Claude AI Detector

Claude, developed by Anthropic, is a widely used AI writing assistant. Claude's output is distinctive: it tends to be measured and thoughtful in tone, frequently uses qualifying language ("It's worth noting," "This is a nuanced topic"), and often presents multiple perspectives before settling on a position. Claude also has a characteristic tendency to be transparent about limitations and uncertainties, which can make its writing harder to judge with simple detectors.

Coda One's Claude AI Detector is built to catch these specific patterns. Our statistical model identifies Claude's signature sentence structure -- typically longer, more complex sentences with multiple clauses compared to other AI models. The pattern model detects Claude-specific hedging phrases, its distinctive paragraph-opening styles, and its tendency to use semicolons and em dashes more frequently than human writers typically do. The ensemble model combines these signals for a broader detection view.

Claude's writing has evolved across versions, which means detection also needs to be handled carefully. Whether you're checking content potentially written by Claude Instant, Claude 3 Haiku, Claude 3.5 Sonnet, or newer versions, the detector looks for underlying patterns rather than pretending to fingerprint a single version perfectly. You can open the tool in the web app and start the first review pass in your browser as needed.