What is the context window of Doubao Seed 2.1 Pro by NanoGPT?

Doubao Seed 2.1 Pro by NanoGPT has a context window of 256K tokens. It supports up to 256K input tokens and can generate up to 128K output tokens.

What input and output types does Doubao Seed 2.1 Pro support?

Doubao Seed 2.1 Pro by NanoGPT accepts text as input and can generate text as output.

Is Doubao Seed 2.1 Pro by NanoGPT open source?

No, Doubao Seed 2.1 Pro by NanoGPT has closed weights. The model is only available through the NanoGPT API.

Back to Models

Doubao Seed 2.1 Pro API

NanoGPT

About

Process massive datasets with Doubao Seed 2.1 Pro, featuring an expansive 256K context window for long-document analysis. This model delivers cost-effective pricing at $1.00/1M input and $5.00/1M output tokens. Access Doubao Seed 2.1 Pro via the NanoGPT API with up to 128K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text

Reasoning

Structured Output

Tool Use

WeightsClosed

Temperature

Fixed

Attachment

Not Supported

Limits

Context Window

256K

Tokens

Input Limit

256K

Tokens

Max Output

128K

Tokens

Pricing

Standard (per 1M tokens)

Input

$1.00

Output

$5.00

Caching (per 1M tokens)

Read

$0.50

Frequently Asked Questions

Doubao Seed 2.1 Pro by NanoGPT costs $1.00 per 1M input tokens and $5.00 per 1M output tokens. Cached reads cost $0.50 per 1M tokens.

Model Details

bytedance/doubao-seed-2.1-pro

Provider

NanoGPT

Family

seed

Release Date

Jun 23, 2026

Knowledge Cutoff

N/A

API Integration

NPM Package

@ai-sdk/openai-compatible

Environment Variables

NANO_GPT_API_KEY

API Base URL

https://nano-gpt.com/api/v1

Documentation