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GPT-5.4 Nano API: toman pricing and code

openai/gpt-5.4-nano

Image inputTool callingReasoningJSON outputFile input
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Input · per 1M tokens
69,244 toman
Output · per 1M tokens
432,774 toman
One 1,000-word request ≈
653 toman

You are billed for the usage the request actually reported. Prices follow the market. Cached input: 6,924 toman per 1M tokens. Web search: 3,462.19 toman per request.Pricing and top-ups

GPT-5.4 Nano 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": "openai/gpt-5.4-nano",
    "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="openai/gpt-5.4-nano",
    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: "openai/gpt-5.4-nano",
  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 GPT-5.4 Nano good for?

The id for GPT-5.4 Nano in our API is "openai/gpt-5.4-nano", served from OpenAI. Context is 400,000 tokens; past that you have to summarise the history yourself. A single response can run to 128,000 tokens. On price it sits in the "cheap" band — cheaper than 227 and dearer than 167 of the other paid models in the catalogue.

What it can do beyond plain text: it reads images directly, which makes it a real option for invoices, forms and screenshots; it takes files such as PDFs as input; 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.

Pricing is 69,244 toman per 1M input tokens and 432,774 per 1M output tokens. A 1,000-word round trip on GPT-5.4 Nano lands near 653 toman. It supports cached input: repeated context is billed at 6,924 toman per 1M, which matters a lot if your system prompt is long. 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 Gemini 3.5 Flash Lite (batch), and GPT-5.4 Nano costs about the same, 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 153 thousand-word requests on GPT-5.4 Nano, and every 1,000 toman is about 1,531 words of round trip. A job with one million input tokens and one million output tokens comes to 502,018 toman in total. Filling this model's 400,000-token window costs 27,698 toman on the input side alone, which is the real reason to keep conversation history short.

Its nearest relative in the catalogue is "openai/gpt-5-mini", and choosing between those two is where most people hesitate. On a thousand-word request this variant works out about 38% cheaper (653 against 1,013 toman).

OpenAI has 81 models in our catalogue; the cheapest is gpt-oss-120b at 24 toman per thousand words and the dearest GPT-5.5 Pro at 94,518. Among the less common parameters it accepts max_completion_tokens, reasoning_effort, verbosity — all through the standard request body. It does not support temperature, top_p, 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 Llama 4 Scout at 327,680 tokens.

Good fits: 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

GPT-5.4 nano is the most lightweight and cost-efficient variant of the GPT-5.4 family, optimized for speed-critical and high-volume tasks. It supports text and image inputs and is designed for low-latency...

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 out277 toman
Summarising a ten-page document4,000 in + 600 out537 toman
Classifying a thousand short rows120,000 in + 20,000 out16,965 toman

Frequently asked

How do I call GPT-5.4 Nano 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 "openai/gpt-5.4-nano". Nothing else in your code changes.
What does GPT-5.4 Nano cost in toman?
69,244 toman per 1M input tokens and 432,774 toman per 1M output tokens; a 1,000-word request is around 653 toman. You pay for the usage that request actually reported, and a failed request costs nothing.
How much input does GPT-5.4 Nano take?
Up to 400,000 tokens per request, roughly 300k words. A single answer can reach 128,000 tokens.
Does GPT-5.4 Nano 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.