How can I tell if content was written by AI?

You can't reliably tell if content was written by AI using detection tools alone, because current AI detectors have high false-positive rates, but there are several practical signals you can look for including overly uniform sentence structure, lack of specific personal anecdotes, and unusual factual errors. AI detection tools like GPTZero and Originality.ai claim high accuracy, but independent testing by universities has shown these tools frequently flag human writing as AI-generated, especially for non-native English speakers. A 2024 study from Stanford found that GPT detectors misclassified over 50% of essays written by international students as AI-generated. That's a serious problem. Instead of relying on detectors, look for patterns. AI writing tends to use predictable transitions like 'moreover' and 'furthermore,' maintains a consistent sentence rhythm, and rarely includes specific details like 'my neighbor's dog knocked over my coffee while I was writing this.' Real human writing is messier. It has tangents, imperfect grammar, and oddly specific references. A concrete example: if a blog post claims to review a restaurant but mentions no specific dish names, no wait time, and no sensory details like 'the garlic smell hit me before I opened the door,' it may be AI-generated or at least heavily templated. The honest answer is that AI writing is getting harder to spot, and even experts can't always tell. The better question is whether the content is accurate and useful, not who wrote it. For a deeper dive, see our guide on making AI writing sound less formal. **Related**: Are AI content detectors accurate? | What are the signs of AI-generated text?