Seed-2.1-Pro

Name: ByteDance Seed-2.1-Pro
Price: 0.890208 USD
Availability: InStock
Author: ByteDance

bytedance/seed-2.1-pro

Seed 2.1 Pro is the larger of the two models in ByteDance Seed's Seed2.1 family, offered as Doubao-Seed-2.1-Pro through Doubao and Volcano Engine. ByteDance built Seed2.1 for real-world productivity: multi-step general agent work such as planning, document processing and tool use, end-to-end coding from requirement analysis to validation, and computer-use tasks. It also brings strong image, document and long-video understanding, and Seed 2.1 Turbo is the smaller sibling.

Use in agent Get API key

Input price: $0.89USD / 1M tokens
Output price: $4.45USD / 1M tokens
Context window: 1M
Max output: 262.1K

Production route

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Playground

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Input⌘ / Ctrl + Enter

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Prompt

Image URL or upload

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1M context262.1K max outputVision

Input$0.89/MOutput$4.45/MCache read$0.18/M

OutputReady

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Choose an example or write a prompt, then click Run.

Model card

Specifications

Pricing

Input: $0.89 / 1M tokens
Output: $4.45 / 1M tokens
Cache read: $0.18 / 1M tokens

Context & modalities

Context window: 1,048,576 tokens
Max output: 262,144 tokens
Input: Text, image
Output: Text

Capabilities

Chat: Supported
Vision: Supported
Reasoning: Supported
Structured output: Supported
Function calling: Supported
Audio input: Not supported

Access

Provider: ByteDance
Model ID: bytedance/seed-2.1-pro
Execution: sync
Base URL: https://api.sandbase.ai
API: Chat Completions API
Endpoint: /v1/chat/completions

Start building

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

Production API

Chat Completions API endpoint

https://api.sandbase.ai/v1/chat/completions

Model ID

bytedance/seed-2.1-pro

# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/chat/completions" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "bytedance/seed-2.1-pro",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ],
  "max_tokens": 2048
}
SANDBASE_JSON
)
printf '%s\n' "$result"

Choose your model

Compare models

All language models

Model	Context	Input / 1M	Output / 1M	Released
Seed-2.1-ProThis model `ByteDance`	1M	$0.89	$4.45	Sep 16, 2026
Seedream 5.0 Flash Text to Image `ByteDance`	—	—	—	Sep 15, 2026
Seedream 5.0 Flash Edit `ByteDance`	—	—	—	Sep 15, 2026
Seedream 5.0 Pro Edit `ByteDance`	—	—	—	Jul 8, 2026
Seedream 5.0 Pro Text to Image `ByteDance`	—	—	—	Jul 8, 2026
Seedance 2.5 Image to Video `ByteDance`	—	—	—	Jul 1, 2026

Questions

FAQ

How do I call ByteDance Seed-2.1-Pro through SandBase?

Create a SandBase API key, then send requests with the model ID "bytedance/seed-2.1-pro" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

How much does ByteDance Seed-2.1-Pro cost?

$0.89 per 1M input tokens and $4.45 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

What is the context window of ByteDance Seed-2.1-Pro?

1M tokens of context, with up to 262.1K output tokens per response.

Which features does ByteDance Seed-2.1-Pro support?

ByteDance Seed-2.1-Pro supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.

Do I need a separate ByteDance account?

No. One SandBase API key and balance gives you access to ByteDance Seed-2.1-Pro and the other models in the catalog; you do not need to sign up with ByteDance separately.