> ## 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 4.5 T2I > [Core Function] Seedream 4.5 T2I is a high-fidelity visual creation model. [Strengths] It provides all-round improvements in consistency, aesthetics, and photorealism, supporting high-definition outputs up to 4K resolution. [Best For] Highly recommended for: professional visual creatives, photorealistic artwork, and high-res commercial graphics. [Limitations] It lacks the real-time web search and advanced reasoning capabilities of the 5.0 Lite model. [Routing] Use this model when the priority is absolute visual fidelity, resolution (4K), and consistency without the need for real-time search. ## OpenAPI ````yaml /media-model-api/bytedance/bytedance-t2i.json post /bytedance/seedream-4.5-t2i 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-4.5-t2i: post: summary: Seedream 4.5 T2I description: >- [Core Function] Seedream 4.5 T2I is a high-fidelity visual creation model. [Strengths] It provides all-round improvements in consistency, aesthetics, and photorealism, supporting high-definition outputs up to 4K resolution. [Best For] Highly recommended for: professional visual creatives, photorealistic artwork, and high-res commercial graphics. [Limitations] It lacks the real-time web search and advanced reasoning capabilities of the 5.0 Lite model. [Routing] Use this model when the priority is absolute visual fidelity, resolution (4K), and consistency without the need for real-time search. operationId: seedream45T2iAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/Seedream45T2iRequest' examples: basic: summary: High quality 2K generation value: prompt: >- Majestic dragon flying over medieval castle, epic fantasy art ultra_hd: summary: 4K ultra high quality value: prompt: >- Photorealistic portrait of a warrior, intricate armor details size: 4096x4096 sequential_image_generation: auto optimize_prompt_mode: standard 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-ghi789 model_id: model-123 get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-ghi789 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: Seedream45T2iRequest: 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: Majestic dragon flying over medieval castle, epic fantasy art size: type: string description: >- Image size in format 'widthxheight'. Minimum pixels: 2560x1440 (approx 2K) = 3,686,400. Range: Total pixels 3,686,400 to 16,777,216, aspect ratio 1/16 to 16 default: 2048x2048 example: 2048x2048 sequential_image_generation: type: string enum: - auto - disabled description: Batch generation mode default: disabled example: auto sequential_image_generation_max_images: type: integer description: Maximum number of images for batch generation default: 5 minimum: 1 maximum: 15 example: 5 optimize_prompt_mode: type: string enum: - standard description: Prompt optimization mode. Only 'standard' mode is supported for 4.5 default: standard example: standard 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`.' ````