GPT-4.1 nano

Text Generation • OpenAI

openai/gpt-4.1-nano

• Third-party
• Zero data retention

GPT-4.1 Nano is OpenAI’s smallest and cheapest GPT-4.1 variant, optimized for high-throughput, low-latency tasks.

Usage

const response = await env.AI.run(
  'openai/gpt-4.1-nano',
  { messages: [{ content: 'What are the three laws of thermodynamics?', role: 'user' }] },
)
console.log(response)

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "openai/gpt-4.1-nano",
  "messages": [
    {
      "content": "What are the three laws of thermodynamics?",
      "role": "user"
    }
  ]
}'

The three laws of thermodynamics are fundamental principles that describe the behavior of energy and temperature in physical systems:

1. **First Law of Thermodynamics (Law of Energy Conservation):**  
   Energy cannot be created or destroyed in an isolated system. The total energy remains constant, implying that the change in the internal energy of a system is equal to the heat added to the system minus the work done by the system.  
   Mathematically:  
   \[
   \Delta U = Q - W
   \]

2. **Second Law of Thermodynamics:**  
   The entropy of an isolated system always tends to increase over time, and natural processes tend to move towards a state of maximum entropy. This law introduces the concept of irreversibility and asserts that heat cannot spontaneously flow from a colder to a hotter body without external work.

3. **Third Law of Thermodynamics:**  
   As the temperature of a perfect crystal approaches absolute zero (0 Kelvin), the entropy of the system approaches a constant minimum, often taken as zero. This implies that absolute zero temperature is unattainable in a finite number of steps.

These laws form the foundation of thermodynamics and are essential in understanding energy systems, engines, refrigerators, and many other physical phenomena.

{
  "choices": [
    {
      "finish_reason": "stop",
      "index": 0,
      "logprobs": null,
      "message": {
        "annotations": [],
        "content": "The three laws of thermodynamics are fundamental principles that describe the behavior of energy and temperature in physical systems:\n\n1. **First Law of Thermodynamics (Law of Energy Conservation):**  \n   Energy cannot be created or destroyed in an isolated system. The total energy remains constant, implying that the change in the internal energy of a system is equal to the heat added to the system minus the work done by the system.  \n   Mathematically:  \n   \\[\n   \\Delta U = Q - W\n   \\]\n\n2. **Second Law of Thermodynamics:**  \n   The entropy of an isolated system always tends to increase over time, and natural processes tend to move towards a state of maximum entropy. This law introduces the concept of irreversibility and asserts that heat cannot spontaneously flow from a colder to a hotter body without external work.\n\n3. **Third Law of Thermodynamics:**  \n   As the temperature of a perfect crystal approaches absolute zero (0 Kelvin), the entropy of the system approaches a constant minimum, often taken as zero. This implies that absolute zero temperature is unattainable in a finite number of steps.\n\nThese laws form the foundation of thermodynamics and are essential in understanding energy systems, engines, refrigerators, and many other physical phenomena.",
        "refusal": null,
        "role": "assistant"
      }
    }
  ],
  "created": 1777320190,
  "gatewayMetadata": {
    "keySource": "Unified"
  },
  "id": "chatcmpl-DZMScK7GU5VKq3YMOIJvLRfotOhnW",
  "model": "gpt-4.1-nano-2025-04-14",
  "object": "chat.completion",
  "service_tier": "default",
  "system_fingerprint": "fp_8fc5e9a3e3",
  "usage": {
    "completion_tokens": 252,
    "completion_tokens_details": {
      "accepted_prediction_tokens": 0,
      "audio_tokens": 0,
      "reasoning_tokens": 0,
      "rejected_prediction_tokens": 0
    },
    "prompt_tokens": 16,
    "prompt_tokens_details": {
      "audio_tokens": 0,
      "cached_tokens": 0
    },
    "total_tokens": 268
  }
}

Examples

<details>

<summary>With System Message — Using a system message to set context</summary>

const response = await env.AI.run(
  'openai/gpt-4.1-nano',
  {
    messages: [
      { content: 'You are a helpful coding assistant specializing in Python.', role: 'system' },
      { content: 'How do I read a JSON file in Python?', role: 'user' },
    ],
  },
)
console.log(response)

curl https://api.cloudflare.com/client/v4/accounts/$CLOUDFLARE_ACCOUNT_ID/ai/v1/chat/completions \
  --header "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "openai/gpt-4.1-nano",
  "messages": [
    {
      "content": "You are a helpful coding assistant specializing in Python.",
      "role": "system"
    },
    {
      "content": "How do I read a JSON file in Python?",
      "role": "user"
    }
  ]
}'

``` To read a JSON file in Python, you can use the built-injson` module which provides functions for parsing JSON data. Here's a simple step-by-step example:

1. Import the json module.
2. Open the JSON file using open().
3. Use json.load() to parse the data from the file into a Python data structure (usually a dictionary or list).

Here's an example:

```python import json