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Favicon for bytedance-seed

ByteDance Seed: Seedream 5.5

bytedance-seed/seedream-5-5

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Seedream 5.5 is an image generation and editing model from ByteDance Seed. It takes a text prompt and up to 10 reference images and produces images from about 0.9 to 4.6 megapixels.

Modalities
Price
from $0.02/image
Released
Nov 12, 2026
BenchmarksCompare
PlaygroundProvidersPricingPerformanceUptimeAppsActivityFAQExplore

Example outputs summary for ByteDance Seed: Seedream 5.5

  • Text to Image: Editorial architectural photograph of a contemporary neighborhood storefront at blue hour, glowing warmly against the dusk. Above the entrance, a warm-white neon sign in flowing hand-bent cursive reads exactly "OpenRouter", the only text in the scene. Large windows reveal a cozy, lived-in interior: wood shelves styled with books and ceramics, lush trailing plants, and soft pendant lighting. Potted plants and a bicycle rest by the entrance, and golden light spills across the wet pavement in gentle reflections. Straight-on composition, realistic materials, quiet street with no people. — generated with ByteDance Seed: Seedream 5.5
  • Image to Image: Turn this photo into a snowy winter night: snow falling and settling on the sidewalk, the bicycle and the window ledges. Keep the exact composition, the storefront and the glowing neon sign that reads exactly "OpenRouter". — generated with ByteDance Seed: Seedream 5.5

Playground

Providers

This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make.

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Latency is how long it takes to generate and return the image (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Not currently available through EU in-region routing. In-region routing docs

Explore more models

AI Models with Vision: Multimodal LLMs for Image UnderstandingCollectionImage Generation ModelsCollectionImage Model RankingsRanking
End-to-end latency
$0.008$0.0220.45s
--
ProviderImage input / Image output /img
  • Favicon for Seed
    Image input $0.008 / Image output $0.02
    20.45s latency-- uptime
End-to-end latency
20.45s

P50, best provider

Not enough uptime data to display yet.

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Not enough data for apps using this model yet.

Frequently asked questions

Seedream 5.5 is an image generation and editing model from ByteDance Seed. It takes a text prompt and up to 10 reference images and produces images from about 0.9 to 4.6 megapixels.

Seedream 5.5 costs $0.02/image for Image Output, $0.035/image for High-Resolution Image Output, and $0.008/image for Image Input.

Seedream 5.5 renders at 1K, 1.5K, and 2K and supports the 1:1, 1:2, 2:1, 2:3, 3:2, 3:4 and 11 more aspect ratios.

Seedream 5.5 accepts text and images as input and returns images. Up to 10 reference images can be attached to one request for image editing.

Seedream 5.5 is served by 1 provider on OpenRouter: Seed.

Seedream 5.0 Flash, Seedream 5.0 Lite, Seedream 5.0 Pro and 1 more are other image models from ByteDance Seed.

Seedream 5.5 was released on November 12, 2026.

More models from bytedance-seed

Seedream 5.0 Flash

Seedream 5.0 Flash is an image generation and editing model from ByteDance Seed. It is the fast, cost-efficient tier of the Seedream 5.0 family, suited for high-volume production and interactive editing workflows that need precise edits at low latency.

Imagefrom $0.018/image
Seed Audio 1.0

Seed Audio 1.0 is ByteDance Seed's non-streaming audio generation model. It produces speech and other audio from a natural-language text prompt that can describe the desired voice, tone, and sound effects, optionally guided by a Seed speaker ID or a reference audio clip for voice cloning. Output is limited to 120 seconds per request and is billed per second of generated audio. Suited to audiobooks, voiceovers, games, and similar workloads.

Speech$0.15/minute
Seedream 5.0 Lite

Seedream 5.0 Lite is an image generation model from ByteDance Seed. It is suited for professional visual creation that benefits from web-connected retrieval, complex-prompt comprehension, visual references, and broad knowledge coverage.

Imagefrom $0.035/image
Seedream 5.0 Pro

Seedream 5.0 Pro is an image generation and editing model from ByteDance Seed. It is suited for commercial visual-production workflows that require precise editing control, lifelike scenes, and natural rendering.

Imagefrom $0.045/image
Seed 2.1 Turbo

Seed 2.1 Turbo is a multimodal model from ByteDance Seed for coding and long-horizon agent workflows. It is suited for end-to-end software delivery, multi-step task execution, and understanding visual and video content, with capabilities for planning, debugging, and self-correction.

Text262K context$0.50 / $2.50
Seed-2.0-Code

Seed 2.0 Code is a model from ByteDance Seed optimized for agentic coding. It is suited for frontend development, multilingual programming tasks, and coding-agent workflows in tools such as Claude Code, Kilo, and OpenCode.

Text262K context
Seed-2.0-Lite

Seed-2.0-Lite is a versatile, cost‑efficient enterprise workhorse that delivers strong multimodal and agent capabilities while offering noticeably lower latency, making it a practical default choice for most production workloads across text, vision, and tools. Engineered for high-frequency visual understanding and agentic workflows, it's an ideal choice for deployment at scale with minimal latency.

Text262K context$0.25 / $2
Seed-2.0-Mini

Seed-2.0-mini targets latency-sensitive, high-concurrency, and cost-sensitive scenarios, emphasizing fast response and flexible inference deployment. It delivers performance comparable to ByteDance-Seed-1.6, supports 256k context, four reasoning effort modes (minimal/low/medium/high), multimodal understanding, and is optimized for lightweight tasks where cost and speed take priority.

Text262K context$0.10 / $0.40
Seedream 4.5

Seedream 4.5 is the latest in-house image generation model developed by ByteDance. Compared with Seedream 4.0, it delivers comprehensive improvements, especially in editing consistency, including better preservation of subject details, lighting, and color tone. It also enhances portrait refinement and small-text rendering. The model’s multi-image composition capabilities have been significantly strengthened, and both reasoning performance and visual aesthetics continue to advance, enabling more accurate and artistically expressive image generation.

Pricing is $0.04 per output image, regardless of size.

Imagefrom $0.04/image
Seed 1.6 Flash

Seed 1.6 Flash is an ultra-fast multimodal deep thinking model by ByteDance Seed, supporting both text and visual understanding. It features a 256k context window and can generate outputs of up to 16k tokens.

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Seed 1.6

Seed 1.6 is a general-purpose model released by the ByteDance Seed team. It incorporates multimodal capabilities and adaptive deep thinking with a 256K context window.

Text262K context