StealthGPT vs GPTZero: Does StealthGPT Bypass GPTZero?
StealthGPT bypasses GPTZero at a 99% rate based on internal testing conducted in August 2026 across thousands of documents varying from academic to professional in writing style. GPTZero is among the most widely adopted AI detectors in general, built on perplexity and burstiness signals that distinguish human from AI writing. StealthGPT's humanization engine is specifically designed to shift these signals.
The detector
What is GPTZero?
GPTZero is an AI content detection tool developed by Edward Tian and launched in January 2023, widely adopted across K‑12 and university settings. It analyzes text for perplexity, how predictable each word choice is given the surrounding context, and burstiness, how much sentence complexity varies throughout a document. AI writing tends to score low and uniform on both metrics; human writing tends to score higher and less predictably.
Benchmark
How StealthGPT Performs Against GPTZero
Methodology:
Over 10,000 AI generated documents varying in writing style, from academic essays to professional summaries, were humanized through StealthGPT and then submitted to GPTZero for scoring. GPTZero measures perplexity and burstiness across each submitted document to produce an AI probability score, two signals StealthGPT's humanization model is directly trained to address. The test was conducted under standard submission conditions using GPTZero's full document scan. Testing was conducted in August 2026, with documents ranging from 500 to 3000 words in length.
Results:
99% of StealthGPT's humanized outputs scored below GPTZero's AI detection threshold and registered as human written. The remaining 1% fell in GPTZero's unclear or likely AI range.
How humanizers stack up against GPTZero
Bypass rate against GPTZero first, then what each tool actually offers.
| Feature | StealthGPT | Undetectable.ai | HIX Bypass | Humbot |
|---|---|---|---|---|
| Bypass performance vs GPTZero | ||||
| GPTZero | Strong | Unknown | Unknown | Unknown |
| Core features | ||||
| AI Humanizer | Supported | Supported | Supported | Supported |
| AI Detector / checker | Supported | Supported | Supported | Supported |
| Stealth WriterGenerate from scratch, undetectable | Supported | Not supported | Not supported | Not supported |
| Stealth AgentResearch + draft + humanize in one flow | Supported | Not supported | Not supported | Not supported |
| Platform & access | ||||
| Team accounts | Supported | Not supported | Not supported | Not supported |
| API access | Supported | Not supported | Not supported | Not supported |
Bypass performance vs GPTZero
- StealthGPT
- Strong
- Undetectable.ai
- Unknown
- HIX Bypass
- Unknown
- Humbot
- Unknown
AI Humanizer
- StealthGPT
- Supported
- Undetectable.ai
- Supported
- HIX Bypass
- Supported
- Humbot
- Supported
AI Detector / checker
- StealthGPT
- Supported
- Undetectable.ai
- Supported
- HIX Bypass
- Supported
- Humbot
- Supported
Stealth Writer
Generate from scratch, undetectable
- StealthGPT
- Supported
- Undetectable.ai
- Not supported
- HIX Bypass
- Not supported
- Humbot
- Not supported
Stealth Agent
Research + draft + humanize in one flow
- StealthGPT
- Supported
- Undetectable.ai
- Not supported
- HIX Bypass
- Not supported
- Humbot
- Not supported
Team accounts
- StealthGPT
- Supported
- Undetectable.ai
- Not supported
- HIX Bypass
- Not supported
- Humbot
- Not supported
API access
- StealthGPT
- Supported
- Undetectable.ai
- Not supported
- HIX Bypass
- Not supported
- Humbot
- Not supported
Bypass performance vs GPTZero based on StealthGPT internal testing (500 documents, August 2026) and published independent tests for other tools. Results vary by detector version, content length, and engine used. No tool guarantees 100% bypass; detector models update regularly.
See our other AI detector bypass rates
Frequently Asked Questions
Still have more questions?
Learn more in our support page.
Yes, StealthGPT has a successful bypass rate against GPTZero of 99% and registers as human written under GPTZero's perplexity and burstiness scoring. The most recent testing conducted by StealthGPT against GPTZero was in August 2026.
GPTZero is an AI detection tool developed by Edward Tian in 2023, measuring perplexity and burstiness to distinguish AI writing from human writing across submitted documents. It is one of the most widely adopted detectors in K‑12 and university settings and offers both a free tier and paid plans for bulk document scanning. GPTZero can be contrasted closely with Scribbr, which also primarily serves AI detection in academic settings.
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.
StealthGPT monitors GPTZero closely given its position as one of the most widely deployed AI detectors in education, with formal audits run at least quarterly and following any GPTZero model updates. StealthGPT uses this same tracking model against other detectors like Turnitin.
StealthGPT is tested regularly against all major AI detection platforms. Platforms like Originality.ai that typically lead in accuracy among publisher focused detectors receive special attention to ensure StealthGPT stays ahead.
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