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ByteDance: Seed 2.1 Pro API

seed-2.1-pro
Playground

Seed 2.1 Pro API is a ByteDance multimodal model with text and image input and a 262K context. Its relatively small 5% discount makes benchmark behavior and official price more important than the savings headline. [1]

Seed 2.1 Pro API — LLM2014 logic 2026-08: Doubao-Seed-2.1-pro (high) ranks #18 with a 45.78 median, 55.12 best score, and 2026s average time; Doubao-Seed-2.1-pro (standard) ranks #45 with a 6.17 median, 13.03 best score, and 319s average time. Configurations are separate. [1][2]

MODALITIES
Price$0.855 / $4.275 / 1MCONTEXT262.144K

Playground

Try Seed 2.1 Pro in the API Need Playground.

Provider

Current API Need routing and live API pricing. [1]

API Need5% off
Uptime
Total Context
262.144K
Max Output
262.144K
Input
$0.855/ 1M
Output
$4.275/ 1M
Cache Read
$0.171/ 1M
Cache Write
Route priced

Pricing

Pricing uses the current live API Need configuration for this model.

Official
Provider baseline
Input $0.9/ 1MOutput $4.5/ 1M
Baseline
APINEED5% off
Prepaid credits
Input $0.855/ 1MOutput $4.275/ 1M

Availability

Recent public performance data for this model.

API statusLive metrics
API Need gateway99.05% uptime

Benchmarks

Editorial benchmark data is shown when this model has a verified match. [2]Intelligence uses the source’s median-score ranking. Efficiency views are APINEED calculations, not official LLM2014 rankings. Test costs and reference prices are converted at ¥7 per US dollar; they are not APINEED selling prices. Missing values are N/A. These results describe the source’s tested configurations, not guaranteed APINEED endpoint performance.

1stGPT-5.5 (xhigh)80.2373.897.9%534s33,219$27.51$29.57
2ndGPT-5.6 Sol (xhigh)78.3769.4211.42%381s17,769$14.71$29.57
3rdKimi-K3 (max)75.7767.6610.7%1144s41,432$17.40$15.00
4thClaude Opus 5 (xhigh)71.2464.749.12%437s26,705$18.43$24.64
5thGLM-5.3 (max)74.4863.9114.19%1009s57,408$6.43$4.00
6thGLM-5.3-Flash (max)69.5560.5212.98%863s38,787$0.22$0.20
7thQwen3.8-Max (xhigh)64.6860.057.16%1297s65,135$9.38$5.14
8thDeepSeek V4 Pro 0813(max)70.1359.6314.97%1601s73,350$7.92$3.86
9thDeepSeek-V4-Flash-Vision-Exp (max)62.8658.107.57%974s79,420$2.86$1.29
10thGemini 3.7 Flash (high)66.6257.5613.6%131s26,596$2.75$3.70
11thGrok 4.6 (high)67.9356.4116.96%813s33,807$5.60$5.91
12thGemini 3.1 Pro (high)69.3555.8419.48%235s28,338$9.39$11.83
13thDeepSeek V4 Flash 0731 (max)66.3455.2316.75%881s74,657$2.69$1.29
14thGLM-5.2 (max)66.5354.7017.78%891s46,273$5.18$4.00
15thQwen3.8-Flash (xhigh)65.4454.4916.73%844s64,942$0.70$0.39
16thGPT-5.6 Luna (xhigh)65.9251.6221.69%247s37,885$1.25$1.18
17thQwen3.8-27B (xhigh)58.4847.6518.52%2318s73,987$3.55$1.71
18thDoubao-Seed-2.1-pro (high)55.1245.7816.94%2026s85,238$10.23$4.29
19thMuse Spark 1.2 (xhigh)57.9345.1422.08%359s47,209$5.54$4.19
20thGemini 3.7 Flash (low)53.5044.0617.64%59s10,673$1.10$3.70
21stClaude Sonnet 5 (xhigh)47.8039.5717.22%545s45,066$12.44$9.86
22ndTencent Hy3 (high)57.8939.5131.75%1076s53,214$0.85$0.57
23rdQwen3.7-Plus (high)51.3638.7424.57%1254s58,610$1.88$1.14
24thMiniMax-M343.8337.3714.74%982s57,486$1.93$1.20
25thDoubao-Seed-2.0-lite 0428 (high)34.1326.1823.29%669s27,845$0.40$0.51
26thClaude Opus 534.9424.5829.65%156s10,261$7.08$24.64
27thGemini 3.5 Flash Lite (high)29.5120.4430.74%192s17,842$1.23$2.46
28thLing-3.0-flash28.3717.0539.9%735s95,538N/AN/A
29thGemma 4 31B21.3616.0924.67%756s15,290$0.17$0.39
30thopenPangu-2.0-Pro20.0215.7521.33%645s28,215$1.64$2.07
31stQwen3.7-Plus20.8415.6325%323s8,910$0.29$1.14
32ndGPT-5.5 Instant21.7314.0935.16%28s1,712$1.42$29.57
33rdMistral Medium 3.517.2513.8719.59%200s28,129$5.82$7.39
34thStep-3.7-Flash26.1813.7447.52%282s47,180$1.53$1.16
35thMiMo-V2.5-Pro26.3113.0050.59%550s33,095$0.79$0.86
36thDots3-Note Preview18.6312.9530.49%210s28,386N/AN/A
37thERNIE 5.116.3211.3230.64%468s24,522$1.77$2.57
38thQwen3.8-27B16.4810.6135.62%192s8,914$0.43$1.71
39thopenPangu-2.0-Flash19.2410.1647.19%583s29,052$0.19$0.23
40thLongCat-2.017.619.7444.69%374s14,273$0.46$1.14
41stClaude Sonnet 516.499.6741.36%113s6,175$1.70$9.86
42ndGLM-5.212.428.0535.19%24s929$0.10$4.00
43rdDeepSeek V4 Flash 073113.577.9341.56%53s4,621$0.17$1.29
44thGemini 3.1 Flash Lite9.017.1121.09%11s707$0.03$1.48
45thDoubao-Seed-2.1-pro13.036.1752.65%319s6,948$0.83$4.29
46thMistral Medium 3.58.455.9329.82%18s2,589$0.54$7.39

Quick Start

Call Seed 2.1 Pro with its real backend model ID.

1

Get an API key

Create an API key in the product app.

export API_NEED_API_KEY=sk-apineed-v1-...
2

Send a request

Call /v1/chat/completions with model seed-2.1-pro.

TypeScript SDKPythoncURLOpenAI SDK
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.API_NEED_API_KEY,
  baseURL: "https://apineed.com/v1"
});

const result = await client.chat.completions.create({
  model: "seed-2.1-pro",
  messages: [
    { role: "user", content: "Why is the sky blue?" }
  ]
});

console.log(result.choices[0].message.content);
3

Handle the response

Validate responses and errors in your application.

curl https://apineed.com/v1/chat/completions \
  -H "Authorization: Bearer $API_NEED_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "seed-2.1-pro",
  "stream": true,
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'

Endpoints

Endpoints currently returned by the live pricing API.

POST/v1/responses
Authorization
Bearer $API_NEED_API_KEY
Content-Type
application/json
HTTP-Referer
optional - your site URL, for rankings
X-Title
optional - your site name, for rankings
Model
seed-2.1-pro
POST/v1/chat/completions
Authorization
Bearer $API_NEED_API_KEY
Content-Type
application/json
HTTP-Referer
optional - your site URL, for rankings
X-Title
optional - your site name, for rankings
Model
seed-2.1-pro

Parameters

Supported parameters are shown when verified metadata is available. [1]

No verified parameter metadata is currently available.

Seed 2.1 Pro API Q&A

Model-specific answers for teams comparing Seed 2.1 Pro API on capability, benchmark evidence, integration, and cost.

Is the Seed 2.1 Pro API discount 15%?

No. The current APINEED discount is 5%, based on $0.90 input and $4.50 output official rates.

Why are two Seed benchmark rows shown for Seed 2.1 Pro API?

Seed 2.1 Pro — LLM2014 logic 2026-08: Doubao-Seed-2.1-pro (high) ranks #18 with a 45.78 median, 55.12 best score, and 2026s average time; Doubao-Seed-2.1-pro (standard) ranks #45 with a 6.17 median, 13.03 best score, and 319s average time. Configurations are separate.

Can Seed 2.1 Pro API analyze images?

Yes. Its input modalities are text and image, with text output.

What should interactive apps test first for Seed 2.1 Pro?

For Seed 2.1 Pro API, measure real response latency and compare reasoning modes on representative multimodal prompts before selecting interactive defaults.

Which endpoint serves Seed 2.1 Pro API?

Call Seed 2.1 Pro API through https://apineed.com/v1/chat/completions with seed-2.1-pro as the model value. Existing OpenAI SDK clients usually need only the APINEED base URL and key.

How do I validate Seed 2.1 Pro API before release?

Evaluate Seed 2.1 Pro API on representative prompts, record quality, latency, and token use, then choose reasoning settings and fallbacks from those results.

How to deploy Seed 2.1 Pro

Connect the live model to your application.

1

Top up

Add usage credit in the product app.

2

Create a key

Create and securely store an API key.

3

Configure the endpoint

Send requests to /v1/chat/completions.

4

Monitor responses

Track status, latency, and errors in your application.

Use seed-2.1-pro in your application.

More live models

Seed 2.1 Turbobytedance/seed-2.1-turboSeedance 2.0 Spicybytedance/seedance-2.0-spicySeedance 2.5bytedance/seedance-2.5Seedance 2.0 (Real Face)bytedance/seedance-2.0