whisper-large-v3", "language": "en" }', 'headers' => [ 'Authorization' => 'Bearer ', 'Content-Type' => 'application/json', ], ]); echo $response->getBody(); ``` ```csharp STT_createAudioTranscriptions_example using RestSharp; var client = new RestClient("https://openrouter.ai/api/v1/audio/transcriptions"); var request = new RestRequest(Method.POST); request.AddHeader("Authorization", "Bearer "); request.AddHeader("Content-Type", "application/json"); request.AddParameter("application/json", "{\n \"input_audio\": {\n \"data\": \"UklGRiQA...\",\n \"format\": \"wav\"\n },\n \"model\": \"openai/whisper-large-v3\",\n \"language\": \"en\"\n}", ParameterType.RequestBody); IRestResponse response = client.Execute(request); ``` ```swift STT_createAudioTranscriptions_example import Foundation let headers = [ "Authorization": "Bearer ", "Content-Type": "application/json" ] let parameters = [ "input_audio": [ "data": "UklGRiQA...", "format": "wav" ], "model": "openai/whisper-large-v3", "language": "en" ] as [String : Any] let postData = JSONSerialization.data(withJSONObject: parameters, options: []) let request = NSMutableURLRequest(url: NSURL(string: "https://openrouter.ai/api/v1/audio/transcriptions")! 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() ```