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Generative AI
Oct 1, 2026

Study identifies common characteristics of AI-generated writing

Oct 1, 2026
AI Summary

A recent study by Graphite analyzed the writing habits of various AI models, revealing distinct patterns that differentiate AI-generated text from human writing. The research found that while some previous indicators of AI writing have diminished, new telltale phrases and constructions persist across different models.

Study identifies common characteristics of AI-generated writing
  • Researchers from Graphite examined the writing habits of AI models, identifying 13,000 phrases that are significantly more common in AI-generated content compared to human writing.
  • Claude Opus 5.5 frequently uses the word 'dependable' and the phrase 'this matters,' appearing 116 times more often than in human samples.
  • OpenAI's Astra model tends to use phrases like 'another dimension' and employs 'corrective framing' constructions more than 100 times more frequently than humans.
  • Both Opus 5.5 and Astra have significantly reduced their use of em-dashes, with Opus 5.5 using it 99% less than human writing.
  • Despite efforts to create more human-like writing, the overall number of tells remains consistent across different AI models, indicating challenges in completely eliminating these patterns.
  • Graphite's findings suggest that while models may become more sophisticated, certain telltale phrases and constructions continue to emerge.
ai writingopus 5.5language modelstext generationdependability