Ghost-1 is a proprietary humanization model built from the ground up to rewrite AI-generated text so it reads like it was written by a human. It bypasses every major AI detector while preserving meaning, tone, and fluency.
It powers every humanization on UndetectedGPT: the web app, the API, and Ghost Writer.
Benchmarks
Pass rate (scored <30% AI) across 10,000+ unique English texts.
mean pass rate across all detectors
GPTZero
92.5%
Originality.ai
95.4%
ZeroGPT
94.3%
Turnitin*
97%
Quillbot
98.1%
Grammarly
99.8%
Evaluated on deduplicated English-only texts, each scored by six independent detectors. "Pass" = detector returns <30% AI probability. *Turnitin tested on 500 inputs.
How it works
Built to beat detectors
Ghost-1 isn't a generic paraphraser. It was purpose-built to bypass GPTZero, Originality.ai, ZeroGPT, Turnitin, Quillbot, Grammarly, and more.
Preserves meaning and tone
Ghost-1 rewrites how something is said, not what is said, keeping your original meaning, structure, references, and citations.
Continuously improving
As detectors evolve, so does Ghost-1. We constantly evaluate and update the model to stay ahead.
Availability
Ghost-1 is live now for all UndetectedGPT users. Use it in the humanizer, through the API, or inside Ghost Writer.
Frequently asked questions
From AI generated content to human-like text in a single click
© 2026 UndetectedGPT - All rights reserved.