How much does GPT-5.1 Codex Max cost?

Billing is usage-based: $1.25 per million input tokens and $10 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-5.1 Codex Max from inside Iran?

Create an account on Hormouz and generate an API key. Hormouz provides a stable path to GPT-5.1 Codex Max from inside Iran, with no foreign credit card or circumvention tooling required.

Is GPT-5.1 Codex Max 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 is GPT-5.1 Codex Max good for?

GPT-5.1 Codex Max is purpose-built for coding and software engineering. Writing and refactoring code, agentic development runs, debugging and working across large codebases.

What is GPT-5.1 Codex Max's knowledge cutoff?

GPT-5.1 Codex Max's training data runs through Sep 2024. For information newer than that, provide the relevant context in your prompt or connect a tool that fetches live data.

OpenAI: GPT-5.1-Codex-Max: AI model

GPT-5.1 Codex Max is an OpenAI model. An agentic coding model built for long-running, high-context software development, with up to 400K-token context. Reachable from inside Iran through Hormouz.

Context window:: 400,000 tokens
Input:: $1.25/1M tokens
Output:: $10/1M tokens
Type:: text, image

Vision
Tools
Streaming
Long context

Thinking levels: Always thinks · xhigh · high · medium · low

GPT-5.1 Codex Max is an agentic coding model built for long-running, high-context software development. GPT-5.1 Codex Max is built on an updated 5.1 reasoning stack and trained on agentic tasks for long-horizon, high-context development. It supports a context window of up to 400K tokens, with training data through Sep 2024.

GPT-5.1 Codex Max 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: $1.25 per million input tokens and $10 per million output tokens. Hormouz provides stable access to the model from inside Iran, with no foreign credit card or circumvention tooling required.

GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...

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-5.1-codex-max",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Specs

Vendor	OpenAI
Type	Text, Image
Context window	400,000 tokens
Pricing	$1.25/M in · $10.00/M out
API	Chat Completions
Capabilities	Streaming · Vision · Tools

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-5.1-codex-max",
    "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-5.1-codex-max",
    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-5.1-codex-max",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

Buy the OpenAI: GPT-5.1-Codex-Max API, paid in rial

Buy credit with an Iranian bank card; no foreign card or account needed.
One Hormouz key reaches OpenAI: GPT-5.1-Codex-Max 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.

Create an account Buy ChatGPT (OpenAI) API access, paid in rial

Use via Hormouz

Connect to this model and 600+ others with one API key, then see usage down to each request.

Request company access

FAQ

How much does GPT-5.1 Codex Max cost?: Billing is usage-based: $1.25 per million input tokens and $10 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-5.1 Codex Max from inside Iran?: Create an account on Hormouz and generate an API key. Hormouz provides a stable path to GPT-5.1 Codex Max from inside Iran, with no foreign credit card or circumvention tooling required.
Is GPT-5.1 Codex Max 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-5.1 Codex Max have?: GPT-5.1 Codex Max supports a context window of up to 400K tokens. It also supports tool calling, image (vision) input and step-by-step reasoning. That makes it a good fit for long documents, codebases and multi-turn conversations.
What is GPT-5.1 Codex Max good for?: GPT-5.1 Codex Max is purpose-built for coding and software engineering. Writing and refactoring code, agentic development runs, debugging and working across large codebases.
What is GPT-5.1 Codex Max's knowledge cutoff?: GPT-5.1 Codex Max's training data runs through Sep 2024. For information newer than that, provide the relevant context in your prompt or connect a tool that fetches live data.

Updated 2026-10-13