> ## Documentation Index > Fetch the complete documentation index at: https://docs.opper.ai/llms.txt > Use this file to discover all available pages before exploring further. # Responses > OpenAI Responses API compatible endpoint. Supports streaming via the stream parameter. ## OpenAPI ````yaml post /v3/compat/responses openapi: 3.1.0 info: description: Schema-driven generative API that orchestrates LLM-powered workflows. title: Task API version: 3.0.0 servers: - description: Production url: https://api.opper.ai - description: Local development url: http://localhost:8080 security: - BearerAuth: [] tags: - description: Schema-driven function management and execution name: Functions - description: OpenAI-compatible chat completions name: Chat - description: OpenAI Responses API compatible endpoint name: Responses - description: Google-compatible interactions endpoint name: Interactions - description: Model registry and capabilities name: Models - description: Synchronous image generation name: Images - description: Text-to-speech and speech-to-text name: Audio - description: Asynchronous video generation name: Videos - description: Reusable file storage for media inputs and generated outputs name: Files - description: Async generation status and downloads name: Artifacts - description: OpenAI-compatible embeddings name: Embeddings - description: Recorded HTTP request/response generations name: Generations - description: System health and status name: System - description: Roundtable endpoint — fan out a query to multiple LLMs and combine results name: Roundtable - description: Web search, fetch, and other utility tools name: Tools paths: /v3/compat/responses: post: tags: - Compatibility summary: Responses API description: >- OpenAI Responses API compatible endpoint. Supports streaming via the stream parameter. operationId: createResponse parameters: - description: >- Function name for tracing and project-level guardrail function-scope filtering. in: header name: X-Opper-Name schema: type: string - description: Parent span ID for distributed tracing context. in: header name: X-Opper-Parent-Span-Id schema: format: uuid type: string requestBody: content: application/json: schema: $ref: '#/components/schemas/ResponsesRequest' required: true responses: '200': content: application/json: schema: $ref: '#/components/schemas/ResponsesResponse' text/event-stream: schema: description: >- Server-Sent Events stream following the OpenAI Responses streaming protocol. Each event has an `event:` line and a `data: ` line. The stream terminates with a `response.completed` event whose payload carries the final `usage` (token counts and Opper `cost` extension). type: string description: Successful response headers: X-Opper-Cost: description: Execution cost of the request as a floating-point number. schema: format: double type: number '400': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' description: Bad request '401': description: Unauthorized - missing or invalid API key '500': content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' description: Internal server error components: schemas: ResponsesRequest: properties: frequency_penalty: type: number include: items: type: string type: array input: properties: Items: items: properties: type: type: string required: - type type: object type: array Text: type: string required: - Text - Items type: object instructions: type: string max_output_tokens: type: integer metadata: type: object model: type: string parallel_tool_calls: type: boolean presence_penalty: type: number previous_response_id: type: string reasoning: properties: effort: type: string summary: type: string type: object service_tier: type: string store: type: boolean stream: type: boolean temperature: type: number text: properties: format: properties: name: type: string schema: type: object type: type: string required: - type type: object type: object tool_choice: description: Any value tools: items: properties: description: type: string headers: additionalProperties: type: string type: object name: type: string parameters: type: object require_approval: type: string server_label: type: string server_url: type: string type: type: string required: - type type: object type: array top_p: type: number truncation: type: string user: type: string type: object ResponsesResponse: properties: completed_at: type: integer cost: type: number created_at: type: number error: properties: code: type: string message: type: string required: - code - message type: object frequency_penalty: type: number id: type: string incomplete_details: description: Any value instructions: type: string max_output_tokens: type: integer metadata: type: object model: type: string object: type: string output: items: properties: arguments: type: string call_id: type: string content: items: properties: annotations: items: description: Any value type: array text: type: string type: type: string required: - type - text type: object type: array encrypted_content: type: string id: type: string name: type: string role: type: string status: type: string summary: items: properties: text: type: string type: type: string required: - type - text type: object type: array type: type: string required: - type type: object type: array output_text: type: string parallel_tool_calls: type: boolean presence_penalty: type: number previous_response_id: type: string reasoning: properties: effort: type: string summary: type: string type: object service_tier: type: string status: type: string temperature: type: number text: properties: format: properties: name: type: string schema: type: object type: type: string required: - type type: object type: object tool_choice: description: Any value tools: items: properties: description: type: string headers: additionalProperties: type: string type: object name: type: string parameters: type: object require_approval: type: string server_label: type: string server_url: type: string type: type: string required: - type type: object type: array top_p: type: number truncation: type: string usage: properties: cost: type: number input_tokens: type: integer input_tokens_details: properties: cached_tokens: type: integer type: object output_tokens: type: integer output_tokens_details: properties: reasoning_tokens: type: integer type: object total_tokens: type: integer required: - input_tokens - output_tokens - total_tokens type: object user: type: string required: - id - object - created_at - model - status - output - error - incomplete_details - tool_choice type: object ErrorResponse: properties: error: properties: code: type: string details: description: Any value message: type: string required: - code - message type: object meta: type: object required: - error type: object securitySchemes: BearerAuth: bearerFormat: API Key description: API key authentication. Pass your API key as a Bearer token. scheme: bearer type: http ````