ByteDance Models API - Access Seed and Seedream via AIsa

Current AIsa guide to ByteDance Seed and Seedream model IDs, context windows, capabilities, endpoints, and prices, including Seed 1.x, Seed 2.0, Seedream 4.5, and Seedream 5.0 routes through BytePlus.

AIsa routes ByteDance Seed and Seedream models through BytePlus, ByteDance’s official international enterprise platform. Use one AIsa API key for Seed text/vision/video/coding models and Seedream image models.

Seed text/vision/video-understanding models use POST /v1/chat/completions (most also accept Anthropic-compatible POST /v1/messages). seedream-5-0-260128 uses POST /v1/images/generations and seedream-4-5-251128 uses POST /v1/chat/completions; both are billed per request. Dreamina Seedance video models are asynchronous through POST /v1/video/generations.

Supported ByteDance models

Model ID	Context	Capabilities	Price	Best for
seed-1-6-250915	262,144	Text, Video, Vision	$0.2250 in / $0.9000 out per 1M	Stable general Seed route
seed-1-6-flash-250715	262,144	Text, Video, Vision	$0.0675 in / $0.2700 out per 1M	Fast, low-cost throughput
seed-1-8-251228	262,144	Coding, Text, Video, Vision	$0.2250 in / $1.8000 out per 1M	Stronger agentic and coding tasks
seed-2-0-mini-260215	262,144	Coding, Text, Video, Vision	$0.1000 in / $0.4000 out per 1M	Low-cost Seed 2.0 route
seed-2-0-lite-260228	262,144	Coding, Text, Video, Vision	$0.2500 in / $2.0000 out per 1M	Balanced Seed 2.0 route
seed-2-0-pro-260328	262,144	Coding, Text, Video, Vision	$0.5000 in / $3.0000 out per 1M	Strongest Seed 2.0 route
seedream-4-5-251128	N/A	Image, Vision	$0.036/request	Image generation and editing
seedream-5-0-260128	262,144	Image, Vision	$0.035/request	Newer Seedream image route
dreamina-seedance-2-0-260128	—	Video	$4.30/1M tokens (480p/720p/4k), $4.70/1M tokens (1080p)	Dreamina Seedance video generation
dreamina-seedance-2-0-fast-260128	—	Video	$3.30/1M tokens (480p/720p)	Faster, lower-cost Seedance video route

The date suffix in each model string is a release/version stamp in YYMMDD format, useful when pinning a production route. Dreamina Seedance video models are asynchronous: submit the job to POST /v1/video/generations, then poll /v1/video/generations/{task_id}. A — in the Context column means the current gateway metadata does not publish that model’s context window.

Quickstart

from openai import OpenAI

client = OpenAI(api_key="YOUR_AISA_API_KEY", base_url="https://api.aisa.one/v1")

response = client.chat.completions.create(
    model="seed-2-0-pro-260328",
    messages=[{"role": "user", "content": "Analyze this product requirements document and identify implementation risks."}]
)
print(response.choices[0].message.content)

Image route example

response = client.chat.completions.create(
    model="seedream-5-0-260128",
    messages=[
        {"role": "user", "content": "Create a clean product image of a glass water bottle on a white marble surface."}
    ]
)

Common choices

Need	Use
Lowest-cost Seed route	seed-1-6-flash-250715 or seed-2-0-mini-260215
Strongest Seed text/coding route	seed-2-0-pro-260328
Stable Seed 1.x route	seed-1-6-250915
Image generation/editing	seedream-5-0-260128 or seedream-4-5-251128
Video generation	dreamina-seedance-2-0-260128 or dreamina-seedance-2-0-fast-260128

Data privacy

ByteDance Seed and Seedream requests are routed through BytePlus enterprise infrastructure. For compliance and data residency requirements, contact us.

Next

• All Chinese AI models
• Qwen and Wan models
• All supported AIsa models