How does Paperxify's AI Detector work?

Paperxify's AI Detector analyzes text using a multi-model ensemble trained to recognize linguistic patterns from major LLMs including GPT-4o, Claude 3.5, Gemini 1.5, Llama 3, and Mistral. It returns a document-level score and per-sentence confidence highlighting.

Is Paperxify's AI Detector free?

Yes. The free tier allows you to check up to 5,000 characters per scan without any account. Pro subscribers get unlimited-length document scanning, bulk URL checking, and API access.

Does the detector work for Claude and Gemini text?

Yes. Unlike many detectors that focus only on ChatGPT, Paperxify's multi-model system is trained to recognize content from Claude, Gemini, Mistral, Llama, and other frontier models.

How accurate is the AI Detector?

Paperxify achieves above 96% accuracy on standard academic benchmarks including HC3, MixSet, and RAID datasets. Accuracy may vary on very short samples or heavily edited content.

Can I use it to check student papers for AI usage?

Yes. Educators can paste student submission text for AI usage analysis. Pro accounts get batch document upload to check multiple papers simultaneously.

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Multi-Model AI Content Scanner

AI-Powered Content Detector with Per-Sentence Confidence Scores

Submitting AI-generated content can have serious academic consequences. Paperxify's AI Detector uses a multi-model ensemble to flag text from ChatGPT, GPT-4o, Claude 3, Gemini, and other major LLMs — with per-sentence confidence percentages so you know exactly which passages are at risk.

Multi-Model Detection

Detects GPT-4, Claude, Gemini, Llama, and more — not just ChatGPT. Over 96% benchmark accuracy.

Per-Sentence Breakdown

Color-coded highlight report shows exactly which sentences are AI-generated and which are human.

Highly Rated

"I ran my essay draft through Paperxify's AI detector before submission and caught 4 AI-flagged paragraphs I forgot to rewrite. Saved my academic standing."

David Miller

CS Major, Stanford University, US

Capabilities Comparison

Why students and academic professionals globally choose Paperxify.

Capabilities	Paperxify AI Detector	GPTZero	Turnitin AI
Multi-LLM Detection (GPT + Claude + Gemini)	Yes (All Major Models)	Partial (GPT focused)	Partial (Limited models)
Per-Sentence Confidence Score	Yes (Color-coded report)	Yes (Document-level)	No (Score only)
Free Tier Available	Yes (Generous free tier)	Limited (Paid wall)	Institutional only
Humanizer Integration	Yes (One-click Humanize)	None	None

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Free AI Detector — Check ChatGPT, GPT-4, Claude & Gemini Text | Paperxify