> ## Documentation Index > Fetch the complete documentation index at: https://docs.anyfast.ai/llms.txt > Use this file to discover all available pages before exploring further. # deepseek-v4-pro > Creates a model response for the given chat conversation. ## OpenAPI ````yaml api-reference/model-api/deepseek/openapi/deepseek-v4-pro/openapi.yaml POST /v1/chat/completions openapi: 3.1.0 info: title: DeepSeek V4 Pro description: DeepSeek V4 Pro via Anyfast OpenAI-compatible API version: 1.0.0 servers: - url: https://www.anyfast.ai security: - bearerAuth: [] paths: /v1/chat/completions: post: summary: Chat Completion description: Creates a model response for the given chat conversation. operationId: createChatCompletionDeepseekV4Pro requestBody: required: true content: application/json: schema: type: object required: - model - messages properties: model: type: string enum: - deepseek-v4-pro description: Model ID example: deepseek-v4-pro messages: type: array minItems: 1 description: A list of messages comprising the conversation so far. items: type: object required: - role - content properties: role: type: string enum: - system - user - assistant - tool content: type: string name: type: string description: >- Participant name for distinguishing between same-role participants. prefix: type: boolean description: >- If true, the model will treat this message as a prefix to continue. tool_call_id: type: string description: >- Required for tool messages. The tool call this message responds to. example: - role: user content: Hello! thinking: type: object nullable: true description: Enable or disable thinking mode. properties: type: type: string enum: - enabled - disabled description: '`enabled` to turn on thinking mode.' reasoning_effort: type: string enum: - high - max - low - medium description: Controls reasoning effort. max_tokens: type: integer minimum: 1 description: The maximum number of tokens to generate. response_format: type: object properties: type: type: string enum: - text - json_object default: text description: 'Set to `{"type": "json_object"}` to enable JSON mode.' stop: oneOf: - type: string - type: array items: type: string description: >- Sequences where the model will stop generating further tokens. Up to 16 strings. stream: type: boolean default: false description: If true, stream partial message deltas using SSE. stream_options: type: object description: Options for streaming. Only valid when stream is true. properties: include_usage: type: boolean description: >- If true, include usage stats in the final streaming chunk. temperature: type: number minimum: 0 maximum: 2 default: 1 description: Sampling temperature. Higher values make output more random. example: 1 top_p: type: number minimum: 0 maximum: 1 default: 1 description: Nucleus sampling threshold. tools: type: array description: >- A list of tools the model may call. Currently only functions are supported. items: type: object properties: type: type: string enum: - function function: type: object required: - name properties: name: type: string description: The name of the function to call. description: type: string description: A description of what the function does. parameters: type: object description: >- The parameters the function accepts, described as a JSON Schema object. strict: type: boolean description: If true, enables strict mode for the function. tool_choice: oneOf: - type: string enum: - none - auto - required - type: object properties: type: type: string enum: - function function: type: object required: - name properties: name: type: string description: >- Controls which tool is called. `none`, `auto`, `required`, or a specific function. frequency_penalty: type: number minimum: -2 maximum: 2 default: 0 description: Deprecated by DeepSeek. Passed through but has no effect. presence_penalty: type: number minimum: -2 maximum: 2 default: 0 description: Deprecated by DeepSeek. Passed through but has no effect. user_id: type: string maxLength: 512 pattern: ^[a-zA-Z0-9\-_]+$ description: Custom user ID for content safety and KVCache isolation. responses: '200': description: Completion generated successfully content: application/json: schema: $ref: '#/components/schemas/ChatCompletion' '400': description: Invalid request content: application/json: schema: type: object properties: error: type: object properties: message: type: string type: type: string code: type: string '401': description: Unauthorized '429': description: Rate limit exceeded components: schemas: ChatCompletion: type: object properties: id: type: string example: chatcmpl-abc123 object: type: string example: chat.completion created: type: integer description: Unix timestamp model: type: string example: deepseek-v4-pro choices: type: array items: type: object properties: index: type: integer message: type: object properties: role: type: string example: assistant content: type: string nullable: true example: Hello! How can I help you today? reasoning_content: type: string nullable: true description: Reasoning content from thinking mode. tool_calls: type: array nullable: true items: type: object properties: id: type: string type: type: string enum: - function function: type: object properties: name: type: string arguments: type: string finish_reason: type: string nullable: true enum: - stop - length - content_filter - tool_calls - insufficient_system_resource - null matched_stop: type: string nullable: true usage: type: object properties: prompt_tokens: type: integer completion_tokens: type: integer total_tokens: type: integer prompt_tokens_details: type: object nullable: true properties: cached_tokens: type: integer audio_tokens: type: integer text_tokens: type: integer completion_tokens_details: type: object properties: reasoning_tokens: type: integer accepted_prediction_tokens: type: integer rejected_prediction_tokens: type: integer system_fingerprint: type: string nullable: true description: Backend configuration fingerprint. securitySchemes: bearerAuth: type: http scheme: bearer description: >- Authentication via Bearer token. Create an API Key in the Anyfast console and pass it as `Bearer YOUR_API_KEY` in the Authorization header. ````