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Seed 1.6 Flash API: toman pricing and code

bytedance-seed/seed-1.6-flash

Image inputTool callingReasoningJSON output
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Input · per 1M tokens
25,966 toman
Output · per 1M tokens
103,866 toman
One 1,000-word request ≈
169 toman

You are billed for the usage the request actually reported. Prices follow the market.Pricing and top-ups

Seed 1.6 Flash example: reading an image into JSON

The example is picked from this model's own capabilities. Drop in your key and it runs as is.

# tip: a data URI works too — base64 the file and prefix it with data:image/jpeg;base64,
curl https://api.uttapen.ir/v1/chat/completions \
  -H "Authorization: Bearer sk-up-…" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "bytedance-seed/seed-1.6-flash",
    "messages": [{
      "role": "user",
      "content": [
        {"type": "text", "text": "Return only the invoice number and the total, as JSON."},
        {"type": "image_url", "image_url": {"url": "https://example.com/factor.jpg"}}
      ]
    }]
  }'
import base64, json
from openai import OpenAI

client = OpenAI(base_url="https://api.uttapen.ir/v1", api_key="sk-up-…")

img = base64.b64encode(open("factor.jpg", "rb").read()).decode()

resp = client.chat.completions.create(
    model="bytedance-seed/seed-1.6-flash",
    messages=[{
        "role": "user",
        "content": [
            {"type": "text", "text": "Return the invoice number, the date and the total as JSON."},
            {"type": "image_url", "image_url": {"url": f"data:image/jpeg;base64,{img}"}},
        ],
    }],
    response_format={"type": "json_object"},
)
print(json.loads(resp.choices[0].message.content))
import OpenAI from "openai";
import { readFileSync } from "node:fs";

const client = new OpenAI({ baseURL: "https://api.uttapen.ir/v1", apiKey: "sk-up-…" });
const img = readFileSync("factor.jpg").toString("base64");

const resp = await client.chat.completions.create({
  model: "bytedance-seed/seed-1.6-flash",
  messages: [{
    role: "user",
    content: [
      { type: "text", text: "Return the invoice number, the date and the total as JSON." },
      { type: "image_url", image_url: { url: `data:image/jpeg;base64,${img}` } },
    ],
  }],
  response_format: { type: "json_object" },
});
console.log(JSON.parse(resp.choices[0].message.content));

What is Seed 1.6 Flash good for?

Seed 1.6 Flash is one of ByteDance Seed's models. Put "bytedance-seed/seed-1.6-flash" in the model field and the rest of your code stays as it is. Seed 1.6 Flash keeps 262,144 tokens in view at once, and that number is what caps the conversation history in your product. A single response can run to 32,768 tokens. On price it sits in the "very cheap" band — cheaper than 330 and dearer than 61 of the other paid models in the catalogue.

Capabilities available on this id: it reads images directly, which makes it a real option for invoices, forms and screenshots; it supports tool calling, so it can invoke your own functions with valid arguments; it returns schema-valid JSON through response_format, ready to hand to your code; it has a reasoning mode that pays off on multi-step problems, maths and debugging. All of it works through the standard parameters of the official OpenAI SDK — no custom client, no wrapper. Keep in mind that reasoning tokens are output tokens and do appear on the bill.

For a back-of-envelope figure: about 169 toman per 1,000-word exchange (25,966 in, 103,866 out, per 1M tokens). You are always charged for the usage the request actually reported, never for the estimate, and a failed request costs nothing.

The closest alternative with the same capabilities from a different provider is Llama 4 Scout: Seed 1.6 Flash works out about 9% cheaper, and its context window is smaller. Both run on the same key and the same code, so trying the other one is a single string change.

To make the figure concrete: 100,000 toman of credit buys roughly 592 thousand-word requests on Seed 1.6 Flash, and every 1,000 toman is about 5,917 words of round trip. A job with one million input tokens and one million output tokens comes to 129,832 toman in total. Filling this model's 262,144-token window costs 6,807 toman on the input side alone, which is the real reason to keep conversation history short.

Its nearest relative in the catalogue is "bytedance-seed/seed-2.0-mini", and choosing between those two is where most people hesitate. On a thousand-word request this variant works out about 23% cheaper (169 against 225 toman). Maximum answer length differs as well: 32,768 against 131,072 tokens. On parameters the other takes reasoning_effort.

ByteDance Seed has 6 models in our catalogue; the cheapest is Seed 1.6 Flash at 169 toman per thousand words and the dearest Seed-2.0-Code at 1,575. It does not support seed, which most models here do, so test before switching if your code relies on them. By context size the nearest option from another provider is Aion 3.5 at 262,144 tokens.

What to use it for: high-volume work such as classification, tagging and bulk summarising, logic puzzles and code review, pulling text and fields out of images, agents that reach out to APIs and databases, extracting data against a fixed schema, analysing a long document or codebase in one request.

Provider's own description

Seed 1.6 Flash is an ultra-fast multimodal deep thinking model by ByteDance Seed, supporting both text and visual understanding. It features a 256k context window and can generate outputs of...

Three real jobs, priced on this model

Each figure is derived from the prices above and moves when they do.

JobTokensCost
One chat turn with a medium history1,500 in + 400 out80 toman
Summarising a ten-page document4,000 in + 600 out166 toman
Classifying a thousand short rows120,000 in + 20,000 out5,193 toman

Frequently asked

How do I call Seed 1.6 Flash from Iran?
Sign up with your mobile number, top the wallet up in toman, create an API key, then in the official OpenAI SDK point base_url at https://api.uttapen.ir/v1 and set model to "bytedance-seed/seed-1.6-flash". Nothing else in your code changes.
What does Seed 1.6 Flash cost in toman?
25,966 toman per 1M input tokens and 103,866 toman per 1M output tokens; a 1,000-word request is around 169 toman. You pay for the usage that request actually reported, and a failed request costs nothing.
How much input does Seed 1.6 Flash take?
Up to 262,144 tokens per request, roughly 197k words. A single answer can reach 32,768 tokens.
Does Seed 1.6 Flash support streaming and tool calling?
Streaming (stream=true) works on every model here. This one supports tool calling in the standard OpenAI shape. Image input is accepted through image_url, as a data URI or a public URL. Structured output through response_format works too.