The cover letter: what gets it binned in thirty seconds

The 2026 numbers say two apparently contradictory things. On one side, a majority of recruiters say they can recognise an AI-written cover letter, and many judge it unfavourably. On the other, when a thousand recruiters are shown letters without being told which were generated, 82% get at least one wrong. Both are true, and the contradiction is only apparent: what they recognise is not the machine, it is the generic.

What triggers rejection

One survey reports that 61% of hiring managers spend under thirty seconds on an obviously generated letter, against two to three minutes on one that sounds authentic. The phrases that trigger that reflex are always the same: "I am writing to express my strong interest", "proven track record", "I believe my skills and experience align perfectly", "your company, a leader in its field", "thank you for your consideration". They share one trait: they could be sent to anyone.

Three measurable markers

Beyond phrasing, generated text leaves traces you can count. Sentences all run roughly the same length, whereas a human alternates a six-word sentence with a twenty-five-word one. Essay connectors keep appearing ("furthermore", "moreover", "additionally"). And numbers are missing, because a machine that does not know your record cannot invent them safely.

The structure that works

A useful letter holds five movements and two hundred and fifty words. The posting's need, quoted as written. The achievement that answers it, with its number. The objection handled before it is raised: what you lack, said plainly. A real question about their context, one only a person who read the ad could ask. And a dated ask, not a waiting formula.

The test to run before sending

Reread your letter and ask one question: "could this sentence be sent to another company unchanged?" Every sentence that answers yes has to go. What remains is your letter.