How to Get OpenAI API Key for Free: 3 Methods (2026)

The OpenAI API powers applications using GPT-4o, DALL-E 4, Whisper, and more. While production usage requires a paid account, there are legitimate ways to get free API access for experimentation, learning, and prototyping.

This guide covers three working methods to get free OpenAI API access in 2026, complete with step-by-step instructions, code examples, and honest notes on the limitations.

Quick Comparison

Method	Free Credit	Models Available	Duration	Credit Card Required
OpenAI Free Tier	$5	GPT-4o-mini, GPT-3.5 Turbo, DALL-E 3	3 months	No
Azure for Students	$100	GPT-4o, GPT-4 Turbo, DALL-E 3	12 months	No
Free Alternative APIs	Varies	Gemini, Mistral, Llama, DeepSeek	Ongoing	No

Method 1: OpenAI Free Tier Credits ($5)

OpenAI gives $5 in free credits to new accounts. This is the most straightforward method.

Step-by-Step Setup

Go to platform.openai.com
Click Sign up and create an account with your email, Google, or Microsoft account
Verify your email address
Complete phone number verification (required)
Navigate to Settings > Billing to confirm your free credits
Go to API Keys > Create new secret key
Name your key and copy it immediately (you cannot view it again)

What $5 Gets You

Model	Price per 1M Input Tokens	Price per 1M Output Tokens	Approximate Free Usage
GPT-4o-mini	$0.15	$0.60	~7,000 queries
GPT-3.5 Turbo	$0.50	$1.50	~2,500 queries
GPT-4o	$2.50	$10.00	~400 queries
DALL-E 3 (Standard)	$0.04/image	--	~125 images

Code Example

import openai

client = openai.OpenAI(api_key="sk-your-free-api-key")

# Use the cheapest model to maximize free credits
response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[
        {"role": "system", "content": "You are a helpful assistant."},
        {"role": "user", "content": "Explain Docker in 3 sentences."}
    ],
    max_tokens=150
)

print(response.choices[0].message.content)

Limitations

Credits expire after 3 months
Rate limits: 3 RPM (requests per minute) for GPT-4o on free tier
GPT-4o access has reduced rate limits compared to paid accounts
No access to the newest models (o3, o4-mini) until you add a payment method
One account per phone number

Tips to Stretch $5

Use gpt-4o-mini instead of gpt-4o for 15x more queries
Set max_tokens to limit response length
Cache responses to avoid redundant API calls
Use streaming to detect early if a response is going off-track

# Efficient usage: set max_tokens and use gpt-4o-mini
response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "Summarize this article in 2 sentences."}],
    max_tokens=100,
    temperature=0  # Deterministic output, good for caching
)

Method 2: Azure for Students ($100 Free Credit)

Microsoft Azure offers $100 in free credits to students, and this includes access to Azure OpenAI Service with the same GPT models.

Eligibility

Must have a valid .edu email address
Must be 18+ years old
Available in most countries
No credit card required

Step-by-Step Setup

Go to azure.microsoft.com/en-us/free/students
Click Start Free and sign in with your school email
Verify your student status (usually instant with .edu email)
Once your Azure account is active, go to the Azure Portal
Search for Azure OpenAI in the search bar
Click Create to set up an Azure OpenAI resource
Choose your subscription, resource group, and region
After deployment, go to Azure AI Studio to create model deployments
Deploy the models you want (GPT-4o, GPT-4 Turbo, etc.)
Get your API key from Keys and Endpoint in the Azure portal

Code Example (Azure OpenAI)

from openai import AzureOpenAI

client = AzureOpenAI(
    api_key="your-azure-api-key",
    api_version="2024-10-21",
    azure_endpoint="https://your-resource.openai.azure.com/"
)

response = client.chat.completions.create(
    model="gpt-4o",  # This is your deployment name
    messages=[
        {"role": "user", "content": "What is Kubernetes?"}
    ]
)

print(response.choices[0].message.content)

Advantages Over Direct OpenAI

20x more free credit ($100 vs $5)
12 months to use credits (vs 3 months)
Access to GPT-4o and GPT-4 Turbo with better rate limits
Enterprise-grade features (content filtering, virtual networks)
No credit card required

Limitations

Requires a valid student email
Azure OpenAI Service has a separate approval process (usually 1-2 business days)
Slightly different API format than direct OpenAI
Not all OpenAI models are available (no DALL-E 4, limited Whisper)

Method 3: Free Alternative APIs (No Expiration)

If you need ongoing free access to capable LLMs, several providers offer permanently free tiers that are compatible with the OpenAI API format.

Google Gemini API (Best Free Option)

Google offers the most generous free tier for AI APIs.

import google.generativeai as genai

genai.configure(api_key="your-free-google-ai-key")
model = genai.GenerativeModel("gemini-2.0-flash")

response = model.generate_content("Explain microservices architecture.")
print(response.text)

Get your free key at aistudio.google.com.

Detail	Value
Free rate limit	15 RPM / 1M tokens per minute
Models	Gemini 2.0 Flash, Gemini 2.5 Pro (limited)
Credit card	Not required
Expiration	None

Mistral API Free Tier

Mistral offers free access to their open-weight models.

from openai import OpenAI

# Mistral uses OpenAI-compatible API format
client = OpenAI(
    api_key="your-mistral-api-key",
    base_url="https://api.mistral.ai/v1"
)

response = client.chat.completions.create(
    model="mistral-small-latest",
    messages=[{"role": "user", "content": "What is REST API?"}]
)

print(response.choices[0].message.content)

Groq Free Tier

Groq provides free access with extremely fast inference.

from openai import OpenAI

client = OpenAI(
    api_key="your-groq-api-key",
    base_url="https://api.groq.com/openai/v1"
)

response = client.chat.completions.create(
    model="llama-3.3-70b-versatile",
    messages=[{"role": "user", "content": "Explain Docker Compose."}]
)

print(response.choices[0].message.content)

Free Alternative Comparison

Provider	Free Limit	Best Model	Speed	OpenAI Compatible
Google Gemini	15 RPM	Gemini 2.0 Flash	Fast	No (own SDK)
Mistral	Limited free tier	Mistral Small	Fast	Yes
Groq	30 RPM	Llama 3.3 70B	Very fast	Yes
Together AI	$5 credit	Llama 3.3 70B	Fast	Yes
OpenRouter	$1 credit	Varies	Varies	Yes

Which Method Should You Choose?

Situation	Best Method
Quick prototyping with GPT specifically	Method 1: OpenAI Free Tier
Student building a project	Method 2: Azure for Students
Ongoing development, model-agnostic	Method 3: Free Alternative APIs
Need GPT-4o level quality for free	Method 2 or Gemini 2.5 Pro
Building production apps	Start free, plan for paid

Frequently Asked Questions

Can I use free OpenAI API credits for commercial projects? Yes, there are no restrictions on how you use the free credits. However, $5 will run out quickly at production scale.

Do free credits stack across methods? No. OpenAI and Azure are separate platforms with separate credits.

What happens when my free credits run out? The API stops working. On OpenAI, you need to add a payment method. On Azure for Students, you can upgrade to pay-as-you-go.

Are free alternatives as good as GPT-4o? Gemini 2.0 Flash and Llama 3.3 70B are competitive with GPT-4o for most tasks. For the hardest reasoning tasks, GPT-4o and Gemini 2.5 Pro still have an edge.

Wrapping Up

The easiest path is Method 1 (OpenAI free tier) for quick experiments, Method 2 (Azure for Students) if you qualify, and Method 3 (free alternatives) for sustained free usage. For most developers, Gemini's free tier offers the best ongoing value.

If you are building apps that need AI-generated media like images, video, or avatars alongside language models, try Hypereal AI free -- 35 credits, no credit card required. The API supports all major media generation models at competitive prices.