A text-only model cannot understand an image. Choose a supported vision model and test it on the exact screenshots, charts, or photos used in your work.
Vision needs a different model
A normal text model reads text tokens. A vision-language model can also receive an image and produce text about it. The model and engine must both support the vision input.
Do not assume every model in a family can see images. Check the exact model variant and the engine documentation.
Match the model to the image job
- Use screenshot tests for software support and interface questions.
- Use document-image tests for forms, scans, and receipts.
- Use chart tests for labels, numbers, and comparisons.
- Use photo tests for visible objects and conditions.
- Do not use a general vision model as a medical or safety authority.
Resolution changes the result
Small text and fine details may disappear when an image is reduced. Larger images can also require more processing time and memory.
Use clear crops when possible. Keep the important area large enough to read, and do not send private parts of the screen that the model does not need.
Build a visual test
- Collect twenty real images without private information.
- Write the expected facts before testing.
- Include blurry, crowded, and difficult examples.
- Record missed text, invented objects, and wrong numbers.
- Test the same images with the same prompt.
- Set a pass mark for the exact job.
Use human checks
A vision model can sound certain when it is wrong. Let the user open the original image beside the answer. Ask for the visible evidence behind important claims.
For money, health, security, or safety decisions, use the model only as an assistant and require a qualified person to confirm the result.
Official references used
These primary sources support the technical concepts in this guide. Product behavior changes, so verify the current documentation before deployment.
Find a model your computer can run.
The LocalLens advisor applies conservative memory rules and tells you when the evidence is insufficient.
Run the free compatibility check →This guide is educational and reviewed for practical accuracy. Model software, licenses and hardware support change; verify official sources before a production deployment.