Name: GPT-4.1 – 1M Token Context Window | Free · $1/mo | API.market
Brand: swift-api
SKU: api-swift-api-gpt-4-1
Availability: InStock
Author: API Market

Swift API

# GPT-4.1

## Overview

The GPT-4.1 API provides access to a powerful AI model excelling at instruction following, tool calling, and broad knowledge across various domains. This API features a large context window of 1 million tokens, enabling processing of extensive text sequences, and offers low-latency responses without a separate reasoning step. It's ideal for complex tasks requiring deep understanding and nuanced text generation.

## Features

* **Instruction Following:**  Excels at understanding and executing instructions, making it suitable for tasks requiring specific actions based on provided guidelines.
* **Tool Calling:**  Can interact with external tools and APIs, expanding its capabilities beyond text processing. (Note: Tool calling is not currently implemented in this API version).
* **Broad Knowledge:** Possesses extensive knowledge across numerous domains, allowing for informed and contextually relevant responses.
* **1M Token Context Window:**  Handles vast amounts of text, enabling comprehensive analysis and generation of long-form content.
* **Low Latency:**  Provides quick responses without a dedicated reasoning step, ensuring a smooth and efficient user experience.
* **Content Filtering:** Built-in content filters for hate, self-harm, sexual, and violent content.

## Use Cases

* **Advanced Chatbots:** Build highly intelligent and interactive chatbots capable of handling complex conversations and providing informative responses.  This is especially relevant for customer service, technical support, and educational applications.
* **Content Creation:** Generate diverse forms of content, from articles and blog posts to creative writing and code.  Target industries like marketing, journalism, and software development with this capability.
* **Code Generation and Understanding:** Write, debug, and explain code in various programming languages, boosting productivity for software engineers.
* **Long-Form Text Analysis:** Analyze extensive documents, research papers, and legal texts, extracting key insights and summarizing complex information. This is beneficial for researchers, legal professionals, and analysts.
* **Automated Report Generation:** Create comprehensive and insightful reports based on data analysis and interpretation, streamlining reporting processes in finance, healthcare, and other data-driven industries.


## API Documentation

### Base URL

`https://prod.api.market/api/v1/magicapi/gpt-4-1`

### Authentication

Include your API key in the `x-api-market-key` header:

```
x-api-market-key: YOUR_API_MARKET_KEY
```


### Endpoints

#### Create Chat Completion

```
POST /api/v1/magicapi/gpt-4-1/chat/completions
```

Creates a model response for a given chat conversation.

**Request Body (application/json):**

```json
{
  "model": "GPT-4.1",
  "stream": false,
  "messages": [
    { "role": "user", "content": "There are ten birds in a tree. A hunter shoots one. How many are left in the tree?" }
  ]
}
```

**cURL Example:**

```bash
curl -X POST "https://prod.api.market/api/v1/magicapi/gpt-4-1/chat/completions" \
-H "Content-Type: application/json" \
-H "x-api-market-key: YOUR_API_MARKET_KEY" \
-d '{
  "model": "GPT-4.1",
  "stream": false,
  "messages": [
    { "role": "user", "content": "There are ten birds in a tree. A hunter shoots one. How many are left in the tree?" }
  ]
}'
```


**Response (application/json - Successful):**

```json
{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "created": 1757766003,
  "model": "gpt-4.1",
  "choices": [
    {
      "index": 0,
      "finish_reason": "stop",
      "message": {
        "role": "assistant",
        "content": "If a hunter shoots one bird, the noise would likely scare the other birds away. So, even though one bird is shot, the rest would typically fly off, leaving **0 birds** in the tree."
      }
    }
  ],
  "usage": {
    "prompt_tokens": 28,
    "completion_tokens": 43,
    "total_tokens": 71
  }
}
```

## Status Codes

*   **200 OK:** Request successful.
*   **201 Created:** Resource successfully created.
*   **400 Bad Request:** Invalid input parameters or malformed request.
*   **401 Unauthorized:** Missing or invalid API key.
*   **403 Forbidden:** Valid API key but insufficient permissions.
*   **404 Not Found:** Resource not found.
*   **429 Too Many Requests:** Rate limit exceeded.
*   **500 Internal Server Error:** Server-side error.
*   **503 Service Unavailable:** Service temporarily unavailable.


## Error Handling

Errors are returned in JSON format:

```json
{
  "error": {
    "code": "invalid_parameter",
    "message": "The parameter 'messages' is required",
    "status": 400
  }
}
```

Common errors include invalid input parameters, authentication failures, and rate limit issues.  Retry requests with exponential backoff for transient errors (500s).


## Implementation Guide

### Example Code


See code examples provided earlier in Python and Javascript for proper asynchronous handling with polling and timeouts.



### Performance Optimization

For optimal performance:
*   Optimize prompt design for conciseness and clarity.
*   Implement efficient retry mechanisms.


## FAQ

*   **Q: What is the maximum context window size?**
    *   A: 1 million tokens.

*   **Q: What languages are supported for code generation?**
    *   A:  Many popular languages; please refer to the model documentation for a complete list.


## Contact Us

If you have any questions or need assistance, you can reach out to us through the embedded chat on the bottom right corner of the page or send an email contact@swiftapi.net



AI model with a 1M token context window for complex tasks and instruction following. Free 1000 calls/mo, from $1/mo. Start free on API.market.

GPT-4.1 – 1M Token Context Window | Free · $1/mo | API.market

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GPT-4.1 excels at instruction following and tool calling, with broad knowledge across domains. It features a 1M token context window, and low latency without a 

GPT-4.1