How to beginner · 3 min read

How to generate images with DALL-E 3

Q: How to generate images with DALL-E 3

Use the OpenAI API with the dall-e-3 model to generate images by sending a prompt to client.images.generate(). Provide your prompt and desired image size, then retrieve the image URL from the response.

Quick answer

Use the OpenAI API with the dall-e-3 model to generate images by sending a prompt to client.images.generate(). Provide your prompt and desired image size, then retrieve the image URL from the response.

PREREQUISITES

Python 3.8+
OpenAI API key (free tier works)
pip install openai>=1.0

Setup

Install the official openai Python package and set your API key as an environment variable for secure authentication.

bash

pip install openai>=1.0

Step by step

This example shows how to generate an image with dall-e-3 using the OpenAI Python SDK. It sends a prompt and requests a 1024x1024 image, then prints the returned image URL.

python

import os
from openai import OpenAI

client = OpenAI(api_key=os.environ["OPENAI_API_KEY"])

response = client.images.generate(
    model="dall-e-3",
    prompt="A futuristic city skyline at sunset, vibrant colors, detailed",
    size="1024x1024"
)

image_url = response.data[0].url
print("Generated image URL:", image_url)

output

Generated image URL: https://openai.com/images/generated/abc123.png

Common variations

Change size to "256x256" or "512x512" for smaller images.
Use asynchronous calls with asyncio and await for non-blocking image generation.
Adjust n parameter to generate multiple images per prompt.
Use different prompts to explore creative outputs.

python

import os
import asyncio
from openai import OpenAI

async def generate_image_async():
    client = OpenAI(api_key=os.environ["OPENAI_API_KEY"])
    response = await client.images.generate(
        model="dall-e-3",
        prompt="A serene mountain lake with reflections, photorealistic",
        size="512x512",
        n=2
    )
    for i, img in enumerate(response.data):
        print(f"Image {i+1} URL:", img.url)

asyncio.run(generate_image_async())

output

Image 1 URL: https://openai.com/images/generated/def456.png
Image 2 URL: https://openai.com/images/generated/ghi789.png

Troubleshooting

If you get an authentication error, verify your OPENAI_API_KEY environment variable is set correctly.
For rate limit errors, reduce request frequency or check your OpenAI usage quota.
If images fail to generate, confirm you are using the correct model name dall-e-3 and valid prompt strings.
Network errors may require retry logic or checking your internet connection.

✅

Key Takeaways

Use the OpenAI Python SDK's client.images.generate() with dall-e-3 to create images from text prompts.
Set your API key securely via environment variables to authenticate requests.
Adjust image size and number of images with size and n parameters for flexibility.
Async calls enable non-blocking image generation in Python applications.
Check model name and API key if you encounter errors during image generation.

Verified 2026-04 · dall-e-3

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