ByteDance Doubao Compatible Endpoint

Upmore is compatible with the Volcengine Ark Chat API. If you’re already using the Ark SDK or calling the Ark API directly, switching to Upmore requires only a base URL change — no code rewrite needed.

Endpoints

POST https://api.upmore.net/v1/chat/completions
POST https://api.upmore.net/v1/responses

Authentication

Authorization: Bearer YOUR_API_KEY

Supported models

Model	Description
doubao-seed-2.0-pro	Doubao Seed 2.0 Pro — most capable
doubao-seed-2.0-code	Doubao Seed 2.0 Code — optimized for coding
doubao-seed-2.0-lite	Doubao Seed 2.0 Lite — balanced
doubao-seed-2.0-mini	Doubao Seed 2.0 Mini — fast and lightweight
doubao-seed-1-8-251228	Doubao Seed 1.8
doubao-seed-1-6-flash-250828	Doubao Seed 1.6 Flash — fast inference
doubao-seed-1-6-251015	Doubao Seed 1.6
doubao-seed-1-6-lite-251015	Doubao Seed 1.6 Lite
doubao-seed-1-6-vision-250815	Doubao Seed 1.6 Vision — multimodal
glm-4.7	GLM-4-7

Supported input types

Content	Chat API `type`	Chat API data field	Responses API `type`	Responses API data field
Text	`text`	`text`	`input_text`	`text`
Image	`image_url`	`image_url.url`	`input_image`	`image_url` (string)
Video	`video_url`	`video_url.url` + `video_url.fps`	`input_video`	`video_url` (string) + `fps`
Document	—	—	`input_file`	`file_url` or `file_data` + `filename`

All content types support both URL and Base64 data URI formats.

Features

Streaming — Set stream: true for real-time token streaming via SSE
Function calling — Use the tools and tool_choice parameters
Reasoning — Models return reasoning_content with chain-of-thought
Vision — Send images via image_url / input_image content blocks
Video understanding — Send videos via video_url / input_video with optional fps control
Document understanding — Send PDF/documents via input_file (Responses API only)
Multi-turn conversations — Include full message history in messages / input

Chat Completions API

Text

curl https://api.upmore.net/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-2.0-pro",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'

from volcenginesdkarkruntime import Ark

client = Ark(
    api_key="YOUR_API_KEY",
    base_url="https://api.upmore.net/v1"
)

response = client.chat.completions.create(
    model="doubao-seed-2.0-pro",
    messages=[
        {"role": "user", "content": "Hello!"}
    ]
)
print(response.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "YOUR_API_KEY",
  baseURL: "https://api.upmore.net/v1",
});

const response = await client.chat.completions.create({
  model: "doubao-seed-2.0-pro",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

Image (URL)

cURL

curl https://api.upmore.net/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-1-6-251015",
    "messages": [
      {
        "role": "user",
        "content": [
          {"type": "image_url", "image_url": {"url": "https://example.com/photo.jpg"}},
          {"type": "text", "text": "What is in this image?"}
        ]
      }
    ],
    "max_tokens": 100
  }'

Image (Base64)

cURL

curl https://api.upmore.net/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-1-6-251015",
    "messages": [
      {
        "role": "user",
        "content": [
          {"type": "image_url", "image_url": {"url": "data:image/png;base64,{BASE64_IMAGE}"}},
          {"type": "text", "text": "What is in this image?"}
        ]
      }
    ]
  }'

Video (URL + fps)

The fps parameter controls frame extraction rate (frames per second). Default: 1, range: 0.2–5.

cURL

curl https://api.upmore.net/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-1-6-251015",
    "messages": [
      {
        "role": "user",
        "content": [
          {"type": "video_url", "video_url": {"url": "https://example.com/clip.mp4", "fps": 2}},
          {"type": "text", "text": "What buildings appear in this video?"}
        ]
      }
    ],
    "max_tokens": 200
  }'

Video (Base64)

cURL

curl https://api.upmore.net/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-1-6-251015",
    "messages": [
      {
        "role": "user",
        "content": [
          {"type": "video_url", "video_url": {"url": "data:video/mp4;base64,{BASE64_VIDEO}"}},
          {"type": "text", "text": "What is in this video?"}
        ]
      }
    ]
  }'

Responses API

Text

cURL

curl https://api.upmore.net/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-2.0-pro",
    "input": "Hello!"
  }'

Image (URL)

cURL

curl https://api.upmore.net/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-1-6-251015",
    "input": [
      {
        "role": "user",
        "content": [
          {"type": "input_image", "image_url": "https://example.com/photo.jpg"},
          {"type": "input_text", "text": "What is in this image?"}
        ]
      }
    ]
  }'

Video (URL + fps)

cURL

curl https://api.upmore.net/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-1-6-251015",
    "input": [
      {
        "role": "user",
        "content": [
          {"type": "input_video", "video_url": "https://example.com/clip.mp4", "fps": 1},
          {"type": "input_text", "text": "What is in this video?"}
        ]
      }
    ]
  }'

Document (URL)

Document understanding is only available via the Responses API.

cURL

curl https://api.upmore.net/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-2.0-lite",
    "input": [
      {
        "role": "user",
        "content": [
          {"type": "input_file", "file_url": "https://example.com/document.pdf"},
          {"type": "input_text", "text": "Summarize this document"}
        ]
      }
    ]
  }'

Document (Base64)

cURL

curl https://api.upmore.net/v1/responses \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-2.0-lite",
    "input": [
      {
        "role": "user",
        "content": [
          {"type": "input_file", "file_data": "data:application/pdf;base64,{BASE64_PDF}", "filename": "document.pdf"},
          {"type": "input_text", "text": "Summarize this document"}
        ]
      }
    ]
  }'

fps parameter

fps	Use case
0.2–0.5	Static scenes, surveillance footage
1 (default)	General purpose
2–5	Fast action, sports, motion counting

File size limits

Method	Image	Video	Document
URL	< 10 MB	< 50 MB	< 50 MB
Base64	< 10 MB (body < 64 MB)	< 50 MB (body < 64 MB)	< 50 MB (body < 64 MB)

Streaming example

stream = client.chat.completions.create(
    model="doubao-seed-2.0-pro",
    messages=[
        {"role": "user", "content": "Write a short poem"}
    ],
    stream=True
)

for chunk in stream:
    if chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="")

Getting started

Native Compatible Endpoints

Model APIs

ByteDance Doubao Compatible Endpoint

Endpoints

Authentication

Supported models

Supported input types

Features

Chat Completions API

Text

Image (URL)

Image (Base64)

Video (URL + fps)

Video (Base64)

Responses API

Text

Image (URL)

Video (URL + fps)

Document (URL)

Document (Base64)

fps parameter

File size limits

Streaming example

​Endpoints

​Authentication

​Supported models

​Supported input types

​Features

​Chat Completions API

​Text

​Image (URL)

​Image (Base64)

​Video (URL + fps)

​Video (Base64)

​Responses API

​Text

​Image (URL)

​Video (URL + fps)

​Document (URL)

​Document (Base64)

​fps parameter

​File size limits

​Streaming example

Endpoints

Authentication

Supported models

Supported input types

Features

Chat Completions API

Text

Image (URL)

Image (Base64)

Video (URL + fps)

Video (Base64)

Responses API

Text

Image (URL)

Video (URL + fps)

Document (URL)

Document (Base64)

fps parameter

File size limits

Streaming example