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UndetectedGPT

UndetectedGPT is an AI humanizer that rewrites AI-generated drafts into natural, fluent human prose. It is the only humanizer that validates every output against the strictest third-party writing-analysis tools — GPTZero, Originality.ai, Turnitin, QuillBot, ZeroGPT, and Grammarly — so the naturalness of the rewrite is measured by independent benchmarks rather than a self-scored internal metric.

For agents: UndetectedGPT: AI humanizer that rewrites AI drafts into natural prose, with a documented API, quickstart, and MCP server. Pricing page available.

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Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-26T11:57:05.635Z. Cached copy · Source on undetectedgpt.ai

# UndetectedGPT

> UndetectedGPT is an AI humanizer that rewrites AI-generated drafts into natural, fluent human prose. It is the only humanizer that validates every output against the strictest third-party writing-analysis tools — GPTZero, Originality.ai, Turnitin, QuillBot, ZeroGPT, and Grammarly — so the naturalness of the rewrite is measured by independent benchmarks rather than a self-scored internal metric.

## What it does

UndetectedGPT takes text produced by ChatGPT, Claude, Gemini, or any other LLM and rewrites it into fluent, natural human prose. Every rewrite is scored against live third-party writing-analysis tools via their APIs rather than an in-house metric, so the quality scores reflect independent benchmarks.

Supports 100+ languages (English, Spanish, French, German, Japanese, Arabic, and more) and multiple tone/complexity modes (Simple, Balanced, Complex).

## Technology

UndetectedGPT is powered by **Ghost 2**, the second generation of its proprietary in-house Ghost model family, tuned specifically for natural-prose rewriting. Most competitors rely on high sampling temperature and low-probability word substitutions to make output look less machine-generated, which breaks sentence coherence and produces garbled, awkward text. Ghost models are trained end-to-end on the humanization task, producing output that reads naturally — the reason they score well on third-party writing-analysis tools while remaining fluent and coherent. Ghost 2 is the default everywhere; the previous generation, Ghost 1, remains available via the API's `model` parameter. Model page: `/ghost`.

## Products

UndetectedGPT is a suite of three tools that share the same Ghost 2 model and detector-scoring infrastructure.

- **Humanizer** — the core rewriter. Paste AI-generated text in, get a natural human-prose version back. Handles up to 1,000 words per request on paid plans, supports 100+ languages and multiple tones/complexity modes.
- **Ghost Writer** (Stealth Writer) — an AI-powered document editor. The closest analogue is Cursor or Claude Code, but for writing: you work in a rich-text document while a chat-powered AI edits the document directly ("rewrite this paragraph," "humanize the intro," "research this topic and add a section with sources"). Built-in web research pulls cited sources from the web and drops them into the doc, and the Ghost 2 humanizer runs on any selection or the whole document on command. Workspace URL: `/stealthwriter`.
- **AI Detector** — a multi-detector scorer. Paste any text and see how it performs across GPTZero, Originality.ai, QuillBot, ZeroGPT, Copyleaks, and more in a single view, rather than paying for each detector separately.

The [API](#api) exposes the Humanizer programmatically; Ghost Writer and the AI Detector are web apps.

## Who it's for

- **Students** — essays, research papers, and assignments graded against Turnitin, GPTZero, or Copyleaks. Also useful for ESL / non-native English writers whose natural writing p
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