How to Use AI to Write a Cover Letter That Doesn't Sound Like Everyone Else's

The short answer: Paste your resume and the job description into Claude or ChatGPT, explain why you want the role in a sentence or two, and ask it to write a cover letter. Personalise the output with specifics, and you’re done.

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Cover letters have a reputation for being a chore — and honestly, that reputation is earned. Most people write the same vague letter over and over, tweaking the company name and hoping for the best. Most hiring managers skim them for ten seconds and move on.

AI doesn’t fix the format. What it does fix is the blank page problem — and the “I have no idea how to make this sound good” problem. Used well, it helps you write something specific, coherent, and worth actually reading.

Here’s how to do it.

Before you start: what to have ready

The quality of your cover letter depends almost entirely on what you give the AI. The more specific your input, the more specific — and effective — your output.

Gather:

• Your resume (or at minimum, your work history and key accomplishments)
• The full job description
• The company name and, if you know it, the hiring manager’s name
• One or two genuine reasons why you want this specific role at this specific company

That last point matters more than people think. “I’m excited about this opportunity” is filler. “I’ve followed your product for two years and I’m particularly interested in the accessibility work you’ve been doing” is a hook.

Step 1: Write your cover letter prompt

Open Claude or ChatGPT and try something like this:

“Please write a cover letter for the following job. My resume is below. Keep it to three or four short paragraphs, professional but not stiff, and make it specific to this role rather than generic. Here’s the job description: [paste it]. Here’s my resume: [paste it]. The company is [name] and I’m interested in this role because [your actual reason].”

The AI will produce a first draft. It won’t be perfect — and it shouldn’t be. It’s a starting point, not a finished product.

Step 2: Fix the opening line

The opening line is the most important sentence in the letter and the one AI gets wrong most often. It tends to produce openers like:

“I am writing to express my strong interest in the Marketing Manager position at Acme Corp.”

Which is fine, technically. But it’s also what every other letter starts with. Try asking:

“Can you rewrite the opening sentence to be more direct and engaging? I want it to lead with something specific — either a relevant accomplishment or a concrete reason I want this role — not just ‘I am writing to express interest.’”

A better opener might be something like: “When I saw this role, two things jumped out — the focus on [specific thing] and the chance to [specific opportunity].” That’s not a template. It’s an invitation to keep reading.

Step 3: Add the details that AI can’t invent

Here’s the honest limitation: AI can write well-structured, professional prose, but it doesn’t know your actual story. After the first draft, go through and add:

• A specific accomplishment that’s relevant to this role (with a number if you have one)
• Something genuine about the company that you actually know or find interesting
• Any personal connection to the industry or problem the company solves

These are the details that separate a cover letter that sounds human from one that sounds generated. The AI writes the structure; you fill in what only you can fill in.

Step 4: Make it shorter

AI tends to write more than you need. Most cover letters should be three short paragraphs:

1. Why this role, why this company
2. The most relevant thing about your background (one or two specific examples)
3. A brief, confident close

If the AI gives you five paragraphs, ask it: “Can you cut this down to three tight paragraphs without losing the key points?”

Step 5: Read it as the hiring manager

Before you send anything, read the letter once through the eyes of someone who’s read fifty cover letters this week. Ask yourself:

• Does the opening give me a reason to keep reading?
• Is there at least one specific, concrete thing about this candidate?
• Does it sound like a real person wrote it?
• Is there anything in here that could apply to literally any job at any company?

If the answer to that last question is yes, cut it. Generic filler doesn’t help you — it just adds words.

The five-minute tailoring trick

Once you’ve written your first AI-assisted cover letter well, future ones take about five minutes. Keep a “base” version that captures your core background and voice. For each new application:

“Here’s my base cover letter [paste it]. Here’s the new job description [paste it]. Please rewrite it to fit this specific role and company while keeping my voice and the general structure.”

Done. Review, add any company-specific details, and send.

Pair it with a strong resume

Your cover letter and resume work together. If you haven’t already used AI to sharpen your resume, how to use AI to write a resume walks through the whole process — including how to add real numbers and avoid the generic bullet point trap.

And if you want to get better at prompting AI generally — not just for job applications — what is a prompt and how to talk to AI is worth five minutes of your time.

Frequently asked questions

Can AI write a cover letter for me? Yes. Give an AI tool like Claude or ChatGPT your resume, the job description, and a bit about why you want the role, and it can draft a strong cover letter in under a minute.

Will hiring managers know my cover letter was written by AI? Not if you personalise it properly. Generic AI output is obvious, but a cover letter that includes specific details about the company, the role, and your actual experience reads as human. The key is adding real specifics, not accepting the first draft wholesale.

How long should an AI-written cover letter be? Three to four short paragraphs is the sweet spot — about half a page. Hiring managers read a lot of these. Short and specific beats long and impressive every time.

Should I write a new cover letter for every job? Yes, and AI makes this much faster. You keep your core template and ask the AI to tailor it to each new job description. It takes about five minutes instead of an hour.