Is ChatGPT API — GPT-4, o1 and o3 integration free?

ChatGPT API — GPT-4, o1 and o3 integration has a Basic plan that costs $0 per month and needs no card. Paid plans exist for higher volume and are listed above.

How do I get an API key for ChatGPT API — GPT-4, o1 and o3 integration?

Subscribe to the free plan on the marketplace listing. The key appears immediately and works in the browser playground before you write any code.

How many endpoints does ChatGPT API — GPT-4, o1 and o3 integration have?

ChatGPT API — GPT-4, o1 and o3 integration publishes 1 endpoints. Each one is listed above with its method, path and purpose.

ChatGPT API — GPT-4, o1 and o3 integration

A single REST interface onto OpenAI models for chat and automation.

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Category: Artificial intelligence
Endpoints: 1
Updated: 2025-11-26

Overview

One endpoint onto the OpenAI model family, including GPT-4 and the reasoning models, for chatbots, support automation and workflow tools.

It removes the SDK and key-management step for products that only need the call.

Endpoints

Endpoints published by ChatGPT API — GPT-4, o1 and o3 integration, with method, path and purpose
Method	Path	What it does
POST	`{\n \`	Generate Sentiment Analysis

Example response

{
    "result": {
        "response": {
            "overallSentiment": "positive",
            "sentimentScore": 0.8,
            "aspects": [
                {
                    "aspect": "product quality",
                    "sentiment": "positive",
                    "score": 0.9
                },
                {
                    "aspect": "price",
                    "sentiment": "negative",
                    "score": -0.3
                },
                {
                    "aspect": "overall satisfaction",
                    "sentiment": "positive",
                    "score": 0.8
                }
            ],
            "keyPhrases": [
                "exceeded my expectations",
                "quality is outstanding",
                "price is a bit high",
                "very satisfied with my purchase"
            ],
            "confidence": 0.95
        },
        "model": "gpt-4o-mini",
        "prompt": "Please respond in en language.\n\nAnalyze the sentiment of this customer review: 'The product exceeded my expectations. The quality is outstanding, though the price is a bit high. Overall, I'm very satisfied with my purchase.'",
        "responseType": {
            "format": "json",
            "structure": {
                "overallSentiment": "string (positive/negative/neutral)",
                "sentimentScore": "number (-1 to 1)",
                "aspects": [
                    {
                        "aspect": "string",
                        "sentiment": "string",
                        "score": "number"
                    }
                ],
                "keyPhrases": [
                    "array of strings"
                ],
                "confidence": "number (0-1)"
            }
        }
    },
    "cacheTi
…

Frequently asked questions

Is ChatGPT API — GPT-4, o1 and o3 integration free?: ChatGPT API — GPT-4, o1 and o3 integration has a Basic plan that costs $0 per month and needs no card. Paid plans exist for higher volume and are listed above.
How do I get an API key for ChatGPT API — GPT-4, o1 and o3 integration?: Subscribe to the free plan on the marketplace listing. The key appears immediately and works in the browser playground before you write any code.
How many endpoints does ChatGPT API — GPT-4, o1 and o3 integration have?: ChatGPT API — GPT-4, o1 and o3 integration publishes 1 endpoints. Each one is listed above with its method, path and purpose.