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doubao · Balanced

Doubao Seed 2.1 Pro

Added Jun 23, 2026

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Use in the app

Higher-capability model in the Doubao Seed 2.1 family for agentic coding, long-context analysis, complex instruction following, and productivity workflows. Supports a 256k context window and up to 128k output tokens. Note: privacy and logging guarantees may be limited.

Input
Text
Output
Text
Discovery tier
Balanced

Pricing

USD per 1M tokens
Input
$1.00
Output
$5.00

Reference prices as published by the model provider. API example

Specifications

Context window
256K
Max output
128K
Average output (7 days)
2.7K tokens
Longer than 95% of 465 models

Side by side

Doubao Seed 2.1 Pro compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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Doubao Seed 2.1 ProdoubaoThis modelStep 5 PreviewstepfunRemove
Providerdoubaostepfun
Discovery tierBalancedBalanced
AddedJun 23, 2026Sep 20, 2026
Limits
Context window256K1MBest
Max output128KBest65.54K
Average output2.7K tokens1.5K tokens
Pricing, USD per 1M tokens
Input$1.00$1.00
Output$5.00$2.70Best
Cache read—$0.05
Performance
Request success (24h)—100.0%
Benchmark indexes
Intelligence Index—43.7
Capabilities
ReasoningNoYes
ToolsNoYes
VisionNoYes
Structured outputNoYes
Video inputNoYes
Parallel toolsNoYes
Reasoning effort—low, medium, high

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • Doubao Seed 2.1 Pro
  • Step 5 Preview

Intelligence Index

  • Doubao Seed 2.1 Pro—
  • Step 5 Preview43.7
3.8Catalog models by score55.1

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 51.0%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 17.7%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 1,423 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 1,587 Elo

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 14.8%

  • AA-LCRv1.1

    Reasoning across long documents

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 88.3%

  • MLCR-AA

    Long-context reasoning over medical records

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 18.3%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 46.5%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 33.3%

  • SciCode

    Scientific computing in Python

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 58.9%

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • Doubao Seed 2.1 Pro: —
    • Step 5 Preview: 88.3%

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Prompt cache hits
0.0%

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bytedance/doubao-seed-2.1-pro",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="bytedance/doubao-seed-2.1-pro",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

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