The detector schools and enterprises actually trust

Copyleaks started as a plagiarism checker and became one of the most accurate AI-detection engines on the market. It flags content from ChatGPT, GPT-4, Claude, Gemini, and even paraphrased/translated text — with published accuracy around 99%. For universities and HR teams that need defensible results, it is the safe pick.

Who it's for: Educators, publishers, enterprises, and anyone who must verify whether text was written by a human or an LLM.

Key features

AI detector Multi-model

Detects output from ChatGPT, GPT-4, Claude, Gemini, and LLaMA families.

Paraphrase radar Beat the rewrites

Flags text run through spinners and paraphrasing tools, not just raw AI output.

Plagiarism Cross-web scan

Compares against billions of web pages and academic sources.

API + LMS Bulk at scale

Integrate via API or LMS plugins to scan thousands of submissions.

The honest take

✓ What works

Among the highest published detection accuracy
Catches paraphrased and translated AI text
LMS + API integrations for institutions
Free single-document scan

✗ What doesn't

Accuracy still slips on human-edited text
UI is dense and enterprise-y
Per-seat pricing adds up for teams
False positives can unfairly flag students

Verdict

For institutions that need defensible AI detection, Copyleaks is the most trustworthy option in 2026. Pair it with a human review step and it is hard to beat. Individuals should start with the free scan before paying.

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