Can companies detect whether I used ChatGPT for my application?

Increasingly yes — but not reliably. WEF Future of Jobs 2025: 38% of surveyed companies plan to deploy AI detection tools. Current detection tools (GPTZero, Originality.ai) have documented error rates — they produce false positives (genuine texts flagged as AI) and false negatives (AI texts not detected). EU AI Act: if companies use AI detection, this must be transparent. NIST AI RMF: AI detectors are not reliable evidence. Practical recommendation: the issue is not detectability but quality and authenticity. An AI-assisted text that has been heavily revised, contains personal examples, and reflects your voice is unproblematic.