Update tutorials with gpt-4.1

[Marius1311]

Also update some info on models in the README.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.86%. Comparing base (216c291) to head (497eaeb).
⚠️ Report is 71 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   85.85%   86.86%   +1.01%     
==========================================
  Files           9        9              
  Lines         495      495              
==========================================
+ Hits          425      430       +5     
+ Misses         70       65       -5     

see 2 files with indirect coverage changes

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