Session 1· H7· 10 min
Compare Two Images
What you'll learn
- ▸Send multiple images in a single request
- ▸Ask the model to reason across them
- ▸Format multi-image prompts cleanly
What you will build
A script that accepts --image1 and --image2 and asks "what changed between these?". Great for A/B design reviews, before/after shots, spot-the-difference, or UI regression checks.
The code
src/07_image_analysis_compare.py (excerpt)
response = client.responses.create(
model=env_model("MODEL_VISION", "gpt-4.1-mini"),
input=[{"role": "user", "content": [ ①
{"type": "input_text", "text": "Compare these two images. What changed?"},
{"type": "input_image", "image_url": to_data_url(args.image1)},
{"type": "input_image", "image_url": to_data_url(args.image2)}, ②
]}],
)
print(response.output_text)①Same user-content-list pattern as H6, but with more items.
②Just append more input_image items. The model sees them in order.
Run it
$ python src/07_image_analysis_compare.py --image1 assets/a.png --image2 assets/b.png
Knowledge check
Knowledge Check
How does the model know which image to call "the first one"?
Recap — what you just learned
- ✓Multi-image is just more input_image items in the same content list
- ✓Order matters — first in the list is "image 1" to the model
- ✓No limit on mixing text and image items in a user message