Seed 1.6 Flash

by ByteDance

Zero data retentionRetiring
bytedance-seed/seed-1.6-flash
Input
$0.10/1M tokens
Output
$0.42/1M tokens
Context
262Ktokens
Max output
33Ktokens
Knows to
-
Released
23 Dec 2025

Scheduled for retirement on 11 Nov 2026. Requests to bytedance-seed/seed-1.6-flash will stop working after that date; the comparisons below are a good place to pick a successor.

About

Seed 1.6 Flash is an ultra-fast multimodal deep thinking model by ByteDance Seed, supporting both text and visual understanding.

Pricing

Input$0.10per 1M prompt tokens
Output$0.42per 1M generated tokens, reasoning included
Input over 128K$0.14the whole prompt is billed at this rate once it passes the threshold
Output over 128K$1.12applies to replies to those prompts

What a request costs

Typical requestEachPer 1,000
Short chat reply1,500 in · 400 out$0.0003$0.325
Question over a long document40,000 in · 800 out$0.0045$4.54
Agent tool step20,000 in · 1,200 out$0.0026$2.60
Very long prompt (over 128K)160,000 in · 1,500 out$0.024$24.08

At the developer-API rate, before any provider promotion or prompt-cache saving. In the app, the model picker shows what a message costs on your plan before you send it.

Call it from code

OpenAI-compatible: point any OpenAI SDK at https://api.privateer.pro/v1 and set model. Keys are created in the app under Settings.

cURL
curl https://api.privateer.pro/v1/chat/completions \
  -H "Authorization: Bearer $PRIVATEER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bytedance-seed/seed-1.6-flash",
    "messages": [{ "role": "user", "content": "Hello" }]
  }'
Python
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.privateer.pro/v1",
    api_key=os.environ["PRIVATEER_API_KEY"],
)
reply = client.chat.completions.create(
    model="bytedance-seed/seed-1.6-flash",
    messages=[{"role": "user", "content": "Hello"}],
)
print(reply.choices[0].message.content)
JavaScript
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.privateer.pro/v1",
  apiKey: process.env.PRIVATEER_API_KEY,
});
const reply = await client.chat.completions.create({
  model: "bytedance-seed/seed-1.6-flash",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(reply.choices[0].message.content);

Parameters this model accepts

frequency_penaltyinclude_reasoningmax_tokensreasoningresponse_formatstopstructured_outputstemperaturetool_choicetoolstop_p

API reference → · How API billing works →

Prices are USD at the developer-API rate, as of 16 Oct 2026, rebuilt daily from the providers’ live catalogues. ← All models