--- title: Seedream 4.5 | Runware Docs url: https://runware.ai/docs/models/bytedance-seedream-4-5 description: Seedream 4.5 high fidelity multi reference text to image model --- # Seedream 4.5 Seedream 4.5 is a ByteDance image model for precise 2K to 4K generation and editing. It improves multi image composition, preserves reference detail, and renders small text more reliably. It supports up to 14 reference images for stable characters and design heavy layouts. - **ID**: `bytedance:seedream@4.5` - **Status**: live - **Creator**: ByteDance - **Release Date**: December 3, 2025 - **Capabilities**: Text to Image, Image to Image, Edit, Checkpoint ## Pricing - **2k & 4k**: `$0.04` ## Compatibility & Validation Either provide `inputs.referenceImages`, or specify `width/height`. --- `resolution` cannot be used with `width/height`. --- When `resolution` is provided, `inputs.referenceImages` is required. --- `width` and `height` must be used together. ## Notes **Recommended 2K dimensions:** | Aspect Ratio | Width × Height | | --- | --- | | 1:1 | 2048 × 2048 | | 4:3 | 2304 × 1728 | | 3:4 | 1728 × 2304 | | 16:9 | 2560 × 1440 | | 9:16 | 1440 × 2560 | | 3:2 | 2496 × 1664 | | 2:3 | 1664 × 2496 | | 21:9 | 3024 × 1296 | **Recommended 4K dimensions:** | Aspect Ratio | Width × Height | | --- | --- | | 1:1 | 4096 × 4096 | | 4:3 | 4608 × 3456 | | 3:4 | 3456 × 4608 | | 16:9 | 5120 × 2880 | | 9:16 | 2880 × 5120 | | 3:2 | 4992 × 3328 | | 2:3 | 3328 × 4992 | | 21:9 | 6048 × 2592 | ## Request Parameters **API Options** Platform-level options for task execution and delivery. ### [taskType](https://runware.ai/docs/models/bytedance-seedream-4-5#request-tasktype) - **Type**: `string` - **Required**: true - **Value**: `imageInference` Identifier for the type of task being performed ### [taskUUID](https://runware.ai/docs/models/bytedance-seedream-4-5#request-taskuuid) - **Type**: `string` - **Required**: true - **Format**: `UUID v4` UUID v4 identifier for tracking tasks and matching async responses. Must be unique per task. ### [outputType](https://runware.ai/docs/models/bytedance-seedream-4-5#request-outputtype) - **Type**: `string` - **Default**: `URL` Image output type. **Allowed values**: `URL` `base64Data` `dataURI` ### [outputFormat](https://runware.ai/docs/models/bytedance-seedream-4-5#request-outputformat) - **Type**: `string` - **Default**: `JPG` Specifies the file format of the generated output. The available values depend on the task type and the specific model's capabilities. - \`JPG\`: Best for photorealistic images with smaller file sizes (no transparency). - \`PNG\`: Lossless compression, supports high quality and transparency (alpha channel). - \`WEBP\`: Modern format providing superior compression and transparency support. > [!NOTE] > \*\*Transparency\*\*: If you are using features like background removal or LayerDiffuse that require transparency, you must select a format that supports an alpha channel (e.g., \`PNG\`, \`WEBP\`, \`TIFF\`). \`JPG\` does not support transparency. **Allowed values**: `JPG` `PNG` `WEBP` ### [outputQuality](https://runware.ai/docs/models/bytedance-seedream-4-5#request-outputquality) - **Type**: `integer` - **Min**: `20` - **Max**: `99` - **Default**: `95` Compression quality of the output. Higher values preserve quality but increase file size. ### [webhookURL](https://runware.ai/docs/models/bytedance-seedream-4-5#request-webhookurl) - **Type**: `string` - **Format**: `uri` Specifies a webhook URL where JSON responses will be sent via HTTP POST when generation tasks complete. For batch requests with multiple results, each completed item triggers a separate webhook call as it becomes available. **Learn more** (1 resource): - [Webhooks](https://runware.ai/docs/platform/webhooks) (platform) ### [deliveryMethod](https://runware.ai/docs/models/bytedance-seedream-4-5#request-deliverymethod) - **Type**: `string` - **Default**: `sync` Determines how the API delivers task results. **Allowed values**: - `sync` Returns complete results directly in the API response. - `async` Returns an immediate acknowledgment with the task UUID. Poll for results using getResponse. **Learn more** (1 resource): - [Task Polling](https://runware.ai/docs/platform/task-polling) (platform) ### [uploadEndpoint](https://runware.ai/docs/models/bytedance-seedream-4-5#request-uploadendpoint) - **Type**: `string` - **Format**: `uri` Specifies a URL where the generated content will be automatically uploaded using the HTTP PUT method. The raw binary data of the media file is sent directly as the request body. For secure uploads to cloud storage, use presigned URLs that include temporary authentication credentials. **Common use cases:** - **Cloud storage**: Upload directly to S3 buckets, Google Cloud Storage, or Azure Blob Storage using presigned URLs. - **CDN integration**: Upload to content delivery networks for immediate distribution. ```text // S3 presigned URL for secure upload https://your-bucket.s3.amazonaws.com/generated/content.mp4?X-Amz-Signature=abc123&X-Amz-Expires=3600 // Google Cloud Storage presigned URL https://storage.googleapis.com/your-bucket/content.jpg?X-Goog-Signature=xyz789 // Custom storage endpoint https://storage.example.com/uploads/generated-image.jpg ``` The content data will be sent as the request body to the specified URL when generation is complete. ### [safety](https://runware.ai/docs/models/bytedance-seedream-4-5#request-safety) - **Path**: `safety.checkContent` - **Type**: `object (1 property)` Content safety checking configuration for image generation. #### [checkContent](https://runware.ai/docs/models/bytedance-seedream-4-5#request-safety-checkcontent) - **Path**: `safety.checkContent` - **Type**: `boolean` Enable or disable content safety checking. Increases total generation time. ### [ttl](https://runware.ai/docs/models/bytedance-seedream-4-5#request-ttl) - **Type**: `integer` - **Min**: `60` Time-to-live (TTL) in seconds for generated content. Only applies when `outputType` is `URL`. ### [includeCost](https://runware.ai/docs/models/bytedance-seedream-4-5#request-includecost) - **Type**: `boolean` Include task cost in the response. ### [numberResults](https://runware.ai/docs/models/bytedance-seedream-4-5#request-numberresults) - **Type**: `integer` - **Min**: `1` - **Max**: `20` - **Default**: `1` Number of results to generate. Each result uses a different seed, producing variations of the same parameters. **Inputs** Input resources for the task (images, audio, etc). These must be nested inside the \`inputs\` object. ### [referenceImages](https://runware.ai/docs/models/bytedance-seedream-4-5#request-inputs-referenceimages) - **Path**: `inputs.referenceImages` - **Type**: `array of strings` - **File size (each)**: `up to 10 MB` - **Size (each)**: `14 px to 6000 px` - **Aspect ratio (each)**: `1:16 to 16:1` List of reference images (UUID, URL, Data URI, or Base64). **Core Parameters** Primary parameters that define the task output. ### [model](https://runware.ai/docs/models/bytedance-seedream-4-5#request-model) - **Type**: `string` - **Required**: true - **Value**: `bytedance:seedream@4.5` Identifier of the model to use for generation. **Learn more** (3 resources): - [Text To Image: Model Selection](https://runware.ai/docs/learn/text-to-image#model-selection) (learn) - [Image Inpainting: Model Specialized Inpainting Models](https://runware.ai/docs/learn/image-inpainting#model-specialized-inpainting-models) (learn) - [Image Outpainting: Other Critical Parameters](https://runware.ai/docs/learn/image-outpainting#other-critical-parameters) (learn) ### [positivePrompt](https://runware.ai/docs/models/bytedance-seedream-4-5#request-positiveprompt) - **Type**: `string` - **Required**: true - **Min**: `1` - **Max**: `3000` Text prompt describing elements to include in the generated output. **Learn more** (1 resource): - [Prompts](https://runware.ai/docs/learn/prompts) (learn) ### [width](https://runware.ai/docs/models/bytedance-seedream-4-5#request-width) - **Type**: `integer` - **Required**: true - **Min**: `256` - **Max**: `16383` Width of the generated media in pixels. **Learn more** (2 resources): - [Dimensions](https://runware.ai/docs/learn/dimensions) (learn) - [Image Outpainting: Dimensions Critical For Outpainting](https://runware.ai/docs/learn/image-outpainting#dimensions-critical-for-outpainting) (learn) ### [height](https://runware.ai/docs/models/bytedance-seedream-4-5#request-height) - **Type**: `integer` - **Required**: true - **Min**: `256` - **Max**: `16383` Height of the generated media in pixels. **Learn more** (2 resources): - [Dimensions](https://runware.ai/docs/learn/dimensions) (learn) - [Image Outpainting: Dimensions Critical For Outpainting](https://runware.ai/docs/learn/image-outpainting#dimensions-critical-for-outpainting) (learn) ### [resolution](https://runware.ai/docs/models/bytedance-seedream-4-5#request-resolution) - **Type**: `string` Resolution preset for the output. When used with input media, automatically matches the aspect ratio from the input. **Allowed values**: `2K` `4K` ### [seed](https://runware.ai/docs/models/bytedance-seedream-4-5#request-seed) - **Type**: `integer` - **Min**: `0` - **Max**: `2147483647` Random seed for reproducible generation. When not provided, a random seed is generated in the unsigned 32-bit range. **Features** Standalone addons and post-processing features. ### [watermark](https://runware.ai/docs/models/bytedance-seedream-4-5#request-advancedfeatures-watermark) - **Path**: `advancedFeatures.watermark` - **Type**: `object (6 properties)` Configuration object for adding watermarks to generated videos. Watermarks can be applied using either text or image content with customizable positioning and appearance. You must provide either `text` or `image` content for the watermark, but not both. **Text watermark**: ```json "advancedFeatures": { "watermark": { "text": "© 2025 Company", "displayPosition": "bottom-right", "opacity": 0.6, "fontColor": "#ffffff", "bgColor": "#000000" } } ``` **Image watermark**: ```json "advancedFeatures": { "watermark": { "image": "c64351d5-4c59-42f7-95e1-eace013eddab", "displayPosition": "top-left", "opacity": 0.6 } } ``` **Tiled watermark**: ```json "advancedFeatures": { "watermark": { "text": "PREVIEW", "tiled": true, "opacity": 0.4, "fontColor": "#cccccc" } } ``` #### [text](https://runware.ai/docs/models/bytedance-seedream-4-5#request-advancedfeatures-watermark-text) - **Path**: `advancedFeatures.watermark.text` - **Type**: `string` - **Min**: `2` - **Max**: `32` Watermark text. #### [image](https://runware.ai/docs/models/bytedance-seedream-4-5#request-advancedfeatures-watermark-image) - **Path**: `advancedFeatures.watermark.image` - **Type**: `string` Watermark image (UUID, URL, Data URI, or Base64). #### [displayPosition](https://runware.ai/docs/models/bytedance-seedream-4-5#request-advancedfeatures-watermark-displayposition) - **Path**: `advancedFeatures.watermark.displayPosition` - **Type**: `string` Watermark position. **Allowed values**: `top-left` `top-center` `top-right` `center-left` `center-center` `center-right` `bottom-left` `bottom-center` `bottom-right` `tiled` #### [opacity](https://runware.ai/docs/models/bytedance-seedream-4-5#request-advancedfeatures-watermark-opacity) - **Path**: `advancedFeatures.watermark.opacity` - **Type**: `float` - **Min**: `0.1` - **Max**: `1` - **Step**: `0.01` Watermark opacity. #### [fontColor](https://runware.ai/docs/models/bytedance-seedream-4-5#request-advancedfeatures-watermark-fontcolor) - **Path**: `advancedFeatures.watermark.fontColor` - **Type**: `string` Text color in hex format. #### [bgColor](https://runware.ai/docs/models/bytedance-seedream-4-5#request-advancedfeatures-watermark-bgcolor) - **Path**: `advancedFeatures.watermark.bgColor` - **Type**: `string` Background color in hex format. **Provider Settings** Parameters specific to this model provider. These must be nested inside the \`providerSettings.bytedance\` object. ### [maxSequentialImages](https://runware.ai/docs/models/bytedance-seedream-4-5#request-providersettings-bytedance-maxsequentialimages) - **Path**: `providerSettings.bytedance.maxSequentialImages` - **Type**: `integer` - **Min**: `1` - **Max**: `15` Maximum number of sequential images to generate. Combined total of reference images plus sequential images cannot exceed 15. The model may generate fewer images than requested depending on prompt complexity. ## Response Parameters ### [taskType](https://runware.ai/docs/models/bytedance-seedream-4-5#response-tasktype) - **Type**: `string` - **Required**: true - **Value**: `imageInference` Identifier for the type of task this response belongs to. ### [taskUUID](https://runware.ai/docs/models/bytedance-seedream-4-5#response-taskuuid) - **Type**: `string` - **Required**: true - **Format**: `UUID v4` UUID v4 identifier echoed from the original request, used to match async responses to their tasks. ### [imageUUID](https://runware.ai/docs/models/bytedance-seedream-4-5#response-imageuuid) - **Type**: `string` - **Required**: true - **Format**: `UUID v4` UUID of the output image. ### [imageURL](https://runware.ai/docs/models/bytedance-seedream-4-5#response-imageurl) - **Type**: `string` - **Format**: `uri` URL of the output image. ### [imageBase64Data](https://runware.ai/docs/models/bytedance-seedream-4-5#response-imagebase64data) - **Type**: `string` Base64-encoded image data. ### [imageDataURI](https://runware.ai/docs/models/bytedance-seedream-4-5#response-imagedatauri) - **Type**: `string` - **Format**: `uri` Data URI of the output image. ### [seed](https://runware.ai/docs/models/bytedance-seedream-4-5#response-seed) - **Type**: `integer` The seed used for generation. If none was provided, shows the randomly generated seed. ### [NSFWContent](https://runware.ai/docs/models/bytedance-seedream-4-5#response-nsfwcontent) - **Type**: `boolean` Flag indicating if NSFW content was detected. ### [cost](https://runware.ai/docs/models/bytedance-seedream-4-5#response-cost) - **Type**: `float` Task cost in USD. Present when `includeCost` is set to `true` in the request. ## Examples ### Futuristic Luxury Watch Campaign (Image to Image) ![Futuristic Luxury Watch Campaign](https://assets.runware.ai/examples/bytedance-seedream-4-5/b90beb0e-2218-464a-90cb-9aaa1f7791e2.jpg) --- ### Editorial Poster Layout (Image to Image) ![Editorial Poster Layout](https://assets.runware.ai/examples/bytedance-seedream-4-5/e99c809d-79ab-4c83-9012-610162527dbc.jpg) --- ### Retro-Futurist Transit Poster Design (Text to Image) ![Retro-Futurist Transit Poster Design](https://assets.runware.ai/examples/bytedance-seedream-4-5/e391d18b-29e2-4807-9b1c-2c0cd68f62a6.jpg) --- ### Retro-Futurist Transit Poster Layout (Image to Image) ![Retro-Futurist Transit Poster Layout](https://assets.runware.ai/examples/bytedance-seedream-4-5/37088f97-9c63-4d0a-8b02-3530e63a08b1.jpg) --- ### Brand Poster Layout (Image to Image) ![Brand Poster Layout](https://assets.runware.ai/examples/bytedance-seedream-4-5/4b2f76eb-556c-418e-896a-f16789e65fd5.jpg) --- ### Moonlit Desert Observatory Poster (Text to Image) ![Moonlit Desert Observatory Poster](https://assets.runware.ai/examples/bytedance-seedream-4-5/b1ca9192-1310-4035-9104-3dc6202c3d72.jpg) --- ### Editorial Product Poster (Text to Image) ![Editorial Product Poster](https://assets.runware.ai/examples/bytedance-seedream-4-5/848a182a-b9db-49d6-accc-3560684f9b5d.jpg) --- ### Branded Product Launch Poster (Image to Image) ![Branded Product Launch Poster](https://assets.runware.ai/examples/bytedance-seedream-4-5/71656a00-a462-4945-a2cd-f3f94f0c07de.jpg)