Doubao Seed 2.1 Pro - Upmore

Doubao Seed 2.0 Pro is a chat model available through Upmore via an OpenAI-compatible interface. ByteDance’s flagship Seed 2.0 Pro model with the strongest reasoning capabilities.

Key capabilities

OpenAI-compatible — Works as a drop-in replacement with the OpenAI SDK
Strongest Reasoning — Best-in-class for complex, multi-step tasks
Deep Analysis — Excels at research, planning, and detailed problem solving
Streaming — Supports real-time token streaming via SSE

Quick example

curl https://api.upmore.net/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seed-2-1-pro",
    "messages": [
      { "role": "user", "content": "Explain quantum entanglement in simple terms." }
    ]
  }'

from openai import OpenAI

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

response = client.chat.completions.create(
    model="doubao-seed-2-1-pro",
    messages=[
        {"role": "user", "content": "Explain quantum entanglement in simple terms."}
    ]
)

print(response.choices[0].message.content)

from openai import OpenAI

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

stream = client.chat.completions.create(
    model="doubao-seed-2-1-pro",
    messages=[
        {"role": "user", "content": "Write a short poem about the sea."}
    ],
    stream=True
)

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

Parameters

Parameter	Type	Required	Description
`model`	string	Yes	Must be `doubao-seed-2.0-pro`
`messages`	array	Yes	List of `{ role, content }` objects
`max_tokens`	integer	No	Maximum tokens to generate
`temperature`	float	No	`0`–`2`. Controls randomness. Default: `1`
`stream`	boolean	No	Enable SSE streaming. Default: `false`
`top_p`	float	No	Nucleus sampling threshold. Default: `1`
`stop`	string / array	No	Sequences that stop generation