> ## Documentation Index > Fetch the complete documentation index at: https://docs.rockapi.ai/llms.txt > Use this file to discover all available pages before exploring further. # Create chat completion > Create a model response from the conversation history. This endpoint is fully compatible with the OpenAI Chat Completions specification, supporting multi-turn conversations, tool calls (function calling), vision inputs, and reasoning models. Supports both Server-Sent Events (SSE) for streaming and standard JSON for non-streaming responses. Fully compatible with the OpenAI Chat Completions API, allowing you to use existing OpenAI SDKs and tools without code changes. ## OpenAPI ````yaml /vi/api-reference/openapi.json post /v1/chat/completions openapi: 3.0.1 info: title: Rock API API mô hình AI version: 1.0.0 description: Tham chiếu API mô hình AI tương thích OpenAI cho Rock API. servers: - url: https://rockapi.ai security: - BearerAuth: [] tags: - name: List models - name: OpenAI format (Chat) - name: OpenAI format (Responses) - name: Image generation - name: Image generation/OpenAI-compatible format - name: Image generation/Qwen - name: Video generation - name: Video generation/Sora-compatible format - name: Video generation/Kling format - name: Video generation/Jimeng format - name: Claude format (Messages) - name: Gemini format - name: OpenAI format (Embeddings) - name: Text completions - name: OpenAI audio - name: Rerank - name: Moderations - name: Realtime - name: Not implemented - name: Not implemented/Fine-tunes - name: Not implemented/Files paths: /v1/chat/completions: post: tags: - OpenAI format (Chat) summary: Create chat completion description: > Create a model response from the conversation history. This endpoint is fully compatible with the OpenAI Chat Completions specification, supporting multi-turn conversations, tool calls (function calling), vision inputs, and reasoning models. Supports both Server-Sent Events (SSE) for streaming and standard JSON for non-streaming responses. Fully compatible with the OpenAI Chat Completions API, allowing you to use existing OpenAI SDKs and tools without code changes. operationId: createChatCompletion parameters: [] requestBody: content: application/json: schema: $ref: '#/components/schemas/ChatCompletionRequest' required: true responses: '200': description: Response created successfully content: application/json: schema: $ref: '#/components/schemas/ChatCompletionResponse' headers: {} '400': description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' headers: {} '429': description: Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' headers: {} deprecated: false security: - BearerAuth: [] components: schemas: ChatCompletionRequest: type: object required: - model - messages properties: model: type: string description: Model ID example: gpt-4 messages: type: array items: $ref: '#/components/schemas/Message' description: List of conversation messages temperature: type: number minimum: 0 maximum: 2 default: 1 description: Sampling temperature top_p: type: number minimum: 0 maximum: 1 default: 1 description: Nucleus sampling parameter 'n': type: integer minimum: 1 default: 1 description: Number of generations stream: type: boolean default: false description: Whether to stream the response stream_options: type: object properties: include_usage: type: boolean stop: oneOf: - type: string - type: array items: type: string description: Stop sequences max_tokens: type: integer description: Maximum generated tokens max_completion_tokens: type: integer description: Maximum completion tokens presence_penalty: type: number minimum: -2 maximum: 2 default: 0 frequency_penalty: type: number minimum: -2 maximum: 2 default: 0 logit_bias: type: object additionalProperties: type: number properties: {} user: type: string tools: type: array items: $ref: '#/components/schemas/Tool' tool_choice: oneOf: - type: string enum: - none - auto - required - type: object properties: type: type: string function: type: object properties: name: type: string response_format: $ref: '#/components/schemas/ResponseFormat' seed: type: integer reasoning_effort: type: string enum: - low - medium - high description: Reasoning effort (for models that support reasoning) modalities: type: array items: type: string enum: - text - audio audio: type: object properties: voice: type: string format: type: string ChatCompletionResponse: type: object properties: id: type: string object: type: string example: chat.completion created: type: integer model: type: string choices: type: array items: type: object properties: index: type: integer message: $ref: '#/components/schemas/Message' finish_reason: type: string enum: - stop - length - tool_calls - content_filter usage: $ref: '#/components/schemas/Usage' system_fingerprint: type: string ErrorResponse: type: object properties: error: type: object properties: message: type: string description: Error message type: type: string description: Error type param: type: string description: Related parameter nullable: true code: type: string description: Error code nullable: true Message: type: object required: - role - content properties: role: type: string enum: - system - user - assistant - tool - developer description: Message role content: oneOf: - type: string - type: array items: $ref: '#/components/schemas/MessageContent' description: Message content name: type: string description: Sender name tool_calls: type: array items: $ref: '#/components/schemas/ToolCall' tool_call_id: type: string description: Tool call ID (for messages with the tool role) reasoning_content: type: string description: Reasoning content Tool: type: object properties: type: type: string example: function function: type: object properties: name: type: string description: type: string parameters: type: object description: Parameter definition in JSON Schema format properties: {} ResponseFormat: type: object properties: type: type: string enum: - text - json_object - json_schema json_schema: type: object description: JSON Schema definition properties: {} Usage: type: object properties: prompt_tokens: type: integer description: Prompt tokens completion_tokens: type: integer description: Completion tokens total_tokens: type: integer description: Total tokens prompt_tokens_details: type: object properties: cached_tokens: type: integer text_tokens: type: integer audio_tokens: type: integer image_tokens: type: integer completion_tokens_details: type: object properties: text_tokens: type: integer audio_tokens: type: integer reasoning_tokens: type: integer MessageContent: type: object properties: type: type: string enum: - text - image_url - input_audio - file - video_url text: type: string image_url: type: object properties: url: type: string description: Image URL or base64 detail: type: string enum: - low - high - auto input_audio: type: object properties: data: type: string description: Base64-encoded audio data format: type: string enum: - wav - mp3 file: type: object properties: filename: type: string file_data: type: string file_id: type: string video_url: type: object properties: url: type: string ToolCall: type: object properties: id: type: string type: type: string example: function function: type: object properties: name: type: string arguments: type: string securitySchemes: BearerAuth: type: http scheme: bearer description: | Authenticate with a Bearer Token. Format: `Authorization: Bearer sk-xxxxxx` ````