Doubao SEED 2.1 Pro API
Released June 28, 2026 as the replacement for the retired SEED 2.0 Pro. Doubao SEED 2.1 Pro pairs a 256K context window with 256K max output at roughly $0.83/$4.17 per 1M tokens, with cached input around $0.17.
💰 Save up to 70% vs official ByteDance pricingDoubao SEED 2.1 Pro — cheaper than the official ByteDance API
Access Doubao SEED 2.1 Pro through AI API Hub and pay less per token. Same OpenAI-compatible endpoint, lower cost.
Technical Specifications
| Provider | ByteDance |
| Model Family | Doubao SEED 2.1 Pro |
| Release Date | 2026-06 |
| Context Window | 256K |
| Max Output Tokens | 262,144 |
| Input Price | $0.83 / 1M tokens |
| Output Price | $4.17 / 1M tokens |
| Vision Support | Yes ✓ |
| Function Calling | No |
| JSON Mode | No |
| Streaming | Yes ✓ |
| Fine Tuning | Not Available |
| Status | Active ✓ |
Overview
Doubao SEED 2.1 Pro is ByteDance's current doubao model, released in 2026-06. Released June 28, 2026 as the replacement for the retired SEED 2.0 Pro. Doubao SEED 2.1 Pro pairs a 256K context window with 256K max output at roughly $0.83/$4.17 per 1M tokens, with cached input around $0.17.
For developers, the headline numbers are a 256K context window and up to 262,144 output tokens per response — enough headroom for newest doubao flagship and 256k in / 256k out without chunking your input. Priced at $0.83/1M input and $4.17/1M output, it sits in the budget tier — ideal for high-volume pipelines where token cost dominates.
On the capability side, Doubao SEED 2.1 Pro exposes 4 features: Vision, Chinese, Low Latency, Streaming. Note that fine-tuning isn't supported — you'll work with the base model. Vision support means you can pass images alongside text, handy for document parsing or UI automation.
The practical appeal of routing Doubao SEED 2.1 Pro through AI API Hub is simplicity: one OpenAI-compatible endpoint, USDT & USDC payments, no credit card, and you're calling the API in under 30 seconds — just swap your base URL.
What Makes Doubao SEED 2.1 Pro Different
How Doubao SEED 2.1 Pro is used
Doubao SEED 2.1 Pro is used for document understanding, image-based Q&A, OCR-free receipt/invoice parsing, and screenshot analysis. Route pure text workloads to a cheaper non-vision sibling — the vision capability adds cost that's wasted on text-only tasks.
Pricing position within ByteDance
Doubao SEED 2.1 Pro is the most expensive active model from ByteDance at $0.83/1M input — the premium tier. The cheapest sibling costs $0.03/1M (96% less). Reserve Doubao SEED 2.1 Pro for tasks where its capabilities justify the premium; route bulk traffic to cheaper siblings.
Doubao SEED 2.1 Pro's role in the lineup
Within ByteDance's lineup, Doubao SEED 2.1 Pro is the flagship — the most capable and most expensive option. It's part of the doubao family (4 active variants share this family). Use it when quality matters more than cost; switch to a cheaper sibling for high-volume or less demanding tasks.
Real-world use cases
Real-world deployments: OCR-free receipt and invoice parsing, screenshot analysis for support tickets, image-based content moderation, and visual Q&A for accessibility tools. Doubao SEED 2.1 Pro reads images directly — no separate OCR step needed.
vs sibling models
What makes Doubao SEED 2.1 Pro different from sibling models: compared to Doubao SEED 2.1 Turbo ($0.41/1M cheaper, same 256K context); Doubao SEED 2.0 Lite ($0.75/1M cheaper, 128K vs 256K context (smaller)); Doubao SEED 2.0 Mini ($0.80/1M cheaper, 128K vs 256K context (smaller)). Choose Doubao SEED 2.1 Pro when vision input is needed.
API Examples
Python
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://api.apiyihe.org/v1"
)
response = client.chat.completions.create(
model="doubao-seed-2.1-pro",
messages=[
{"role": "user", "content": "Hello"}
]
)
print(response.choices[0].message.content)JavaScript / Node.js
import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.API_KEY,
baseURL: "https://api.apiyihe.org/v1"
});
const response = await client.chat.completions.create({
model: "doubao-seed-2.1-pro",
messages: [
{ role: "user", content: "Hello" }
]
});
console.log(response.choices[0].message.content);cURL
curl https://api.apiyihe.org/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "doubao-seed-2.1-pro",
"messages": [
{"role": "user", "content": "Hello"}
]
}'Supported Features
| Vision / Image Input | ✅ Supported |
| Audio / Voice Input | ❌ Not Available |
| Function Calling | ❌ Not Available |
| JSON Mode | ❌ Not Available |
| Streaming | ✅ Supported |
| Fine-Tuning | ❌ Not Available |
| Multimodal | ❌ Not Available |
Benchmark Scores
| Benchmark | Score |
|---|---|
| MMLU | Not Publicly Available |
| GPQA | Not Publicly Available |
| SWE-Bench | Not Publicly Available |
| HumanEval | Not Publicly Available |
| GSM8K | Not Publicly Available |
| MATH | Not Publicly Available |
| MMMU | Not Publicly Available |
Pricing History
Doubao SEED 2.1 Pro was released in 2026-06 by ByteDance and is currently publicly available via AI API Hub.
Current Pricing: $0.83 per 1M input tokens · $4.17 per 1M output tokens. Pay-as-you-go with no minimum commitment.
Pricing Model: Token-based billing (pay per use). No subscription fees. No hidden costs.
💡 ByteDance occasionally updates pricing. AI API Hub reflects current pricing in real-time. All prices in USD. Pay with USDT or USDC — no currency conversion fees.
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Frequently Asked Questions
What is Doubao SEED 2.1 Pro?
Doubao SEED 2.1 Pro is ByteDance's current doubao model. Released June 28, 2026 as the replacement for the retired SEED 2.0 Pro. Doubao SEED 2.1 Pro pairs a 256K context window with 256K max output at roughly $0.83/$4.17 per 1M tokens, with cached input around $0.17. It offers a 256K context window and supports Vision, Chinese, Low Latency. You can access it through AI API Hub using USDT or USDC — no credit card required.
How much does Doubao SEED 2.1 Pro cost?
Doubao SEED 2.1 Pro is priced at $0.83 per 1M input tokens and $4.17 per 1M output tokens, billed pay-as-you-go with no minimum. Through AI API Hub you can start with as little as $5 and scale from there.
Doubao SEED 2.1 Pro vs GPT-6 Astra?
They're built for different jobs. Doubao SEED 2.1 Pro costs $0.83/1M input with a 256K window; GPT-6 Astra runs $10.00/1M input with 1M. Doubao SEED 2.1 Pro is the more cost-effective pick and still brings newest doubao flagship. See the full side-by-side at /compare/doubao-seed-2.1-pro-vs-gpt-6-astra/.
Doubao SEED 2.1 Pro context window?
Doubao SEED 2.1 Pro has a 256K context window, capable of processing up to 262,144 tokens in a single request. Maximum output tokens: 262,144.
Does Doubao SEED 2.1 Pro support function calling?
No, Doubao SEED 2.1 Pro does not natively support function calling. For function calling use cases, consider ByteDance's flagship models.
Is Doubao SEED 2.1 Pro multimodal?
Partially — Doubao SEED 2.1 Pro supports vision (image input) but not native audio processing.
Doubao SEED 2.1 Pro API rate limits?
Doubao SEED 2.1 Pro rate limits: 5K RPM. Higher tier plans offer increased throughput. For high-volume production use, consider ByteDance's faster variant models.
How to access Doubao SEED 2.1 Pro API?
Access Doubao SEED 2.1 Pro through AI API Hub: (1) Register at z.apiyihe.org/register?aff=ZVtr, (2) Deposit USDT/USDC, (3) Get your API key instantly, (4) Use the OpenAI-compatible endpoint https://api.apiyihe.org/v1 with model name "doubao-seed-2.1-pro". Start building in under 30 seconds.