Seedream 4.5 Unified for Image Generation

Seedream 4.5 Unified text-to-image generation from ByteDance. Write a prompt, optionally connect reference images, and generate.

This is a cloud API workflow. Seedream 4.5 Unified combines text-to-image generation and image editing in a single architecture: the same model that generates from scratch also edits, retouches, and replaces elements when you connect reference images. Output goes up to 4K. Text rendering, character consistency, and prompt adherence are all significantly improved over earlier Seedream versions.

The default prompt ships as a detailed isometric scene: a cozy cyber-café with retro CRT monitors, RGB lighting, pixel-art style, and specific interior detail. That level of specificity is what the model responds to well.

How do you use Seedream 4.5 Unified for image generation?

Write a prompt, optionally connect one or two reference images, set your resolution and batch size, and run. Seedream 4.5 Unified handles text-to-image generation and image editing through the same node. For pure generation, prompt only. For reference-guided generation or editing, connect images and describe the relationship in the prompt.

Prompt The single most important input. Seedream 4.5 Unified follows detailed, multi-element prompts accurately. The default prompt covers view type, environment, subjects, lighting, art style, and specific design details in one sentence.

Prompting approach that works: Lead with view or composition: "isometric view," "cinematic close-up," "overhead product shot," "three-quarter portrait." Name the setting with specifics: "cozy cyber-café filled with retro CRT monitors and RGB lights," not "a café." Include style direction explicitly: "pixel-art style," "studio photography," "editorial illustration," "hyperrealistic render." For text in the image: write the exact string in quotation marks and specify placement, font style, and surrounding design. For character consistency across multiple generations: describe the character's appearance as a fixed anchor at the start of every prompt.

Reference images (image1 and image2) Connect reference images when you want to guide generation from a visual source rather than text alone. What each reference does depends on your prompt: one can anchor a character's appearance, the other can define a style or setting. Describe the relationship explicitly in the prompt: "apply the style from image 1 to the scene in image 2" or "place the character from image 1 into the environment described."

Without a connected reference, the workflow runs as pure text-to-image generation.

Size preset (default: custom) Set to custom by default, which reads the width and height values directly. Switch to a named preset (1080p, 2K, 4K) for standardized output sizes without manually setting dimensions.

Width / Height (default: 2048 x 2048) 2048x2048 is the default. Adjust for portrait, landscape, or platform-specific formats. For print-adjacent or cinematic stills where fine detail matters, 4K is supported.

Batch mode and batch size (default: single, 1) Single mode generates one image per run. Switch to batch when you want multiple outputs from the same prompt: variations for A/B testing, panel sets for storyboards, or product variants for a catalog. Batch size sets how many images the model generates per run.

Watermark (default: off) Off by default.

What is Seedream 4.5 Unified good for?

Seedream 4.5 Unified is strongest for professional-grade image work where text rendering, character consistency, and prompt adherence all matter. Storyboards, product catalogs, character sheets, poster design, UI mockups, and marketing assets where the same quality and style need to hold across many outputs.

Storyboards and character sheets. Generate multiple panels with the same character in different poses or scenes without identity drift. Seedream 4.5 preserves character anatomy, clothing, and style across batch generations. Feed a character reference into image1 and describe each panel variation in the prompt.

Marketing and product catalogs. Maintain consistent lighting, perspective, and style across multiple product images or campaign variants. Generate a full set of product images in a single batch run with identical visual treatment.

Posters, packaging, and UI mockups. Seedream 4.5 handles dense text and typography more accurately than most image models. Write the exact text strings you want rendered in quotation marks in the prompt. Labels, headlines, UI copy, and small-font details all hold up at high resolution.

Character and IP development. Lock a character's appearance with a detailed description or reference image, then generate outfit variations, scene placements, and pose explorations. The model maintains identity coherence across variations better than models without multi-reference conditioning.

Image editing and refinement. Connect an existing image as a reference and describe the change. Object removal, background replacement, style transfer, and outpainting all run through the same model as generation. Quality stays consistent between generate and edit operations.

Honest notes: Seedream 4.5 Unified applies content moderation that some users find stricter than expected on edge cases. It's a cloud API, so generation speed depends on ByteDance's infrastructure. For maximum photorealistic quality without multi-reference or text rendering requirements, testing both Seedream 4.5 and 4.0 is worth the comparison.

How does Seedream 4.5 Unified compare to Seedream 4.0 and 5.0 Lite?

Seedream 4.5 Unified improves on 4.0 for raw photorealistic quality and adds stronger prompt adherence and text rendering. Seedream 5.0 Lite adds support for up to 14 reference images and improved character consistency, but some users find 4.5 ahead on pure image realism. For generation tasks that need text accuracy and high visual quality, 4.5 is the current benchmark.

Seedream 4.0 is noted for strong editing instruction-following, particularly for structural edits from a reference. For complex reference-guided scene construction, 4.0 remains competitive. For pure generation quality and text rendering, 4.5 is the step forward.

Seedream 5.0 Lite's 14-reference support makes it the stronger pick for character consistency tasks that require many visual anchors. For most generation and editing work where 2 references are enough, 4.5 Unified's quality edge makes it worth trying first.

FAQ

What is Seedream 4.5 Unified and how does it work?
Seedream 4.5 Unified is ByteDance's image model that handles text-to-image generation and image editing in the same architecture. Write a prompt, optionally connect reference images, and the model generates or edits based on your instruction. It runs as a cloud API. No local model or VRAM management needed.

How do I render accurate text in images with Seedream 4.5 Unified?
Write the exact text string in quotation marks in your prompt and specify placement, font style, and surrounding design context. "A poster with the headline 'Summer Sale 2025' in bold white serif type on a dark blue background." Seedream 4.5's text rendering handles dense typography, small-font details, and multilingual text more accurately than most image models.

How do I maintain character consistency across multiple images with Seedream 4.5?
Connect a character reference to image1 and describe the character's fixed appearance at the start of every prompt. Use batch mode to generate multiple panels in one run. The model reads image1 for identity and applies it across the batch, maintaining face, clothing, and style consistency.

What is the difference between Seedream 4.5 Unified and Seedream 5.0 Lite?
Seedream 5.0 Lite supports up to 14 reference images and has improved character consistency for complex multi-reference tasks. Seedream 4.5 Unified is ahead on raw image realism and text rendering accuracy. For most generation tasks with 2 references or fewer, 4.5 is the stronger starting point.

How do I run Seedream 4.5 Unified online?
You can run Seedream 4.5 Unified online through Floyo. No installation, no setup. Open the workflow in your browser, write your prompt, and hit run. Free to try.