You used em dashes your whole life. Then one day, the internet decided that made you a robot.

The moment everything changed

Somewhere in late 2024, a strange new consensus started forming online. It began, as these things often do, on Reddit. Users on r/ChatGPT noticed that ChatGPT had a very particular fondness for the em dash. It used them constantly, sometimes multiple times per paragraph, to insert asides, pivot between ideas, and add dramatic pauses. Then someone called it a "ChatGPT hyphen." The phrase stuck. Within months, the em dash went from being a beloved punctuation mark, one that writers like Emily Dickinson, Virginia Woolf, and countless modern essayists relied on, to being treated as a smoking gun. If your email had an em dash in it, you were clearly using AI. If your essay used one, your professor might flag it. If your Slack message contained one, your coworker might raise an eyebrow. The irony? The em dash is perfectly grammatically correct. It always has been.

What an em dash actually is

For those who have never thought much about punctuation, the em dash is the long dash ( — ) that sits between words without spaces. It is different from a hyphen (-) and an en dash (–). Writers use it to:

Style guides from the Chicago Manual of Style to the AP Stylebook have long endorsed its use. The New York Times standards editor once had to tell staff to stop using it so much, all the way back in 2011, well before ChatGPT existed.

Why AI loves them too

Large language models like ChatGPT were trained on enormous amounts of human writing: books, articles, essays, forum posts. Em dashes were everywhere in that training data. As Brent Csutoras put it, "Humans used them so often that AIs learned them as a default natural flow. It's like asking a bird not to chirp." But there is a twist. AI does not just use em dashes at the same rate as humans. It overuses them. As one Reddit user pointed out, if AI used em dashes at a natural human frequency, nobody would have noticed. The issue is amplification. When the model is deciding what token to predict next, the em dash is a safe, flexible choice. It can lead anywhere: a clarification, a pivot, a continuation. So the model reaches for it more often than a human would. That overuse is what made people notice. And once people noticed, the association stuck.

The video that spread it

The conversation really took off when creators on TikTok and YouTube started making videos about it. TikTok user @foxtomas posted a video titled "AI ruined em dashes" that racked up thousands of likes. Elle Cordova made a viral TikTok exploring whether em dashes are truly a sign of AI-generated text. On YouTube, videos like "Here's Why ChatGPT Keeps Using — in Its Writing" broke down the technical reasons behind the pattern. These videos reached audiences far beyond the writing and tech communities. Suddenly, people who had never heard the term "em dash" before were confidently declaring it an AI tell.

The real cost: self-censorship

Here is where things get genuinely sad. Real writers, people who have loved and used em dashes for years, started second-guessing themselves. On Hacker News, one commenter wrote that "the em dash is now a GPT-ism and is not advisable unless you want people to think your writing is the output of an LLM." On Reddit's r/WritingWithAI, a user confessed to feeling scared to use em dashes even though they write about AI tools for a living. Some professionals started comma-splicing their work emails on purpose, introducing grammatical errors just to seem more human. Others removed em dashes from drafts and replaced them with weaker alternatives. The Guardian's Emma Beddington wrote about the absurdity of it all: "Not only am I losing my livelihood to AI, now it's stealing my em dashes too." Brian Phillips at The Ringer put it best: "It would be a tragedy if writers stopped using em dashes out of fear of sounding like AI, because em dashes are one of the best tools writers have for not sounding robotic in the first place." He argues that the em dash is the most human punctuation there is, precisely because it mirrors the way we actually think, rushing forward, suddenly swerving, forking into different branches.

Em dashes are not a reliable AI detector

Researchers and linguists have been clear on this point. Daphne Ippolito, a senior scientist at Google Brain, told MIT Technology Review that if you want to spot AI writing, you should look at word frequency patterns (how often AI uses "the," for example) or the suspicious absence of typos. Em dashes are not a meaningful signal. As Plagiarism Today noted, even if em dash frequency were a useful indicator today, it will not be tomorrow. AI systems and their users adapt quickly. The goalposts will keep moving. Trying to detect AI through a single punctuation mark is, at best, a parlor trick.

What this is really about

The em dash panic is not really about punctuation. It is about a deeper anxiety: that AI is making it impossible to tell what is human and what is not. When people flag em dashes as "AI writing," they are grasping for simple rules in a world that no longer has them. But simple rules do not work here. Good writing has always varied wildly in style. Some humans write with em dashes. Some do not. Some AI output avoids them entirely. Judging authenticity by punctuation is like judging a painting's authenticity by the brand of paint. The real question is not whether a specific punctuation mark appears in a text. It is whether the ideas, the voice, the specificity, and the imperfections feel like they came from a person with something to say.

For those of us who love em dashes

If you have been using em dashes since before ChatGPT existed, you are not alone. You are also not a robot. You are a person who appreciates a versatile, expressive punctuation mark that has been part of English writing for centuries. Use them. Do not let a moral panic built on Reddit threads and TikTok videos take them away from you. McSweeney's published what became their most-read article of 2025: a satirical piece titled "The Em Dash Responds to the AI Allegations," written by Greg Mania. Its opening line? "I would like to address the recent slander. Listen here, my good bitch." That about covers it.

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