OpenAI API – Access GPT Models (Chat, Completion, Embeddings)

The OpenAI API provides access to powerful AI models like GPT-4 and GPT-3.5 for tasks such as natural language processing, code generation, summarization, chatbots, and more.



🔗 Base URL

https://api.openai.com/v1/



Authentication

You’ll need an API key from your OpenAI account.
Get your API key here

Add the key to the Authorization header:

Authorization: Bearer YOUR_API_KEY



1. Chat Completions (GPT-4, GPT-3.5)

Endpoint:

POST /chat/completions

Example Request:

{
  "model": "gpt-4",
  "messages": [
    { "role": "user", "content": "Tell me a joke about AI." }
  ]
}

cURL:

curl https://api.openai.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4",
    "messages": [{"role": "user", "content": "Tell me a joke about AI."}]
  }'



2. Text Completions

Endpoint:

POST /completions

Example Request:

{
  "model": "text-davinci-003",
  "prompt": "Write a haiku about the moon.",
  "max_tokens": 50
}



3. Embeddings

Endpoint:

POST /embeddings

Example Request:

{
  "model": "text-embedding-ada-002",
  "input": "AI is transforming the world."
}



Pricing (As of 2024)

Model Price per 1K tokens (Input) Price per 1K tokens (Output)
GPT-4 (8K context) $0.03 $0.06
GPT-3.5 (Turbo) $0.0015 $0.002
Embeddings (Ada-002) $0.0001 N/A

View full pricing



Libraries & SDKs

  • Node.js: openai
  • Python: openai
  • Others: Community SDKs for Go, Ruby, Java, etc.

OpenAI API Reference



⚠️ Rate Limits

Rate limits depend on the model and plan. For example:

  • Free trial accounts: limited quota
  • Paid plans: higher throughput

Check usage dashboard