Flypost

For release: Wednesday 21 October 2026

AI-written LinkedIn posts get about a quarter fewer reactions, study finds

More than half of LinkedIn posts are now mostly written by AI, a detector check of 2,016 posts found. The same person's AI-written posts earned about 24% fewer reactions and 12% fewer comments than their own writing.

21 October 2026: LinkedIn posts written mostly by AI earn about a quarter fewer reactions than posts the same person wrote themselves, a study that ran 2,016 recent posts through an AI detector has found.

The study, by LinkedIn content studio Flypost, ran one post a month from April to September 2026 for each of 336 B2B creators through Pangram, a dedicated AI-text detector, then compared each person's AI-written posts with the ones they wrote themselves. Flypost sells AI-assisted LinkedIn writing software.

Key findings

  1. AI posts get fewer reactions. Mostly AI-written posts earned about 24% fewer reactions than the same person's human-written posts, in the same format, month and length, across 236 creators who post both ways.
  2. The more AI, the bigger the drop. Posts with no human writing detected at all earned about 32% fewer reactions.
  3. Comments fall too. Mostly AI-written posts drew about 12% fewer comments.
  4. Big and small accounts alike. About 30% fewer reactions for accounts with 1,000 to 10,000 followers and about 35% fewer above 50,000. The middle band, 10,000 to 50,000, showed a smaller gap of about 15%.
  5. AI is now the majority. 54% of the posts were mostly written by AI, and a third had no human writing detected at all.
“We make AI writing tools, so this isn't the answer we wanted. But the data is clear: when AI writes the whole post, people react less. Use it to sharpen what you wrote, not to write it for you.”
Sam Cassman, founder, Flypost
Bar chart: change in LinkedIn reactions on a creator's AI-written posts, compared with their own human-written posts. Mostly AI-written −24%, completely AI-written −32%, image posts only −28%, 1k to 10k followers −30%, 10k to 50k followers −15%, 50k to 500k followers −35%.
Each creator's AI-written posts got fewer reactions than the posts they wrote themselves, across account sizes. Source: Flypost AI-writing check, Oct 2026, posts scored by the Pangram AI detector. Download the chart

Story angles

One study, three versions of the release for different beats. The facts are identical in all three; only the lead and the order of the findings change.

  • Version A: Marketing and LinkedIn tactics writers

    AI-written LinkedIn posts get about a quarter fewer reactions, study finds

    The same person's AI-written posts earn about a quarter fewer reactions than their own writing, and completely AI-written posts do worse still.

    Release A (PDF)

  • Version B: AI and technology reporters

    More than half of LinkedIn posts are now mostly written by AI, study finds

    54% of posts are mostly AI-written, smaller accounts use it most, only 12% of creators never do, and the share held steady for six months.

    Release B (PDF)

  • Version C: Algorithm and platform reporters

    AI-written posts get a quarter fewer reactions as LinkedIn targets “AI slop”, study finds

    As LinkedIn ramps up classifiers to catch AI slop, the same person's AI-written posts earn about a quarter fewer reactions, and AI use hasn't fallen since the slop button arrived.

    Release C (PDF)

Findings

How AI-written posts perform

Each creator's AI-written posts compared with their own human-written posts, in the same format, month and length; 95% interval; creators who post both ways.

Engagement on AI-written posts compared with the same creator's human-written posts
ComparisonEffectIntervalCreators
Reactions: mostly AI-written−24%−33% to −15%236
Reactions: completely AI-written−32%−42% to −21%181
Comments: mostly AI-written−12%−21% to −2%236
Reactions: image posts only−28%−38% to −17%156
Reactions: text-only posts (too few to call)−15%−38% to +13%29
Reactions: 1,000–10,000 followers−30%−43% to −13%86
Reactions: 10,000–50,000 followers−15%−27% to +1%103
Reactions: 50,000–500,000 followers−35%−53% to −13%47

Download the table as CSV

How much of LinkedIn is AI-written

Share of posts judged mostly AI-written; 95% interval; posts checked.

Share of LinkedIn posts judged mostly AI-written
PostsMostly AI-writtenIntervalPosts checked
All posts54%52% to 56%2,016
Posts over 250 words61%57% to 65%547
1,000–10,000 followers63%60% to 67%702
10,000–50,000 followers55%51% to 58%882
50,000–500,000 followers38%34% to 43%432

Download the table as CSV

Bar chart: share of LinkedIn posts judged mostly AI-written. All posts 54%, posts over 250 words 61%, 1k to 10k followers 63%, 10k to 50k followers 55%, 50k to 500k followers 38%.
The smaller the account, the more AI. Source: Flypost AI-writing check, Oct 2026, posts scored by the Pangram AI detector. Download the chart

About the study

Flypost ran 2,016 original LinkedIn posts through Pangram (model pangram-4), a dedicated AI-text detector: one randomly chosen post a month, April to September 2026, from each of 336 English-speaking B2B creators (1,000 to 500,000 followers), picked at random from the 948 in its LinkedIn study who posted every month. Posts are public and were collected through a third-party data provider. A post counts as mostly AI-written when Pangram judged more than half of its text AI-generated or AI-assisted, and completely AI-written when it found no human writing at all. The engagement figures compare each creator's AI-written posts with their own human-written posts, holding format, month and length steady, with 95% intervals from resampling creators. They measure reactions and comments, not views, and cannot rule out that people use AI for posts that would have done worse anyway. No detector is perfect; an August 2025 University of Chicago working paper found Pangram the most accurate of four it tested. Flypost paid about $250 in detector fees, and the study was not independently reviewed. Full method, limits and charts: flypost.io/learn/ai-generated-linkedin-posts-study

What LinkedIn has said, and other published research

Downloads

Charts and data

Press releases

Headshot

Logos

Product screenshots

Media contact

Sam Cassman, founder, Flypost

Available for interview.

About Flypost

Flypost is a LinkedIn content studio that turns a company's own material (posts, transcripts, case studies) into LinkedIn posts, carousels and articles. flypost.io

Read the full study: method, limits and charts