Congratulate my friend Alex on passing the Oxford exam in an email
GPT-3.5
GPT-6 Astra
Subject: Congratulations, Alex! 🎉
Hi Alex,
Huge congratulations on passing the Oxford exam! That’s a fantastic achievement, and you should be really proud of yourself.
I’m so happy for you and excited to see what comes next. Hope you take some time to celebrate—you’ve earned it!
All the best, [Your Name]
What changed
The biggest difference is packaging. GPT-3.5 opens like a helpful clerk, explaining that “you could write an email with a subject line such as…” before handing over the draft. Astra simply writes the email, subject line and all, ready to paste.
Inside the emails, the call is closer. GPT-3.5’s version is warmer and more specific to a friendship: “I know how hard you’ve been working,” “I’m so proud of you,” and a concrete nudge to “catch up soon and celebrate.” That first line does assume details the sender never gave, though most friends would happily keep it. Its “Dear Alex” and “Best regards” feel a bit formal for a pal. Astra strikes a more natural casual tone with “Hi Alex” and a 🎉 in the subject. Its lines are generic, however. “You should be really proud of yourself” could go to anyone who passed anything. Both are perfectly usable. Astra wins on format, while GPT-3.5’s message sounds slightly more like it came from a friend.