There is no fixed solution to prevent your students from using large language models to cheat on assignments.
But, I have a few recommendations:
- Evaluate the answer to look for any errors an AI would make, like using the wrong character references.
- Try to run the assignment through such an AI first to establish a baseline, and compare the answers of your student to this baseline
- Make the students do the assignment under supervision

The use of large language models is still very new, so creative solutions to prevent students from cheating are still being investigated.
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