> ## Documentation Index > Fetch the complete documentation index at: https://aisa.one/docs/llms.txt > Use this file to discover all available pages before exploring further. # Setting ‘LLM Responses ChatGPT’ Tasks > ChatGPT LLM Responses endpoint allows you to retrieve structured responses from a specific ChatGPT model, based on the input parameters. ## OpenAPI ````yaml openapi/dataforseo.json POST /dataforseo/ai_optimization/chat_gpt/llm_responses/task_post openapi: 3.0.3 info: title: DataForSEO API version: 1.0.0 description: DataForSEO API endpoints exposed through the AIsa unified gateway. servers: - url: https://api.aisa.one/apis/v1 security: - BearerAuth: [] paths: /dataforseo/ai_optimization/chat_gpt/llm_responses/task_post: post: summary: Setting ‘LLM Responses ChatGPT’ Tasks description: >- ChatGPT LLM Responses endpoint allows you to retrieve structured responses from a specific ChatGPT model, based on the input parameters. operationId: post_dataforseo_ai_optimization_chat_gpt_llm_responses_task_post requestBody: required: true content: application/json: schema: type: object properties: user_prompt: type: string description: >- prompt for the AI model required field the question or task you want to send to the AI model; you can specify up to 500 characters in the user_prompt field model_name: type: string description: >- name of the AI model required field model_nameconsists of the actual model name and version name; if the basic model name is specified, its latest version will be set by default; for example, if gpt-4.1 is specified, the gpt-4.1-2025-04-14 will be set as model_name automatically; you can receive the list of available LLM models by making a separate request to the https://api.dataforseo.com/v3/ai_optimization/chat_gpt/llm_responses/models max_output_tokens: type: integer description: >- maximum number of tokens in the AI response optional field minimum value for reasoning models (e.g., reasoning is true in the Models endpoint): 1024; minimum value for non-reasoning models: 16; maximum value: 4096; default value: 2048 temperature: type: number description: >- randomness of the AI response optional field higher values make output more diverse; lower values make output more focused; minimum value: 0 maximum value: 2 default value: 0.94 Note: not supported in reasoning models top_p: type: number description: '' system_message: type: string description: >- instructions for the AI behaviour optional field defines the AI's role, tone, or specific behavior; you can specify up to 500 characters in the system_message field message_chain: type: array items: type: string description: >- conversation history optional field array of message objects representing previous conversation turns; each object must contain role and message parameters: role string with either user or ai role; message string with message content (max 500 characters); you can specify the maximum of 10 message objects in the array; example: "message_chain": [{"role":"user","message":"Hello, what’s up?"},{"role":"ai","message":"Hello! I’m doing well, thank you. How can I assist you today?"}] postback_url: type: string description: >- URL for sending task results optional field once the task is completed, we will send a POST request with its results compressed in the gzip format to the postback_url you specified you can use the ‘$id’ string as a $id variable and ‘$tag’ as urlencoded $tag variable. We will set the necessary values before sending the request. example: http://your-server.com/postbackscript?id=$id http://your-server.com/postbackscript?id=$id&tag=$tag Note: special character in postback_url will be urlencoded; i.a., the # character will be encoded into %23learn more on our Help Center pingback_url: type: string description: >- notification URL of a completed task optional field when a task is completed we will notify you by GET request sent to the URL you have specified you can use the ‘$id’ string as a $id variable and ‘$tag’ as urlencoded $tag variable. We will set the necessary values before sending the request example: http://your-server.com/pingscript?id=$id http://your-server.com/pingscript?id=$id&tag=$tag Note: special character in pingback_url will be urlencoded; i.a., the # character will be encoded into %23learn more on our Help Center tag: type: string description: >- user-defined task identifier optional field the character limit is 255 you can use this parameter to identify the task and match it with the result you will find the specified tag value in the data array of the response required: - user_prompt - model_name responses: '200': description: Successful response content: application/json: schema: type: object properties: version: type: string description: the current version of the API status_code: type: integer description: >- general status code you can find the full list of the response codes here Note: we strongly recommend designing a necessary system for handling related exceptional or error conditions status_message: type: string description: >- general informational message you can find the full list of general informational messages here time: type: string description: execution time, seconds cost: type: number description: total tasks cost, USD tasks_count: type: integer description: the number of tasks in the tasksarray tasks_error: type: integer description: >- the number of tasks in the tasks array returned with an error tasks: type: array items: type: string description: array of tasks tasks.id: type: string description: >- unique task identifier in our system unique task identifier in the UUID format tasks.status_code: type: integer description: >- status code of the task generated by DataForSEO; can be within the following range: 10000-60000 you can find the full list of response codes here tasks.status_message: type: string description: >- informational message of the task you can find the full list of general informational messages here tasks.time: type: string description: execution time, seconds tasks.cost: type: number description: cost of the task, USD tasks.result_count: type: integer description: number of elements in the result array tasks.path: type: array items: type: string description: URL path tasks.data: type: object description: >- contains the same parameters that you specified in the POST request tasks.result: type: array items: type: string description: array of results in this case, the value will be null '400': description: Bad request '401': description: Unauthorized '429': description: Rate limit exceeded '500': description: Internal server error components: securitySchemes: BearerAuth: type: http scheme: bearer ````