OpenAI: GPT-5.4: AI model
GPT-5.4 is an OpenAI model. A frontier model that unifies the Codex and GPT lines with a 1M-token context, with up to 1.1M-token context. Reachable from inside Iran through Hormouz.
- Context window:
- 1,050,000 tokens
- Input:
- $2.5/1M tokens
- Output:
- $15/1M tokens
- Type:
- text, image
- Vision
- Tools
- Streaming
- Long context
Thinking levels: xhigh · high · medium · low · none
GPT-5.4 is a frontier model that unifies the Codex and GPT lines with a 1M-token context. GPT-5.4 unifies OpenAI's Codex and GPT lines into one system with a 1M+-token window (922K input, 128K output) and text-plus-image input. It improves coding, document understanding, tool use and instruction following, and is positioned as a strong default for both general tasks and software engineering. It supports a context window of up to 1.1M tokens.
GPT-5.4 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: $2.5 per million input tokens and $15 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 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for...
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",
"messages": [{"role": "user", "content": "Hello!"}]
}'Specs
| Vendor | OpenAI |
|---|---|
| Type | Text, Image |
| Context window | 1,050,000 tokens |
| Pricing | $2.50/M in · $15.00/M out |
| API | Chat Completions |
| Capabilities | Streaming · Vision · Tools |
Benchmarks
Reasoning
Coding
Agentic
Source: Artificial Analysis
Design Arena
How Design Arena works ↗Ranking distribution
5721 tournaments ?
Metrics sourced from Design Arena
Code example
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",
"messages": [{"role": "user", "content": "Hello!"}]
}'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",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)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",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);Buy the OpenAI: GPT-5.4 API, paid in rial
- Buy credit with an Iranian bank card; no foreign card or account needed.
- One Hormouz key reaches OpenAI: GPT-5.4 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.
Use via Hormouz
Connect to this model and 600+ others with one API key, then see usage down to each request.
Request company accessFAQ
- How much does GPT-5.4 cost?
- Billing is usage-based: $2.5 per million input tokens and $15 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 from inside Iran?
- Create an account on Hormouz and generate an API key. Hormouz provides a stable path to GPT-5.4 from inside Iran, with no foreign credit card or circumvention tooling required.
- Is GPT-5.4 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 have?
- GPT-5.4 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 high-context reasoning, agentic coding, multi-source synthesis, document analysis and complex multi-step workflows.
- What is GPT-5.4 good for?
- GPT-5.4 works well for high-context reasoning, agentic coding, multi-source synthesis, document analysis and complex multi-step workflows.
- Does GPT-5.4 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