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ByteDance Seed 2.1 Turbo

Added Aug 12, 2026

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Use in the app

ByteDance Seed 2.1 Turbo is a multimodal model for coding and long-horizon agent workflows, including end-to-end software delivery and multi-step task execution. It supports text, image, and video input with a 262k context window.

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • Video input
Input
Text, Images, Video
Output
Text
Discovery tier
Balanced

Pricing

USD per 1M tokens
Input
$0.50
Output
$2.50

Reference prices as published by the model provider. API example

Specifications

Context window
262.1K
Max output
—
Average output (7 days)
257 tokens
Longer than 27% of 468 models

Side by side

ByteDance Seed 2.1 Turbo compared

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

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ByteDance Seed 2.1 TurbodoubaoThis modelMiniMax M1 80KMiniMaxRemove
ProviderdoubaoMiniMax
Discovery tierBalancedBalanced
AddedAug 12, 2026Jan 8, 2025
Limits
Context window262.14K1MBest
Max output—131.07K
Average output257 tokens—
Pricing, USD per 1M tokens
Input$0.50Best$0.61
Output$2.50$2.42Best
Benchmark indexes
Intelligence Index—11.7
Math Index—61.0
Capabilities
ReasoningYesNo
ToolsYesNo
VisionYesNo
Structured outputYesNo
Video inputYesNo
Reasoning effort——

Public evaluations

Benchmarks

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

  • ByteDance Seed 2.1 Turbo
  • MiniMax M1 80K

Intelligence Index

  • ByteDance Seed 2.1 Turbo—
  • MiniMax M1 80K11.7
3.8Catalog models by score55.1

Indexes

  • Math Index

    Composite of the math evaluations

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 61.0

Document reasoning

  • AA-LCRv1.1

    Reasoning across long documents

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 57.7%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 8.9%

  • GPQA Diamond

    Graduate-level science questions

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 69.7%

  • MMLU-Pro

    Multi-subject knowledge and reasoning

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 81.6%

  • IFBench

    Following precise output instructions

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 41.8%

Coding

  • LiveCodeBench

    Recent competitive programming problems

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 71.1%

Math

  • AIME 2025

    Competition mathematics, 2025 problems

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 61.0%

  • AIME

    Competition mathematics

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 84.7%

  • MATH-500

    Competition math problems

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 98.0%

Legacy evaluations

  • Terminal-Bench Hard

    Earlier terminal task suite

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 3.0%

  • τ²-Bench Telecom

    Tool use in a customer-support simulation

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 34.2%

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • ByteDance Seed 2.1 Turbo: —
    • MiniMax M1 80K: 57.7%

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

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-seed/seed-2-1-turbo",
    "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-seed/seed-2-1-turbo",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

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