doubao · Efficient

Doubao Seed Character

Added Jul 18, 2026

ByteDance's character-focused Doubao Seed model for roleplay, persona consistency, dialogue, and creative character interactions. It supports text and image input with a 128k context window. Requests route through ZenMux to ByteDance; ZenMux does not publish a model-API zero-retention or training guarantee, so avoid sensitive data.

Reasoning
Vision

Input: Text, Images
Output: Text
Reasoning effort: none · high
Discovery tier: Efficient

Pricing

USD per 1M tokens

Input: $0.15
Output: $0.37
Cache read: $0.03
Cache write: $0.003

Reference prices as published by the model provider. API example

Specifications

Context window: 128K
Max output: 32.8K
Average output (7 days): 215 tokens; Longer than 23% of 465 models

Side by side

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TryMiniMax M3.1 Flash Ultramarine 1 Flash Perceptron Mk1.5 All 3

Public evaluations

Benchmarks

There are no public benchmark results for Doubao Seed Character yet.

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Throughput: 61.5 tok/s; Faster than 42% of 250 models
Time to first token: 2.9 s; Quicker than 60% of 250 models
Prompt cache hits: 68.3%; About $0.068 per 1M input tokens with caching
Request success (24h): 100.0%; Reliable

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Hourly request success · last 72 hoursLowest hour 98.8%

Healthy (98% or more)
Degraded (90–98%)
Down (under 90%)
No requests

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/doubao-seed-character",
    "reasoning_effort": "none",
    "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/doubao-seed-character",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

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