ByteDance Models API - Access Seed and Seedream via AIsa

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.

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ByteDance Models API - Access Seed and Seedream via AIsa

Supported ByteDance models

Quickstart

Image route example

Common choices

Data privacy

Next

​Supported ByteDance models

​Quickstart

​Image route example

​Common choices

​Data privacy

​Next

Supported ByteDance models

Quickstart

Image route example

Common choices

Data privacy

Next