OpenAI: GPT-5-Nano · fastrouter

Name: OpenAI: GPT-5-Nano
Brand: OpenAI
Price: 0.05 USD
Availability: InStock

GPT‑5 Nano is optimized for ultra-fast performance and very low latency—ideal for real-time or embedded applications. Stripped down for speed, it excels at simple instruction-following and classification tasks, making it perfect for high-throughput API usage. With minimal overhead and rapid response times, GPT‑5 Nano is a great fit for lightweight environments or devices with limited compute capabilities. Yet, it preserves sufficient reasoning capability to remain practical across many practical scenarios.

Base model All models on this base All models of the provider to the provider

Input, $/1M $0.05

Output, $/1M $0.40

Cache read $0.005

Cache write —

Context 400 000

Max output 128 000

Accepts files, images, text

Last checked 04.11.2026 12:00:14 UTC

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API

OpenAI-compatible API: the official OpenAI SDKs work with this base URL. Replace YOUR_API_KEY with your key from the provider.

API base URL	`https://go.fastrouter.ai/api/v1`
Endpoint	`https://go.fastrouter.ai/api/v1/chat/completions`
Model id	`openai/gpt-5-nano`

curl

curl https://go.fastrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/gpt-5-nano", "messages": [{"role": "user", "content": "Hello!"}], "max_tokens": 256}'

Python

import requests

r = requests.post(
    "https://go.fastrouter.ai/api/v1/chat/completions",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
      "model": "openai/gpt-5-nano",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ],
      "max_tokens": 256
    },
)
print(r.json())

JavaScript

const r = await fetch("https://go.fastrouter.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
  body: JSON.stringify({
    "model": "openai/gpt-5-nano",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ],
    "max_tokens": 256
  }),
});
console.log(await r.json());

Request (JSON)

{
  "model": "openai/gpt-5-nano",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "max_tokens": 256
}

Response (JSON)

{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "model": "openai/gpt-5-nano",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hi! How can I help?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 12,
    "total_tokens": 21
  }
}

The address is taken from the provider's model list; check it against the provider's documentation.

Provider's API documentation

Source: AI Rate Card, https://airatecard.com/en/c/offer%3Afastrouter%7Copenai/gpt-5-nano, prices checked 2026-11-04; seller's page: https://fastrouter.ai/models/openai/gpt-5-nano

Technical details

ID: offer:fastrouter|openai/gpt-5-nano