Seed 2.1 Turbo API

ByteDance Seed 2.1 Turbo is a multimodal model for coding and long-horizon agent workflows, accepting text, image and video input across a 256K context window.

Modalities
Image, TextText
In / Out price
$0.529/$2.65per 1M
Context window
256K tokens
Released
Aug 10, 2026

Seed 2.1 Turbo overview

The pelican test: one prompt, every text model, unedited SVG output from Nov 3, 2026.

SVG of a pelican riding a bicycle, written by Seed 2.1 Turbo through AI/ML API

Seed 2.1 Turbo specs

Model ID
bytedance-seed/seed-2-1-turbo
Developer
ByteDance
Context window
262,144 tokens
Max output
262,144 tokens
Input
Image, Text
Output
Text
API
OpenAI-compatible, base URL https://api.aimlapi.com/v1

ByteDance Seed 2.1 Turbo is a multimodal model for coding and long-horizon agent workflows, accepting text, image and video input across a 256K context window.

Use cases

High-value office work and complex everyday consultations, including multi-step tasks such as project planning, file processing, and tool use.

Code engineering workflows, including requirement understanding, coding, debugging, and validation in real development work.

Teaching, office, and research scenarios, such as generating lesson-plan slides, analyzing complex spreadsheets, and producing industry reports.

Capabilities

  • Reasoning
  • Streaming
  • Structured outputs
  • Function calling
  • Vision
  • Web search

Seed 2.1 Turbo API pricing

Seed 2.1 Turbo pricing in US dollars
UsagePriceUnit
Input$0.5291M tokens
Output$2.651M tokens

Prices from the AI/ML API price list, checked on Nov 4, 2026.

Seed 2.1 Turbo vs other models: token prices

AI/ML API input and output rates for 5 models, per million tokens.

AI/ML API model prices in USD per million tokens
ModelInputOutput
Seed 2.1 Turbo$0.529$2.65
Dola-Seed 2.0 Mini$0.1$0.4
Dola-Seed 2.0 Lite$0.25$2
Dola-Seed 2.0 Pro$0.5$3
Seed 2.0 Code$0.529$3.17

How to use the Seed 2.1 Turbo API

View docs

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key
export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"

2Make your first request

curl 'https://api.aimlapi.com/v1/chat/completions' \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "bytedance-seed/seed-2-1-turbo",
  "messages": [
    {
      "role": "user",
      "content": "Write a haiku about the ocean."
    }
  ]
}'

Related articles

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Seed 2.1 Turbo FAQ

What is the context window of Seed 2.1 Turbo?

Seed 2.1 Turbo has a 262,144 tokens context window and can return up to 262,144 tokens.

What inputs and outputs does Seed 2.1 Turbo support?

Seed 2.1 Turbo takes image, text as input and returns text.

What is the model ID for Seed 2.1 Turbo?

Use bytedance-seed/seed-2-1-turbo as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

When was Seed 2.1 Turbo released?

Seed 2.1 Turbo became available on August 10, 2026.

How much does Seed 2.1 Turbo cost?

Seed 2.1 Turbo costs $0.529 input and $2.65 output per 1M tokens on AI/ML API, billed as you go with no subscription.

Does Seed 2.1 Turbo support streaming?

Yes, Seed 2.1 Turbo can stream responses as they are generated.

Can Seed 2.1 Turbo read images?

Yes, Seed 2.1 Turbo accepts image input alongside text.

Who created Seed 2.1 Turbo?

Seed 2.1 Turbo was built by ByteDance.

What is Seed 2.1 Turbo best suited for?

It is designed for coding tasks and long-horizon agent workflows, handling text and image input.

Start building with Seed 2.1 Turbo

Seed 2.1 Turbo API

bytedance-seed/seed-2-1-turbo

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key
export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"

2Make your first request

curl 'https://api.aimlapi.com/v1/chat/completions' \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "bytedance-seed/seed-2-1-turbo",
  "messages": [
    {
      "role": "user",
      "content": "Write a haiku about the ocean."
    }
  ]
}'