Copyleaks is a widely deployed content integrity platform that pairs plagiarism detection with AI content detection across more than 100 languages, and it's common in schools and enterprise publishing. Copyleaks isn't part of the HumanizerEval benchmark yet; see the leaderboard for how popular humanizers, including StealthGPT, perform against leading detectors.
The detector
Copyleaks is a content integrity platform founded in 2015 that expanded into AI content detection in 2023, now serving educational institutions, enterprise publishers, and compliance teams across more than 100 languages. It uses machine learning to analyze the linguistic patterns, sentence structure, and statistical text properties that distinguish human from AI writing, bundling AI detection alongside traditional plagiarism checking in a single submission workflow. Copyleaks integrates with major LMS platforms including Canvas, Moodle, Google Classroom, and Blackboard, making it one of the more broadly deployed institutional content integrity tools available.
Benchmark
HumanizerEval puts popular AI humanizers, including StealthGPT, through the same texts and leading AI detectors, and publishes every score. Copyleaks isn't in the panel yet. Check the leaderboard to compare how each tool performs.
Copyleaks documents section-level classifications with text positions in its AI Text Detection API response. This gives a reviewer a way to connect the result with the passage being discussed. For an article or essay, keep the surrounding paragraph available when recording editorial notes so the passage stays connected to its argument and sources.
The documented response includes the detection model version and scan metadata, alongside the human and AI summary fields. The summary describes the share of words assigned to each classification. Organize these details together when a writing project moves between an author, editor and reviewer.
Yes. Its API response describes classified sections and their text positions, allowing a report to connect a classification with a particular passage.
The documented API response includes a modelVersion field, along with scan metadata. These fields help identify the setup associated with a saved result.
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StealthGPT is built to make AI-written text read as human across leading AI detectors, including Copyleaks' AI detection layer. Copyleaks isn't part of HumanizerEval's benchmark yet, so we don't publish a bypass rate for it. See the HumanizerEval leaderboard for how popular humanizers, including StealthGPT, perform against leading detectors.
Copyleaks is a content integrity platform that combines plagiarism detection with AI content detection, using machine learning to analyze the linguistic and statistical patterns that distinguish human from AI writing across 100+ languages. It integrates with major LMS platforms and is used across educational institutions and enterprise publishing teams worldwide. Copyleaks can be contrasted closely with Originality.ai, which also serves publisher facing content verification but focuses exclusively on AI detection without LMS integration.
StealthGPT's AI humanizer rewrites AI generated content to introduce the structural variation, lexical diversity, and natural unpredictability that distinguish human writing from AI output. StealthGPT's AI humanizer is trained to target the specific signals each major detector uses and is continually updated as those detectors evolve.
StealthGPT is tested monthly in HumanizerEval, its open benchmark. Copyleaks isn't in HumanizerEval's detector panel yet; when it's added, this page will show StealthGPT's result.
See the HumanizerEval leaderboard for how StealthGPT and other popular humanizers perform against leading AI detectors, with every score published.
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