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ByteDance Seed: Seedream 4.5

Source description (English)

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,...

View source on OpenRouter
Overview

Model specifications

Context
4,096 tokens
Maximum output
3,686 tokens
Architecture
text+image->image
Tokenizer
Other
Knowledge cutoff
Not provided
Moderated
No
OPENROUTER

Complete pricing

Synchronized OpenRouter rates. Token prices are shown per one million tokens.

Image output
$0.04
per image
Image input
Free
per image
API

Quick start

Set OPENROUTER_API_KEY locally. Python requires requests; JavaScript runs in Node.js. Keep the key on the server.

API documentation

curl --fail-with-body https://openrouter.ai/api/v1/images \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"bytedance-seed/seedream-4.5","prompt":"A sunlit mountain landscape"}'
Capabilities

Input → Output

Input
imagetext
Output
image
API

Supported API parameters

frequency_penaltymax_tokenstemperaturetop_p
Available providers

1 Provider

Checked: September 7, 2026

Live providers on OpenRouter

Provider availability, latency, throughput and routing can change continuously. Open the source page for current operational data.

OpenRouter

Seed

Not provided
Context
4K
Maximum output
4K
bytedance-seed

4 models

All models
bytedance-seed logobytedance-seed

ByteDance Seed: 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...

Context
Not provided
Input
text · image
Output
image
Image input: Free per imageImage output: $0.035 per image
View model details →
bytedance-seed logobytedance-seed

ByteDance Seed: 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.

Context
Not provided
Input
text · image
Output
image
Image input: $0.003 per imageImage output: $0.045 per image
View model details →
bytedance-seed logobytedance-seed

ByteDance Seed: 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...

Context
262K
Input
text · image · video
Output
text
Input: $0.5Output: $2.5per 1M tokens
View model details →
bytedance-seed logobytedance-seed

ByteDance Seed: 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...

Context
262K
Input
text · image · video
Output
text
Input: $0.5Output: $3per 1M tokens
View model details →