StealthGPT passed ZeroGPT on 84% of texts (42 of 50) in HumanizerEval's October 2026 review, where every output was scored through ZeroGPT's API. ZeroGPT is a widely used free AI checker, popular with students, bloggers and freelance writers who want a quick read on whether text looks machine-written.
The detector
ZeroGPT is a web-based AI text detector that sits inside a larger suite of writing tools, including a plagiarism checker, a paraphraser and its own humanizer. Its detection model, which ZeroGPT brands DeepAnalyse, scores text for signs of output from models such as ChatGPT, Gemini, Claude and DeepSeek. Results come back as an overall AI percentage with the suspect sentences highlighted. Paid plans add batch file uploads, PDF reports and API access, and ZeroGPT also runs as a chatbot inside WhatsApp and Telegram.
Benchmark
StealthGPT ranked #1 of 11 humanizers in HumanizerEval's October 2026 review.
HumanizerEval ran 11 AI humanizers, including StealthGPT Super, on the same 50 English texts, 364 to 997 words each. Every output was scored through ZeroGPT's API using its default model. An output counts as a pass only when ZeroGPT's overall verdict is human, meaning a human score above 50%; mixed and uncertain verdicts count as fails. The review ran on October 22, 2026, and every per-text score is published in a public CSV.
StealthGPT passed ZeroGPT on 42 of 50 texts (84%). The remaining 8 texts were flagged or marked unclear. ZeroGPT was one of the most lenient detectors in the panel, with the average tool passing 83% of texts, so the bigger test is Pangram, where StealthGPT passed 88% and the average tool passed 18%.
ZeroGPT pass rate, all 11 humanizers, October 2026
| Humanizer | ||
|---|---|---|
| Undetectable.ai | 100% | |
| WriteHuman | 96% | |
| Grubby | 96% | |
| Rephrasy | 92% | |
| HIX Bypass | 92% | |
| RewriteAI | 90% | |
| Humbot | 88% | |
| BypassGPT | 88% | |
| StealthGPT Super | 84% | |
| Phrasly | 82% | |
| Ryne | 4% | |
StealthGPT also passed all 6 detectors on 17 of 50 texts, more than any other tool.
StealthGPT Super passed 42 of 50 texts (84%) on ZeroGPT in HumanizerEval’s October 22, 2026 review.
Across the six-model panel, StealthGPT Super passed all six detectors on 17 of 50 texts. See the full rankings for the detector-by-detector breakdown.
ZeroGPT API · default model setting. The review used 50 English texts per humanizer, 364–997 words each.
ZeroGPT presents highlighted sentences alongside its overall percentage gauge. Its product page also describes PDF reports and batch file uploads. Those features serve different stages of review: highlights help you locate a passage, while a saved report gives you a record to keep with the document. For a longer article, organize your notes by section so you can work through the draft without losing its structure.
ZeroGPT’s toolkit includes AI detection, plagiarism checking, grammar tools and summarization. Its FAQ describes workflows such as essay review, editorial quality assurance and vendor submissions. A useful way to organize a project is to keep the draft, source checks and final report in one review folder. That lets a writer or editor move from drafting to humanization and final document review without mixing up versions.
ZeroGPT’s product page describes downloadable PDF reports. Saving a report beside the reviewed file helps you keep a clear record of the document and result used in your editorial workflow.
Choose the AI/GPT Detector for that task. ZeroGPT lists plagiarism checking, grammar review and summarization as separate tools within its broader toolkit, so you can organize those checks as their own stages.
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Yes. In HumanizerEval's October 2026 review, StealthGPT passed ZeroGPT on 42 of 50 texts (84%) and registered as human written under ZeroGPT's AI detection scoring.
ZeroGPT is a free, web-based AI text detector. Its detection model, which ZeroGPT brands DeepAnalyse, analyzes text in multiple stages to judge whether it was written by AI, and it's trained on internet text, educational datasets and synthetic AI text from a range of language models. It returns an overall AI percentage and highlights the sentences it attributes to AI.
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.
HumanizerEval reruns its benchmark every month, and StealthGPT is tested in every review. The latest ZeroGPT result is 84%, from the October 2026 review. See HumanizerEval for the newest numbers.
In HumanizerEval's October 2026 review, StealthGPT passed Pangram on 88% of texts, GPTZero, Originality.ai Turbo and Winston AI on 92% each, ZeroGPT on 84% and Originality.ai 5.0 on 34%, for an 80.3% average bypass rate and the #1 rank among 11 humanizers. It passed all six detectors on 17 of 50 texts.
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