StealthGPT
StealthGPT ranked #2 of 14 in the October 2026 cycle with an overall score of 74.50/100, after losing 3 points to penalties for meaning drift. Copyleaks passed its output most often (100.0%), and Pangram passed it least often (69.9%). It did best on news articles and worst on discussion board posts.
StealthGPT, from XYZ AI, Inc., combines an AI humanizer with an essay writer, an SEO writer and an AI detector, and has an iOS app and a Chrome extension. The humanizer offers Stealth Lite and Super rewrite modes plus tone settings from high school to Ph.D. level. No ongoing free humanizer plan is confirmed; a paid introductory trial is available.
Watch the 2-minute review of StealthGPT
- Overall score
- 74.50/100
- Detector bypass
- 88.1%
- Runner-up
- #2of 14
- Prompts tested
- 30
Detector Bypass Rates
Each detector's average human-likelihood score on this tool's outputs, where 100 means every output was scored as human.
Performance by Category
Category score across writing contexts: bypass credit only for real rewrites, blended with each category's meaning and readability. How it's computed
Strengths
- Bypass rate of 88.1%, above the field median of 71.3%
- Copyleaks classified 100.0% of its runs as human-written
- Best writing category: news articles (84.0)
Weaknesses
- Meaning preservation of 61.8, below the field median of 71.0
- Lost 3 points to penalties for meaning drift
- Weakest writing category: discussion board posts (57.2)
From the October 2026 cycle, compared with the other 13 tools ranked in that cycle.
Evidence: every run
Every prompt StealthGPT was run on in October 2026, and how each of the 6 detectors scored the output. Green: the detector called it human-written. Red: it was caught.
19 of 30 outputs passed all 6 detectors; 11 were caught by at least one.
| Prompt | GPT GPTZero | Pan Pangram | Win Winston AI | Zero ZeroGPT | Copy Copyleaks | Orig Originality.ai | Mean | Recording |
|---|---|---|---|---|---|---|---|---|
| Landing Copy · gemini-3-8-flash | passed | passed | passed | passed | passed | passed | 1.00 | |
| Product Desc · gemini-3-8-flash | passed | passed | passed | passed | passed | passed | 0.98 | |
| Landing Copy · gpt-6-sol | passed | passed | passed | passed | passed | passed | 0.95 | |
| Discussion Post · gpt-6-sol | passed | caught | passed | passed | passed | passed | 0.83 | |
| Product Desc · gpt-6-sol | passed | passed | passed | passed | passed | passed | 1.00 | |
| Lit Review · claude-sonnet-5-5 | passed | passed | passed | passed | passed | passed | 0.95 | |
| Lit Review · gpt-6-sol | passed | passed | caught | caught | passed | passed | 0.72 | |
| Cover Letter · gpt-6-sol | passed | passed | caught | passed | passed | passed | 0.80 | |
| Howto Blog · gemini-3-8-flash | passed | caught | passed | passed | passed | passed | 0.80 | |
| Lit Review · gemini-3-8-flash | passed | passed | passed | passed | passed | passed | 0.94 | |
| Landing Copy · claude-sonnet-5-5 | passed | passed | passed | passed | passed | passed | 0.98 | |
| Personal Statement · gemini-3-8-flash | passed | passed | passed | passed | passed | passed | 0.89 | |
| Argumentative Essay · gpt-6-sol | passed | passed | passed | passed | passed | passed | 0.93 | |
| Listicle Blog · gemini-3-8-flash | passed | passed | passed | passed | passed | passed | 0.96 | |
| Personal Statement · claude-sonnet-5-5 | caught | passed | passed | passed | passed | passed | 0.72 | |
| Howto Blog · gpt-6-sol | passed | passed | passed | passed | passed | passed | 0.94 | |
| Product Desc · claude-sonnet-5-5 | passed | passed | passed | passed | passed | passed | 0.93 | |
| Listicle Blog · claude-sonnet-5-5 | passed | caught | passed | passed | passed | passed | 0.82 | |
| Argumentative Essay · claude-sonnet-5-5 | passed | caught | passed | passed | passed | passed | 0.87 | |
| News Article · gpt-6-sol | passed | passed | passed | passed | passed | passed | 0.97 | |
| Howto Blog · claude-sonnet-5-5 | passed | passed | passed | passed | passed | passed | 0.90 | |
| News Article · claude-sonnet-5-5 | passed | passed | passed | passed | passed | passed | 1.00 | |
| Discussion Post · gemini-3-8-flash | passed | passed | passed | passed | passed | passed | 0.87 | |
| Discussion Post · claude-sonnet-5-5 | passed | passed | passed | passed | passed | passed | 0.93 | |
| Cover Letter · gemini-3-8-flash | passed | caught | passed | passed | passed | passed | 0.75 | |
| Listicle Blog · gpt-6-sol | passed | passed | passed | passed | passed | passed | 0.96 | |
| Cover Letter · claude-sonnet-5-5 | passed | caught | caught | passed | passed | passed | 0.58 | |
| Personal Statement · gpt-6-sol | passed | caught | passed | passed | passed | passed | 0.67 | |
| News Article · gemini-3-8-flash | passed | passed | passed | passed | passed | passed | 1.00 | |
| Argumentative Essay · gemini-3-8-flash | passed | caught | passed | passed | passed | passed | 0.78 | |
| Detector rate (mean human-likelihood) | 94.8 | 69.9 hardest | 90.4 | 77.3 | 100.0 | 96.3 | ||
| Runs passed | 29/30 | 22/30 | 27/30 | 29/30 | 30/30 | 30/30 |
A dot is green when the detector's human-likelihood score for that run was 0.50 or higher. The detector rate is the mean of that detector's scores across the runs, the same number the detector pages rank by; it is not the count of green dots, which the Runs passed row shows. Hover a dot for the score.
How to read these scores
Each detector returns a human-likelihood on a common 0 to 1 scale, where 1 means it judged the text human-written and 0 means it flagged it as AI. On these pages a verdict counts as passed when that score is at least 0.50, the midpoint of the detector's own scale. That threshold exists only to draw the chips: the bypass rate on the leaderboard is the mean of each test's scores from the 6 detectors, a continuous number, so a tool's pass count and its bypass rate will not be the same figure.
History
Overall score compared with other ranked tools.
8.5 points above the median of 13 other tools in October 2026.
The shaded band is the 25th–75th percentile of other tools in each cycle. Scores are out of 100; higher is better.
Monthly pricing
Standard USD rates, billed month to month. Annual discounts and promotions excluded.
-
Pro
$29.99/mo50,000 words per month.
- Up to 1,000 input words per use.
-
Max
$49.99/mo200,000 words per month.
- Up to 2,000 input words per use.
-
Enterprise
$179.99/mo1,000,000+ words per month.
- 10,000+ input words per use, as listed on the pricing page.
Free access and trials
No ongoing free humanizer plan is confirmed. The current introductory offer is $1 for 3 days, followed by the regular monthly Pro or Max rate.
- Optional Samurai add-ons are excluded from the base prices. The finite monthly quotas do not specify input versus output word accounting.
Sample output
One AI-written passage from the October 2026 cycle and what StealthGPT returned for it. This prompt was picked by a fixed rule, not by how the tool scored.
AI-written input
Every tool on this prompt →Personal Statement · Application Essay · written by gpt-6-sol · 357 words
I first became interested in human-computer interaction when I watched my grandfather struggle to book a medical appointment online. The website had all the information he needed, but its small text, confusing menus, and unclear error messages made a simple task feel impossible. I sat beside him and helped him finish the booking, but the experience stayed with me. Technology is often described as a way to make life easier. I want to understand why it sometimes does the opposite, and how to change that.
What draws me to human-computer interaction is its combination of technical problem-solving and attention to people. A system can be fast and reliable yet still fail if someone cannot understand or trust it. I am interested in the decisions behind that experience: how designers learn what users need, how they test assumptions, and how they balance accessibility, privacy, and simplicity. I want to study the methods that turn observations about everyday frustrations into better products.
I am especially interested in accessibility. My grandfather’s experience showed me that a design choice that seems minor to one person can determine whether another person can use a service at all. Studying human-computer interaction would help me learn to involve people with different abilities, backgrounds, and levels of digital confidence throughout the design process. I want to become better at listening before proposing solutions, and at evaluating whether those solutions work outside a classroom or lab.
I also enjoy the creative side of the field. Improving an interface means asking questions, trying ideas, and being willing to revise them when evidence challenges an initial plan. That process appeals to me because it treats mistakes as opportunities to learn rather than reasons to stop.
I hope to study human-computer interaction so I can help build technology that respects the people who rely on it. Whether I work on healthcare services, educational tools, or products I cannot yet imagine, I want to make digital experiences clearer and more inclusive. For me, success would mean someone like my grandfather could complete an important task independently, without needing to ask for help—and feel confident doing it again the next time.
Show the full input Show less
StealthGPT output
417 words (input 357)
I first became interested in human-computer interaction when I sat next to my grandfather and watched him struggle to book a medical appointment through a website. The site contained all of the necessary information, but small text, confusing drop-down menus, and unclear error messages overwhelmed him. As I sat next to my grandpa and helped him get the appointment booked, I started to think about why technology, which is meant to make everyday tasks easier, can make them harder for some people. That question sparked an interest in me to learn about how we can design technology that is effective and inclusive for everyone.
The idea of human-computer interaction appeals to me because it is a combination of technical problem-solving with an emphasis on people. A program can be efficient and reliable, but if people don’t understand it or don’t trust it, it doesn’t function well. This idea encourages us to do research to understand people’s needs and expectations, question assumptions, and think about issues of accessibility, privacy, and simplicity. Human-computer interaction provides systematic approaches for improving technology and addressing common challenges that people encounter when they interact with technology. I’m excited to learn about these approaches and think about how we can translate everyday problems into better technology.
In particular, I hope to learn about how to engage with users who have a wide range of technical abilities, knowledge, and interests throughout the process. It is important to have a mindset of humility and active listening before creating technology. Additionally, I’m interested in learning about user-centered design because it encourages us to explore how people use technology outside of lab settings, which is an important measure of a product’s success. Interface design appeals to me because it encourages us to be creative and flexible; we have to pose interesting questions, create solutions to those questions, and change our plans in light of data and results. Through this iterative design process, we learn to see failure as an opportunity to learn.
I want to study human-computer interaction because I’m eager to learn about how we can create technology that empowers and respects all of its users. I hope to apply my interest and knowledge to technology that plays an integral role in our lives such as healthcare and education or to novel technologies that have not yet reached its potential. Ultimately, I would consider my work in HCI successful if it leads to experiences where people (such as my grandpa) can perform important tasks confidently and independently.
Show the full output Show less
- GPTZero0.83passed
- Pangram0.00caught
- Winston AI1.00passed
- ZeroGPT0.53passed
- Copyleaks1.00passed
- Originality.ai0.67passed
Passed 5 of 6 detectors.
Every StealthGPT run in October 2026 →Each chip is one detector's score for that output, from 0 (AI) to 1 (human). A score of 0.50 or higher counts as a pass and shows green; below that the detector caught it and the chip shows red.
Penalties applied this cycle
How penalties work →The overall score shown above already reflects these deductions.
- Meaning drift ×3−3.0
The output's meaning drifted significantly from the original input.
Compare with
Featured in
Questions about StealthGPT
Answers are generated from the benchmark data and update every month. Last updated with the October 2026 cycle.
Is StealthGPT good?
StealthGPT ranked #2 of 14 in the October 2026 HumanizerBench cycle with an overall score of 74.50/100, above the field median of 66.78. On the parts of the score, it placed #3 of 14 on detector bypass, #11 of 14 on meaning preservation and #1 of 14 on readability. The score includes a 3-point deduction for meaning drift.
Does StealthGPT bypass AI detectors?
In the October 2026 cycle, StealthGPT had a detector bypass rate of 88.1% (#3 of 14 tools). 19 of its 30 outputs passed all 6 detectors, and 11 were caught by at least one. Its average human-likelihood score from each detector, where 100 means every output was scored as human: Copyleaks 100.0, Originality.ai 96.3, GPTZero 94.8, Winston AI 90.4, ZeroGPT 77.3 and Pangram 69.9.
Can StealthGPT bypass GPTZero?
In the October 2026 cycle, StealthGPT's average human-likelihood score from GPTZero was 94.8 out of 100 (#3 of 14 tools against GPTZero). The highest average GPTZero score that cycle was 99.5, by WriteHuman. See every tool's GPTZero results.
Is StealthGPT free?
No ongoing free humanizer plan is confirmed. The current introductory offer is $1 for 3 days, followed by the regular monthly Pro or Max rate. Paid plans start at $29.99 a month, billed monthly.
Is StealthGPT legit?
StealthGPT is a working AI humanizer at stealthgpt.ai. HumanizerBench has tested it in 5 monthly cycles, most recently October 2026, when it completed 30 of 30 test runs. Every input and output from its runs is published with each detector's verdict.
Does StealthGPT keep the original meaning?
StealthGPT scored 61.8 out of 100 for meaning preservation in the October 2026 cycle (#11 of 14; field median 71.0). The score measures how close each rewrite stays to the meaning of the original text. Its readability score was 72.6 (#1 of 14). It lost 3 points to penalties for meaning drift.
Which kinds of writing does StealthGPT handle best?
In the October 2026 cycle, StealthGPT did best on news articles (84.0/100) and worst on discussion board posts (57.2/100). On academic essays it ranked #1 of 14.
How has StealthGPT ranked over time?
StealthGPT has been ranked in 5 HumanizerBench cycles: #7 in June 2026, #8 in July 2026, #12 in August 2026, #9 in September 2026 and #2 in October 2026. Its overall score went from 71.47 in June 2026 to 74.50 in October 2026.
What are the best alternatives to StealthGPT?
In the October 2026 cycle, one tool ranked above StealthGPT: WriteHuman (#1, 74.89/100). Compare StealthGPT with any of them side by side.
Badges
StealthGPT is ranked in the October 2026 cycle, so it can embed any of these cards for free, and the live file re-renders every cycle, including when a rank falls. Usage rules →
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