MODELS / BYTEDANCE

Bytedance Seed 1.8

Bytedance Seed 1.8 features stronger multimodal understanding and agent capabilities. The model delivers superior performance across a wide range of complex real-world tasks, helping enterprises create greater value.

START BUILDING COMPARE

TEXTREASONINGREASONINGTOOL-USEVISION

256K

CONTEXT WINDOW

64K

MAX OUTPUT TOKENS

$0.25

INPUT PRICE / 1M TOKENS

OUTPUT PRICE / 1M TOKENS

QUICKSTART

Call it in one request.

OpenAI-compatible: change the base URL, and the setup is complete.

curl https://enterprise.blackbox.ai/v1/chat/completions \
  -H "Authorization: Bearer $BLACKBOX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "blackboxai/bytedance/seed-1.8",
    "messages": [{ "role": "user", "content": "Hello!" }],
    "stream": true
  }'

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ.get("BLACKBOX_API_KEY"),
    base_url="https://enterprise.blackbox.ai/v1",
)

stream = client.chat.completions.create(
    model="blackboxai/bytedance/seed-1.8",
    messages=[{"role": "user", "content": "Hello!"}],
    stream=True,
)

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

import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: process.env.BLACKBOX_API_KEY,
  baseURL: 'https://enterprise.blackbox.ai/v1',
});

const stream = await client.chat.completions.create({
  model: 'blackboxai/bytedance/seed-1.8',
  messages: [{ role: 'user', content: 'Hello!' }],
  stream: true,
});

for await (const chunk of stream) {
  process.stdout.write(chunk.choices[0]?.delta?.content || '');
}

SPECIFICATIONS

The full spec sheet.

Context, pricing, modalities, routing, and deployment: everything Bytedance Seed 1.8 supports, in one table.

MODEL ID: blackboxai/bytedance/seed-1.8
DEVELOPED BY: ByteDance
MODEL TYPE: Text
RELEASED: Sep 1, 2025
CONTEXT WINDOW: 256K
MAX OUTPUT TOKENS: 64K
INPUT MODALITIES: text, image
OUTPUT MODALITIES: text
INPUT PRICE: $0.25 / 1M tokens
OUTPUT PRICE: $2 / 1M tokens
INPUT PRICE (>200K): $0.5 / 1M tokens
CACHE READ: $0.05 / 1M tokens
REASONING: Supported
DATA RETENTION: Standard retention
DEDICATED DEPLOYMENT: Not available (closed-weight model)
SUPPORTED PARAMETERS: max_tokenstemperaturestoptoolstool_choicereasoninginclude_reasoning

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BYTEDANCE

Seed 1.6

256K context · $0.25 / 1M tokens input · $2 / 1M tokens output