How much does GPT-5.4 Pro cost?

Billing is usage-based: $30 per million input tokens and $180 per million output tokens. There is no fixed monthly fee. You pay only for what you use, and current rates are shown in the Hormouz dashboard.

How do I access GPT-5.4 Pro from inside Iran?

Create an account on Hormouz and generate an API key. Hormouz provides a stable path to GPT-5.4 Pro from inside Iran, with no foreign credit card or circumvention tooling required.

Is GPT-5.4 Pro compatible with OpenAI code?

Yes. Hormouz exposes an OpenAI-compatible API. Just change the base URL to Hormouz and swap in your Hormouz key. Your existing SDKs and chat-completions code run without a rewrite.

What context window and capabilities does GPT-5.4 Pro have?

GPT-5.4 Pro supports a context window of up to 1.1M tokens. It also supports tool calling, image (vision) input and step-by-step reasoning. That makes it a good fit for agentic coding, long-context workflows and multi-step problem solving where maximum accuracy justifies a premium tier.

What is GPT-5.4 Pro good for?

GPT-5.4 Pro works well for agentic coding, long-context workflows and multi-step problem solving where maximum accuracy justifies a premium tier.

Does GPT-5.4 Pro support streaming?

Yes. Responses can be streamed token by token over the OpenAI-compatible API, which is ideal for chat UIs and low-latency apps. You call it the same way as any other chat model on Hormouz.

OpenAI: GPT-5.4 Pro: AI model

GPT-5.4 Pro is an OpenAI model. The most advanced GPT-5.4 tier for complex, high-stakes reasoning, with up to 1.1M-token context. Reachable from inside Iran through Hormouz.

Context window:: 1,050,000 tokens
Input:: $30/1M tokens
Output:: $180/1M tokens
Type:: text, image

Vision
Tools
Streaming
Long context

Thinking levels: Always thinks · xhigh · high · medium

GPT-5.4 Pro is the most advanced GPT-5.4 tier for complex, high-stakes reasoning. GPT-5.4 Pro builds on GPT-5.4's unified architecture with enhanced reasoning for demanding tasks. It offers a 1M+-token window (922K input, 128K output) with text and image input and is optimized for step-by-step reasoning, instruction following and accuracy. It supports a context window of up to 1.1M tokens.

GPT-5.4 Pro is served through Hormouz behind an OpenAI-compatible API. It supports tool calling, image (vision) input and step-by-step reasoning. Point your base URL at Hormouz and drop in a Hormouz key, and existing OpenAI SDK code runs unchanged.

Pricing is usage-based: $30 per million input tokens and $180 per million output tokens. Hormouz provides stable access to the model from inside Iran, with no foreign credit card or circumvention tooling required.

GPT-5.4 Pro is OpenAI's most advanced model, building on GPT-5.4's unified architecture with enhanced reasoning capabilities for complex, high-stakes tasks. It features a 1M+ token context window (922K input, 128K...

Quickstart

curl https://api.hormouz.net/v1/chat/completions \
  -H "Authorization: Bearer ng-YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4-pro",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Specs

Vendor	OpenAI
Type	Text, Image
Context window	1,050,000 tokens
Pricing	$30.00/M in · $180.00/M out
API	Chat Completions
Capabilities	Streaming · Vision · Tools

Benchmarks

Reasoning

CritPt

Research-level physics reasoning

30%

Source: Artificial Analysis

Code example

cURL

curl https://api.hormouz.net/v1/chat/completions \
  -H "Authorization: Bearer ng-YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4-pro",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Python

from openai import OpenAI
client = OpenAI(api_key="ng-YOUR_API_KEY", base_url="https://api.hormouz.net/v1")
response = client.chat.completions.create(
    model="openai/gpt-5.4-pro",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ apiKey: "ng-YOUR_API_KEY", baseURL: "https://api.hormouz.net/v1" });
const response = await client.chat.completions.create({
  model: "openai/gpt-5.4-pro",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

Buy the OpenAI: GPT-5.4 Pro API, paid in rial

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One Hormouz key reaches OpenAI: GPT-5.4 Pro and 600+ other models, and you pay only for what you use.
No VPN and no risk of a banned account; just change the base URL to api.hormouz.net/v1.

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FAQ

How much does GPT-5.4 Pro cost?: Billing is usage-based: $30 per million input tokens and $180 per million output tokens. There is no fixed monthly fee. You pay only for what you use, and current rates are shown in the Hormouz dashboard.
How do I access GPT-5.4 Pro from inside Iran?: Create an account on Hormouz and generate an API key. Hormouz provides a stable path to GPT-5.4 Pro from inside Iran, with no foreign credit card or circumvention tooling required.
Is GPT-5.4 Pro compatible with OpenAI code?: Yes. Hormouz exposes an OpenAI-compatible API. Just change the base URL to Hormouz and swap in your Hormouz key. Your existing SDKs and chat-completions code run without a rewrite.
What context window and capabilities does GPT-5.4 Pro have?: GPT-5.4 Pro supports a context window of up to 1.1M tokens. It also supports tool calling, image (vision) input and step-by-step reasoning. That makes it a good fit for agentic coding, long-context workflows and multi-step problem solving where maximum accuracy justifies a premium tier.
What is GPT-5.4 Pro good for?: GPT-5.4 Pro works well for agentic coding, long-context workflows and multi-step problem solving where maximum accuracy justifies a premium tier.
Does GPT-5.4 Pro support streaming?: Yes. Responses can be streamed token by token over the OpenAI-compatible API, which is ideal for chat UIs and low-latency apps. You call it the same way as any other chat model on Hormouz.

Updated 2026-10-13