> ## 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-v4.1-flash > Creates a text response from text or image input using DeepSeek V4.1 Flash. ## OpenAPI ````yaml api-reference/model-api/deepseek/openapi/deepseek-v4-1-flash/openapi.yaml POST /v1/chat/completions openapi: 3.1.0 info: title: DeepSeek V4.1 Flash description: >- DeepSeek V4.1 Flash through the AnyFast OpenAI-compatible Chat Completions API. version: 1.0.0 servers: - url: https://www.anyfast.ai security: - bearerAuth: [] paths: /v1/chat/completions: post: summary: Create chat completion description: >- Creates a text response from text or image input using DeepSeek V4.1 Flash. operationId: createChatCompletionDeepseekV41Flash requestBody: required: true content: application/json: schema: type: object required: - model - messages properties: model: type: string enum: - deepseek-v4.1-flash description: AnyFast model ID. example: deepseek-v4.1-flash messages: type: array minItems: 1 description: >- Conversation messages. Image content is accepted only in user messages. items: type: object required: - role - content properties: role: type: string enum: - system - user - assistant - tool content: oneOf: - type: string - type: array items: oneOf: - type: object required: - type - text properties: type: type: string enum: - text text: type: string - type: object required: - type - image_url properties: type: type: string enum: - image_url image_url: type: object required: - url properties: url: type: string description: >- Public HTTP(S) URL or Base64 data URL for a JPEG, PNG, GIF, or WebP image. detail: type: string enum: - low - high - original - auto default: auto reasoning_content: type: string nullable: true description: >- Prior assistant reasoning. Pass it back on subsequent turns when using tools. name: type: string tool_call_id: type: string description: Required for tool messages. tool_calls: type: array items: $ref: '#/components/schemas/ToolCall' thinking: type: object nullable: true description: Thinking mode configuration. Thinking is enabled by default. properties: type: type: string enum: - enabled - disabled default: enabled reasoning_effort: type: string enum: - none - low - high - max default: high description: >- Thinking control and effort. `none` disables thinking; this is a top-level field, separate from `thinking`. max_tokens: type: integer minimum: 1 maximum: 393216 description: Maximum number of generated tokens. response_format: type: object properties: type: type: string enum: - text - json_object default: text description: >- Use `json_object` for JSON mode and explicitly request JSON in the prompt. stop: oneOf: - type: string - type: array maxItems: 16 items: type: string stream: type: boolean default: false description: Stream partial message deltas over SSE. stream_options: type: object properties: include_usage: type: boolean default: false temperature: type: number minimum: 0 maximum: 2 default: 1 description: Ignored when thinking mode is enabled. top_p: type: number minimum: 0 maximum: 1 default: 1 description: >- In thinking mode, values below 0.95 are treated as 0.95; in non-thinking mode the effective value is 1.0. tools: type: array items: type: object required: - type - function properties: type: type: string enum: - function function: type: object required: - name - parameters properties: name: type: string description: type: string parameters: type: object description: Function parameters expressed as JSON Schema. strict: type: boolean tool_choice: oneOf: - type: string enum: - none - auto - required - type: object required: - type - function properties: type: type: string enum: - function function: type: object required: - name properties: name: type: string frequency_penalty: type: number minimum: -2 maximum: 2 default: 0 description: >- Accepted for compatibility but has no effect in thinking mode. presence_penalty: type: number minimum: -2 maximum: 2 default: 0 description: >- Accepted for compatibility but has no effect in thinking mode. user_id: type: string maxLength: 512 pattern: ^[a-zA-Z0-9\-_]+$ description: >- Stable end-user identifier for content safety and cache isolation. examples: text: summary: Text input value: model: deepseek-v4.1-flash messages: - role: user content: Explain how a B-tree index accelerates database queries. max_tokens: 1024 vision: summary: Image input value: model: deepseek-v4.1-flash messages: - role: user content: - type: text text: Describe this image and read any visible text. - type: image_url image_url: url: https://example.com/chart.png thinking: summary: Thinking mode value: model: deepseek-v4.1-flash messages: - role: user content: Find and explain the bug in this algorithm. thinking: type: enabled reasoning_effort: high responses: '200': description: Chat completion created content: application/json: schema: $ref: '#/components/schemas/ChatCompletion' '400': description: Invalid request content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Unauthorized '429': description: Rate limit exceeded components: schemas: ToolCall: type: object properties: id: type: string type: type: string enum: - function function: type: object properties: name: type: string arguments: type: string ChatCompletion: type: object required: - id - object - created - model - choices - usage properties: id: type: string example: chatcmpl-example object: type: string enum: - chat.completion created: type: integer description: Unix timestamp in seconds. model: type: string example: deepseek-v4.1-flash choices: type: array items: type: object properties: index: type: integer message: type: object properties: role: type: string enum: - assistant content: type: string nullable: true reasoning_content: type: string nullable: true description: Reasoning generated when thinking mode is enabled. tool_calls: type: array nullable: true items: $ref: '#/components/schemas/ToolCall' finish_reason: type: string nullable: true enum: - stop - length - content_filter - tool_calls - insufficient_system_resource - null usage: type: object properties: prompt_tokens: type: integer completion_tokens: type: integer total_tokens: type: integer prompt_tokens_details: type: object properties: cached_tokens: type: integer prompt_cache_hit_tokens: type: integer prompt_cache_miss_tokens: type: integer Error: type: object properties: error: type: object properties: message: type: string type: type: string code: type: string securitySchemes: bearerAuth: type: http scheme: bearer ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.