Using Haiku many of the answers which should be incorrect are now correct on first pass. Exercises likely need to be updated.

Examples include lesson 4 not putting in "Dear Claude" but rather "Dear [your Name] " still wrong since it signs with [Your Name] as well.
Lesson 3. the logic problem "Jack is looking at Anne. Anne is looking at George. Jack is married, George is not, and we don’t know if Anne is married. Is a married person looking at an unmarried person?" it gets it correct the first time but with poor rationale.
Says its using model claude-3-haiku-20240307