> ## Documentation Index > Fetch the complete documentation index at: https://docs.modellix.ai/llms.txt > Use this file to discover all available pages before exploring further. # Seedream 5.0 Pro > [Core Function] Seedream 5.0 Pro is ByteDance's flagship professional-grade Text-to-Image (T2I) generation model. [Strengths] It delivers top-tier image quality with enhanced precision control over positions and elements, superior prompt adherence, and improved generation consistency for professional scenarios. [Best For] Highly recommended for: professional design assets, high-fidelity photorealistic imagery, precisely controlled compositions, and brand or commercial visuals where quality matters most. [Limitations] Do NOT use this model for batch image generation or streaming output; it generates exactly one image per request and supports up to 2K resolution (no 3K/4K). [Routing] Choose this Pro model when the user emphasizes ultimate quality or precision. Choose Seedream 5.0 Lite when real-time web knowledge, batch generation, or 3K resolution is needed. To edit an existing image use Seedream 5.0 Pro Edit; to blend multiple reference images use Seedream 5.0 Pro Multi-Reference. ## OpenAPI ````yaml /model-api/bytedance/bytedance-t2i.json post /bytedance/seedream-5.0-pro openapi: 3.1.0 info: description: The text-to-image models API from ByteDance. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: ByteDance Text-to-Image Models API servers: - url: https://api.modellix.ai/api/v1 description: The text-to-image models API from ByteDance. security: - bearerAuth: [] paths: /bytedance/seedream-5.0-pro: post: summary: Seedream 5.0 Pro description: >- [Core Function] Seedream 5.0 Pro is ByteDance's flagship professional-grade Text-to-Image (T2I) generation model. [Strengths] It delivers top-tier image quality with enhanced precision control over positions and elements, superior prompt adherence, and improved generation consistency for professional scenarios. [Best For] Highly recommended for: professional design assets, high-fidelity photorealistic imagery, precisely controlled compositions, and brand or commercial visuals where quality matters most. [Limitations] Do NOT use this model for batch image generation or streaming output; it generates exactly one image per request and supports up to 2K resolution (no 3K/4K). [Routing] Choose this Pro model when the user emphasizes ultimate quality or precision. Choose Seedream 5.0 Lite when real-time web knowledge, batch generation, or 3K resolution is needed. To edit an existing image use Seedream 5.0 Pro Edit; to blend multiple reference images use Seedream 5.0 Pro Multi-Reference. operationId: seedream50ProT2iAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/Seedream50ProT2iRequest' examples: basic: summary: Basic generation value: prompt: A cinematic sunset over a futuristic city skyline full_params: summary: Full parameters with PNG output value: prompt: >- A futuristic city at sunset, ultra detailed, cinematic lighting, volumetric clouds size: 2048x2048 optimize_prompt_mode: fast output_format: png responses: '200': description: Task submitted successfully content: application/json: schema: $ref: '#/components/schemas/AsyncTaskResponse' example: code: 0 message: success data: status: pending task_id: task-seedream50pro001 model_id: bytedance/seedream-5.0-pro get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-seedream50pro001 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: Seedream50ProT2iRequest: type: object required: - prompt properties: prompt: type: string description: >- Image description text, supports Chinese and English. Maximum 10000 characters. We recommend keeping the prompt under 600 words. Excessively long prompts may scatter information, causing the model to overlook details and focus only on major elements, which can result in missing details in the generated image. minLength: 1 maxLength: 10000 example: A futuristic city at sunset, ultra detailed size: type: string description: >- Image size in format 'widthxheight'. Total pixels must be within [1280x720(921,600), 4,624,220] and aspect ratio within [1/16, 16], corresponding to the official 1K/2K resolution levels (3K/4K not supported). Recommended 2K sizes: 2048x2048 (1:1), 2816x1584 (16:9), 2368x1776 (4:3). default: 1024x1024 example: 2048x2048 optimize_prompt_mode: type: string enum: - standard - fast description: >- Prompt optimization mode. 'standard': higher quality with longer generation time. 'fast': faster generation with slightly lower quality. default: standard example: standard output_format: type: string enum: - jpeg - png description: 'Output image format. Supported values: ''jpeg'' and ''png''.' default: jpeg example: png AsyncTaskResponse: type: object required: - code - message - data properties: code: type: integer description: Response code, 0 indicates success example: 0 message: type: string description: Response message example: success data: type: object required: - status - task_id - model_id properties: status: type: string enum: - pending - processing description: Task status example: pending task_id: type: string description: Unique task identifier example: task-abc123 model_id: type: string description: Model ID example: model-123 get_result: type: object description: API information to query the task result properties: method: type: string description: HTTP method example: GET url: type: string description: Full URL to query the task result example: https://api.modellix.ai/api/v1/tasks/task-abc123 description: Detailed data about the submitted asynchronous task. ErrorResponse: type: object required: - code - message properties: code: type: integer description: Error code (equals HTTP status code) example: 400 message: type: string description: 'Error message in format ''Category: detail''' example: 'Invalid parameters: parameter ''prompt'' is required' responses: BadRequest: description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 400 message: 'Invalid parameters: parameter ''prompt'' is required' Unauthorized: description: Unauthorized - Invalid or missing API Key content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 401 message: 'Authentication failed: invalid API key' TooManyRequests: description: Too many requests - Rate limit exceeded headers: X-RateLimit-Limit: description: Maximum requests per minute schema: type: integer example: 100 X-RateLimit-Remaining: description: Remaining quota in current window schema: type: integer example: 0 X-RateLimit-Reset: description: Rate limit window reset time (Unix timestamp) schema: type: integer example: 1704067260 content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 429 message: >- Rate limit exceeded: 100 requests per minute, retry after 60 seconds InternalServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 500 message: Internal server error securitySchemes: bearerAuth: type: http scheme: bearer description: 'API Key authentication. Format: `Bearer YOUR_API_KEY`.' ````