BYTEDANCE

Bytedance Seedream 4.5 is a new-generation text-to-image AI generator developed by ByteDance and integrated within the fal.ai platform. Uniquely designed for both image generation and image editing, the model merges both capabilities into a single, unified architecture. This consolidation means users no longer need to route between dedicated text-to-image endpoints and separate image-editing endpoints or manage multiple parameter schemas. Instead, workflows involving creation, modification, and refinement of images can be performed seamlessly through one interface, streamlining integration and development efforts.

Seedream 4.5 is optimized to serve commercial applications, including product mockup generation, marketing asset creation, and creative iteration workflows. It is especially well-suited for developers and organizations who demand flexible, high-quality image generation without the overhead of juggling multiple APIs or system integrations. With its accessible architecture, the model allows for batch generation and supports high-volume workflows, positioning it as an efficient solution for various business and creative requirements.

In terms of technical capabilities, Seedream 4.5 accepts text prompts written in detailed natural language, allowing users to describe the desired image with precision. The output format is PNG, delivered either via HTTPS URL (async by default) or as a data URI in synchronous mode. The model supports high-resolution outputs of up to 4 megapixels (2048x2048 pixels maximum per dimension) and offers flexible aspect ratios with a permissible width and height from 1920 to 4096 pixels, and a total pixel count ranging from 2560x1440 up to 4096x4096. This enables users to generate images with a variety of resolutions and layouts, accommodating use cases from print-ready graphics to detailed digital assets.

Advanced batch generation features are supported, where users can request up to 6 separate images per API call, with the ability to generate multiple variations per generation using the max_images parameter. This is particularly useful for A/B testing, creative selection, or generating image sets for campaigns.

To ensure reproducibility, the model supports setting explicit seed values, enabling users to recreate specific outputs and maintain consistency across different runs—an essential feature for iterative workflows or controlled testing scenarios.

A safety checker is built into the model and enabled by default for content filtering, ensuring results adhere to specified safety standards. Users operating in controlled environments have the option to disable this feature if required.

For interoperability, Seedream 4.5 is accessible through the fal.ai API, with both async and sync modes available depending on integration preferences. Image size parameters can be customized either through explicit width and height values or through convenient presets such as 'square_hd', 'portrait_4_3', 'landscape_16_9', and others.

Seedream 4.5’s unique approach is best reflected in its unified architecture, which consolidates the core functionalities of content generation and editing previously offered by separate model versions. Compared to earlier iterations (such as Seedream v3 and v4), Seedream 4.5 trades endpoint specialization for workflow fluidity, aiming to cover all stages of creative image work within a single model interface.

Commercial use of Seedream 4.5 is permitted under a partner agreement, supporting integration into business-critical production environments. The model outputs only PNG format, and the supported output dimension and aspect ratio ranges are strictly defined by the platform schema. While no explicit output limitations beyond these configuration parameters are mentioned, best practices include utilizing the deterministic seed controls for reproducibility and engaging the built-in safety features unless working in fully managed environments.

Finally, Seedream 4.5 is positioned as an evolution within ByteDance’s model family, offering architectural refinements specific to prompt interpretation and generation-editing workflow consolidation.