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OpenAI: GPT-5 Nano: AI model

GPT-5 Nano is the smallest, fastest member of the GPT-5 family, optimized for developer tools, rapid interaction and ultra-low latency, with a 400K-token context window. Reachable from inside Iran through Hormouz.

Context window:
400,000 tokens
Input:
$0.05/1M tokens
Output:
$0.4/1M tokens
Type:
text, image
  • Vision
  • Tools
  • Streaming
  • Long context
Good for:Popular for Health · #6Popular for Marketing & SEO · #13Ranks are based on global usage data

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

GPT-5 Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interaction and ultra-low-latency environments. It accepts text, image and file input, produces text output, and supports reasoning and tool calling.

While more limited in reasoning depth than its larger siblings, it retains key instruction-following and safety features and is a lightweight option for cost-sensitive or real-time applications. Its 400K-token context window suits large contexts. Hormouz exposes an OpenAI-compatible API. Point your base URL at Hormouz, drop in a Hormouz key, and existing OpenAI SDK code runs unchanged.

Pricing is usage-based: $0.05/M in · $0.4/M out. Hormouz provides stable access to the model from inside Iran, with no foreign credit card or circumvention tooling required.

GPT-5-Nano is the smallest and fastest variant in the GPT-5 system, optimized for developer tools, rapid interactions, and ultra-low latency environments. While limited in reasoning depth compared to its larger...

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-nano",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Specs

VendorOpenAI
TypeText, Image
Context window400,000 tokens
Pricing$0.05/M in · $0.40/M out
APIChat Completions
CapabilitiesStreaming · Vision · Tools

Benchmarks

Reasoning

GPQA Diamond
Graduate-level scientific reasoning
67%
HLE
Humanity's Last Exam
8.7%
IFBench
Instruction-following
65.9%
AA-LCR
Long-context reasoning
43.7%
CritPt
Research-level physics reasoning
0%
AA Omniscience
Broad factual knowledge accuracy
17.6%
Non-Hallucination
Rate of avoiding fabricated answers
47.4%

Coding

Terminal-Bench Hard
Agentic coding & terminal use
17.4%

Agentic

τ²-Bench
Tool-use agents in dual-control scenarios
30.4%

Source: Artificial Analysis

Design Arena

How Design Arena works ↗
3D
Top 93%
976Elo
Win rate: 36.3%Avg time: 88.2s
Code
Top 78%
1,090Elo
Win rate: 48%Avg time: 90.8s
Data Viz
Top 83%
1,064Elo
Win rate: 46.2%Avg time: 80.7s
Game Dev
Top 80%
1,057Elo
Win rate: 46.5%Avg time: 98.0s
UI Component
Top 79%
1,073Elo
Win rate: 51.9%Avg time: 85.9s
Website
Top 74%
1,108Elo
Win rate: 48.9%Avg time: 90.8s

Metrics sourced from Design Arena

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

Buy the OpenAI: GPT-5 Nano API, paid in rial

  • Buy credit with an Iranian bank card; no foreign card or account needed.
  • One Hormouz key reaches OpenAI: GPT-5 Nano 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 Nano cost?
Billing is usage-based: $0.05/M in · $0.4/M out. There is no fixed monthly fee. You pay only for what you use.
How do I use GPT-5 Nano from inside Iran?
Create a Hormouz account and generate an API key. Hormouz gives you a stable route to the model from inside Iran, with no foreign credit card or circumvention tooling needed.
Is GPT-5 Nano OpenAI-compatible?
Yes. Hormouz serves an OpenAI-compatible API. Point your base URL at Hormouz and swap in a Hormouz key; your existing SDKs and code work without a rewrite.
What is GPT-5 Nano good for?
Developer tools, rapid interaction and real-time or cost-sensitive applications that need ultra-low latency.
How does GPT-5 Nano differ from the larger family members?
It is faster and cheaper but has less reasoning depth; if you need top-tier reasoning quality, the larger variants are a better fit.
How large is GPT-5 Nano's context window?
The context window is up to 400K tokens, and the model supports tool calling.

Updated 2026-10-13