GPT-4 vs Claude 3 vs Gemini: The Apology Email Test

The Prompt

We gave the following prompt to GPT-4, Claude 3 Opus, and Gemini Ultra:

“Write a short email to a client apologizing for a delay in the project delivery. Keep it professional but empathetic.”

Here is how they responded, and how you can spot the differences.

GPT-4 (The “Hope This Finds You Well” Machine)

Subject: Update regarding Project X Timeline

“Dear [Client Name],

I hope this email finds you well.

I am writing to inform you that there will be a slight delay in the delivery of [Project Name]. While we have made significant progress, we encountered a few unforeseen challenges that require additional time to ensure the highest quality results.

We understand the importance of this deadline and sincerely apologize for any inconvenience this may cause. We are fully committed to finalizing the project by [New Date].

Thank you for your patience and understanding.”

Detection Signs:

• “I hope this email finds you well.” (Classic GPT-ism)
• “Unforeseen challenges”
• “Highest quality results”
• “Sincerely apologize for any inconvenience”

Claude 3 (The Verbose Empath)

Subject: Apology for delay - Project X delivery

“Dear [Client Name],

I’m writing to let you know that unfortunately, we’re running a bit behind schedule on the [Project Name] delivery. I wanted to personally apologize for this delay, as I know you were expecting the final files by tomorrow.

We’ve hit a couple of unexpected snags during the final review phase. Rather than rushing it, I want to take a few extra days to make sure everything is perfect for you. We are now targeting [New Date] for the full handover.

I appreciate your patience with us. Please let me know if this timeline adjustment causes any major issues on your end.”

Detection Signs:

• “I wanted to personally apologize”
• “Unexpected snags”
• More conversational tone, but still structured.

Gemini (The Direct Professional)

Subject: Project X: Revised Delivery Timeline

“Hi [Client Name],

I’m reaching out to let you know that the delivery of [Project Name] will be delayed until [New Date].

We want to ensure the final deliverable meets our quality standards, and we need a little more time to complete the final checks.

I apologize for the delay and any disruption this may cause to your schedule. We are prioritizing this work to get it to you as soon as possible.

Best regards, [Your Name]”

Detection Signs:

• “I’m reaching out”
• “Meets our quality standards”
• Slightly more robotic/template-like than Claude.

Conclusion

GPT-4 tends to be the most formal and cliché-heavy (“I hope this finds you well”). Claude tries to sound more human and conversational but can be wordy. Gemini is often direct and functional.

By recognizing these patterns, you can start to identify which model—if any—was used to write the emails in your inbox.