# W5 | openai/gpt-5.6-luna | run 1

## Prompt

Write an apology email to a client. We missed the agreed delivery date by a week due to an internal mistake (not their fault); the client is frustrated. Be sincere, take responsibility, offer a concrete next step, don't grovel. Under 130 words.

## Response

Subject: Apology for the Delayed Delivery

Hi [Client Name],

I’m sorry we missed the agreed delivery date by a week. This was caused by an internal mistake on our side—not anything you did—and we take full responsibility for the delay.

I understand the frustration this has caused, especially after you planned around the original timeline. We are completing the remaining work now and will deliver the final materials by [specific date/time]. I’ll personally confirm delivery and keep you updated if anything changes.

Thank you for your patience. We’re reviewing our process to prevent this from happening again.

Best,  
[Your Name]
