AI Humanizer Benchmark
September 2026 prompts

Business email

Business email · 223 words · prompt business_email

0
passed at least 6 detectors
11
failed at least one detector
11
tools tested on this prompt
GPTZero
hardest detector, caught 11 of 11

Input passage

Generated fresh for this cycle; this exact text was pasted into every humanizer below.

**Subject: Changes to Performance Bonus Schedule – Effective [Date]** Hi Team, I'm writing to inform you of an important change to our compensation structure that takes effect [date]. We're shifting from our current quarterly performance bonus schedule to a semi-annual model. This means you'll receive performance bonuses twice yearly instead of four times per year—aligned with the end of JuneShow full input (223 words)
**Subject: Changes to Performance Bonus Schedule – Effective [Date]** Hi Team, I'm writing to inform you of an important change to our compensation structure that takes effect [date]. We're shifting from our current quarterly performance bonus schedule to a semi-annual model. This means you'll receive performance bonuses twice yearly instead of four times per year—aligned with the end of June and December. **Why this change?** After careful review, we determined that semi-annual assessments provide more meaningful data for evaluating performance. This allows us to better recognize sustained contributions, track progress on longer-term goals, and make more informed bonus decisions. It also streamlines our administrative process, allowing us to invest more resources directly into your development and compensation. **What this means for you:** - Bonus periods: January–June and July–December - Performance reviews will follow the same schedule - First semi-annual bonuses will be distributed in [month] - Your bonus amounts will be adjusted proportionally to maintain competitive total compensation **What stays the same:** All other benefits, salary, and bonus eligibility criteria remain unchanged. We continue to value your contributions and remain committed to rewarding strong performance. I recognize this is a transition, and I welcome your questions. Please reach out to [HR contact] or [manager] if you need clarification. Thank you for your continued dedication to our success. Best regards, [Your Name] [Your Title]

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. A verdict counts as passed when that score is at least 0.50, the midpoint of the scale; hover any dot for the exact value. That threshold exists only to draw the dots: the bypass rate on the leaderboard is the mean of each test's median score across the 7 detectors, a continuous number, so a tool's pass count and its bypass rate will not be the same figure. Likewise a detector-rate row is the mean of that detector's scores, the same number the detector pages rank by, not a count of green dots.

Humanized outputs

Ordered by how many detectors each rewrite passed; ties fall back to this cycle's rank. Each block shows what the tool returned and how the 7 detectors scored it.

UndetectedGPTRank #1 this cycle
4/7 detectors passed
GPTZero
0.00caught
Winston AI
0.01caught
Originality.ai
1.00passed
ZeroGPT
0.88passed
Grammarly
0.84passed
QuillBot
0.82passed
Copyleaks
0.00caught
Median
0.82
Meaning
94.8
Readability
62.0
Words
1.10× 223 → 245
Show output (245 words)
Subject: Changes to Performance Bonus Schedule – Effective [Date] Dear Team, I want to let you know of an important change to my compensation process from [date]. From now on I will move away from my existing quarterly performance bonus process to a semi-annual process. Under this new process performance bonuses will be paid twice a year (at close of June and December) replacing the current four payments. Rationale for this change: After careful consideration I believe with a semi-annual cycle I would be in a better position to produce more meaningful data against which to judge individual performance. Using this approach I could better pick up sustained contributions, track progress against longer term goals and make more informed decisions on bonus. In addition I could reduce the administrative burden allowing me to focus more of my time on employee development and compensation. Practical implications: Bonus periods will be January-June and July-December. Performance reviews will continue on same schedule. First semi-annual bonus will be paid [month]. To maintain competitive total compensation bonus will be proportionally adjusted. What remains unchanged: Other elements of your bonus (eligibility, base salary) remain unchanged. As always I value your contribution and want to reward good performance. I realize this is a significant change so if you have any questions please let me know. You can contact [HR contact] or [manager] if you would like more detail. Thanks for your ongoing contribution to my success. Best regards, [Your Name] [Your Title]
SmartHumanizerRank #2 this cycle
4/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.99passed
ZeroGPT
1.00passed
Grammarly
0.71passed
QuillBot
0.81passed
Copyleaks
0.00caught
Median
0.71
Meaning
94.9
Readability
72.0
Words
1.08× 223 → 241
Show output (241 words)
Subject: Changes to Performance Bonus Schedule – Effective [Date] Hi Team, I want to let you know of an important change to our compensation process from [date]. From now on we will move from our existing quarterly performance bonus schedule to one running twice per year. This means you will now receive performance bonuses at the end of June and December rather than four times a year. ## Why this change? After consideration we think semi-annual assessment gives more useful information on performance. This will help us pick up more clearly sustained contributions, progress against longer term goals and therefore make better decisions on bonus. It will also simplify our own administrative process meaning more of our resource can be fed into your compensation and development. ## What this means for you: - Bonus periods will be: January-June and July-December - We will continue to undertake performance reviews on the same schedule - First semi annual bonus will be paid in [month] - Your bonus will be adjusted proportionally to ensure competitive total compensation ## What stays the same: Other aspects of bonus eligibility, salary and benefits remain unchanged. As always we value your contribution and want to reward good performance. This is a change so if you have any questions please let me know or speak to your manager [manager]. You could also contact [HR contact]. Thanks for your ongoing contribution to our success. Best regards, [Your Name] [Your Title]
StealthGPTRank #7 this cycle
4/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.99passed
ZeroGPT
0.86passed
Grammarly
0.86passed
QuillBot
0.84passed
Copyleaks
0.00caught
Median
0.84
Meaning
94.0
Readability
82.0
Words
1.05× 223 → 234
Show output (234 words)
Subject: Changes to Performance Bonus Schedule – Effective [Date] Hi Team, Effective [date], we will make a change in how we calculate the performance bonus program and when it will be distributed. Why this change? In review, we determined it is more meaningful for the business to do the reviews and bonus distribution semi-annually rather than quarterly. We will be able to more accurately identify performance over a longer time horizon and assess employee contributions, performance against long term milestones, and bonus eligibility. This approach will allow us to allocate resources from conducting the reviews to better compensation and employee development opportunities. What this means for you: Performance bonuses will be paid out semi-annually (instead of quarterly). - Bonus periods will run January to June and July to December - Bonuses (and the associated performance reviews) will be distributed at the end of June and December - The first semi-annual bonus will be paid out in [month] What stays the same: All other elements of your compensation and benefits stay the same. You will still be eligible for bonuses and receive the same competitive compensation as we have scaled back the bonus amounts to account for this change. The criteria for bonuses will remain the same. If you have any questions about this change or how it will impact you please reach out to [manager] or [HR contact]. Best regards, [Your Name] [Your Title]
CleverHumanizerRank #9 this cycle
4/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.99passed
ZeroGPT
0.87passed
Grammarly
1.00passed
QuillBot
0.53passed
Copyleaks
0.00caught
Median
0.53
Meaning
91.6
Readability
62.0
Words
1.37× 223 → 306
Show output (306 words)
Subject: Changes to Performance Bonus Schedule – Effective [Date] Dear Team, I am writing to you concerning an important revision in our compensation schedule that will go into effect [date]. Effective this date, we will be changing our current pay structure in accordance with a new semi-annual performance bonus schedule. This indicates that you would be compensated with performance bonuses twice a year, at the end of June and the end of December. The reasons for this change are as follows: after careful consideration we came to the decision that semi-annual performance reviews are better suited for assessing performance, as well as allowing us to keep a closer eye on your progress, as well as making it possible to reward you for your achievements. In addition, this choice would enable us to dedicate more time and effort to actually improving your own performance and compensation, as opposed to calculating and distributing financial rewards on a quarterly basis. The following changes would apply to all employees: The performance bonus period would now be January – June and July – December. The performance reviews would take place on a similar schedule. The first round of bonuses would be distributed in [month]. You should also be aware that your performance bonus would be re-calculated in accordance with the new schedule, in order to make sure that you are rewarded with a competitive compensation package. Other than that, your other benefits, salary and bonus eligibility would remain the same. We hope that you understand that this decision was not made lightly and that we are doing this in the best interest of the company and its employees. If you have any further questions, please do not hesitate to contact [HR contact], or me personally at [manager]. Thank you for your continued dedication and support. Best regards, [Your Name] [Your Title]
WriteHumanRank #3 this cycle
3/7 detectors passed
GPTZero
0.00caught
Winston AI
0.14caught
Originality.ai
0.01caught
ZeroGPT
1.00passed
Grammarly
0.70passed
QuillBot
1.00passed
Copyleaks
0.00caught
Median
0.14
Meaning
93.5
Readability
52.0
Words
0.95× 223 → 211
Show output (211 words)
Changes to Performance Bonus Schedule – Effective [Date] Hi Team, I have some news regarding how we get paid as of [date]. If you were unaware, as of now we have a quarterly performance bonus schedule, which, as you may have guessed, means we receive performance bonuses four times a year, unlike the new system we will have moving forward. With the new system, effective this [date], we will receive performance bonuses twice a year in lieu of four, when we used to receive them quarterly. **Semi-annual assessments** We will be shifting to semi-annual assessments which will allow us more time to evaluate the performance of our employees, and more time to evaluate the goals that take more than one year to accomplish and increase the quality of the evaluations we perform on our employees; all while streamlining our administrative duties so that we can focus on your growth and compensation. **What’s in it for you:** - Performance reviews and bonuses will occur in January and July - First semi-annual bonuses will be distributed in [month] - Your total compensation will be maintained **What will not change:** Benefits along with salary structure and performance bonus criteria will all remain unchanged. Thank you for your dedication to our success. Regards, [Your Name]
GPTinfRank #4 this cycle
3/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
0.92passed
Grammarly
0.58passed
QuillBot
0.58passed
Copyleaks
0.00caught
Median
0.00
Meaning
91.6
Readability
72.0
Words
0.96× 223 → 213
Show output (213 words)
**Re: Change in Performance Bonus Schedule Effective [Date]** Dear Team, I am here to bring to your notice a significant change in our remuneration plan from [Date]. We are moving from the quarterly performance bonus system to semi-annual performance bonuses which would mean that you get your performance bonuses twice in a year, that is at the end of June and December. **Why such a change?** The company has taken this decision after much deliberation and it has been seen that the data collected through semi-annual assessment would be much more reliable and helpful in judging performances. It not only helps us in judging long-term performances but it also saves us administrative efforts enabling us to focus on other aspects like training and remuneration. **Changes in store for you:** - Performance bonus periods would be January-June and July-December - Review period for performance would be the same - Semi-annual bonuses would start being paid in [Month] - Your performance bonuses would be proportionately adjusted to ensure competitive compensation **What doesn't change?** The rest remains the same. Your salaries, other benefits and bonus eligibility conditions remain unchanged. Please let me know if you have any questions regarding the change. Thank you for your continued hard work and dedication. Warm Regards, [Your name] [Your Designation]
AI HumanizeRank #5 this cycle
3/7 detectors passed
GPTZero
0.00caught
Winston AI
0.01caught
Originality.ai
0.00caught
ZeroGPT
0.93passed
Grammarly
0.60passed
QuillBot
0.72passed
Copyleaks
0.00caught
Median
0.01
Meaning
91.3
Readability
62.0
Words
1.13× 223 → 252
Show output (252 words)
**Subject: Update on Performance Bonus Processing Schedule – Effective [Date]** Dear Team, The purpose of this note is to notify you about a significant modification in the way we process bonuses, coming into effect on [date]. We will now be adopting a model of an annual performance bonus, which means that you will receive it twice every year instead of the usual quarterly four times per year—at the end of June and on 31st December. **Why does this change take place?** After careful assessment of processes, we concluded that going semi-annually will benefit us much more when making judgements on performance. It will be allowing recognizing continued efforts, monitoring achievement of objectives set, and making more reasonable reward-related decisions. Moreover, the transition helps optimise our administrative process, and spend funds on your development rather than paper work. **What does it mean for you?** - Two bonus periods: January–June and July–December. - Performance evaluation is going to be held in the same periods. - The first performance bonuses will be paid in month [month]. - All other benefits will be kept operational, and compensation will be adjusted accordingly. **What is not going to change?** Please note that all of our objectives and eligibility criteria stay unchanged. We keep valuing your efforts and consider it necessary to recognize effective performance. I understand that this is a big transition, and I am open to your questions. You can contact either [HR manager] or [head of department] for any clarifications. Best wishes, [Your Name] [Your Position].
HIX BypassRank #6 this cycle
3/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
1.00passed
Grammarly
0.73passed
QuillBot
0.76passed
Copyleaks
0.00caught
Median
0.00
Meaning
96.4
Readability
28.0
Words
1.12× 223 → 250
Show output (250 words)
**Subject: Changes to Performance Bonus Schedule — [Date] Hi Team, I wanted to reach out and inform you that from [date], we have made a significant shift in the way our compensation is structured. Instead of rewarding quarterly performance bonuses, we're moving to a semi-annual model. This means you only get performance bonuses two times per annum instead of quarterly—at the end of June and December. **Why this change?** We considered other approaches and ultimately concluded that semi-annual assessments were more actionable in performance evaluation. By doing so, we are better able to identify sustained contributions over time, keep progress on longer-term goals on our radar and to make more informed decisions regarding bonuses. Moreover, it creates efficiencies in our administrative workflow that allows us to put more time and money directly back into your development and pay. **What this means for you:** - Bonus seasons = January–June and July–December Performance reviews will stick to the same timelines - Year then you to reveal: o Year thony Task inter-trimester in [month] Your bonuses will be scaled accordingly to ensure your total compensation remains competitive **What stays the same:** Other benefits, salary and bonus eligibility criteria remain the same. We appreciate the work you are doing and continue to reward excellent performance I know this is a transition, so feel free to ask me questions. If you need anything clarified please contact [HR contact] or [manager]. We appreciate your ongoing commitment towards helping us succeed. Best regards, [Your Name] [Your Title]
SuperHumanizerRank #8 this cycle
1/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
1.00passed
Grammarly
0.26caught
QuillBot
0.00caught
Copyleaks
0.00caught
Median
0.00
Meaning
94.4
Readability
78.0
Words
1.25× 223 → 278
Show output (278 words)
## Subject: Update to Performance Bonus Schedule - Starting [Date] ## Hi Team, I am excited to announce an upcoming adjustment to our compensation program, starting on [Date]. We are moving to a semi-annual schedule for performance bonuses. This means your bonuses will be calculated and disbursed two times annually, as opposed to the current four times annually. Your semi-annual bonuses will be distributed at the end of June and at the end of December each year. ## The reason for this change: We believe this shift to a semi-annual structure will allow for more insightful performance evaluation and bonus payouts. Semi-annual assessments provide richer data and time to recognize ongoing effort, evaluate success on long-term objectives, and make more strategic bonus allocations. Streamlining the bonus cycle also allows us to allocate more resources towards growing and rewarding you and your work directly. ## How this will work: * Bonus periods will consist of January-June and July-December. * Our formal review and feedback schedule will align with these bonus periods. * Your first semi-annual bonus under the new schedule will be paid out in [month]. * Your bonus amount will be proportional to the current amounts, to reflect a competitive overall compensation package. ## Key information that remains unchanged: Your current salary and eligibility criteria, along with all benefits, will remain the same. We are truly appreciate of your hard work and success. I am available to address all questions about this new system, and we encourage you to contact [HR Contact Name] or your direct manager at [HR Contact Info]. Thank you for your continued hard work and success. ## Best, ## [Your Name] ## [Your Title]
ReHumanizeRank #10 this cycle
1/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
0.24caught
Grammarly
0.69passed
QuillBot
0.24caught
Copyleaks
0.00caught
Median
0.00
Meaning
92.0
Readability
82.0
Words
1.12× 223 → 250
Show output (250 words)
Hi Team, I'm writing to let you know about a change in how we'll be paying out performance bonuses, starting on [Date]. We're moving from paying performance bonuses every three months to doing it twice a year. So, instead of getting a bonus four times a year, you'll get it two times a year, at the end of June and at the end of December. We decided to make this change because looking at performance over six months gives us better information. This way, we can better reward consistent work, see how people are doing on longer projects, and make fairer bonus decisions. It also makes things simpler for us administratively, which means we can put more effort into helping you grow and improving your pay. Here's what this means for you: * The bonus periods will be January to June and July to December. * Performance reviews will happen on this same schedule. * You'll get your first semi-annual bonus in [Month]. * We'll adjust the bonus amounts so that your total pay stays competitive. Everything else, like your benefits, salary, and who is eligible for a bonus, will stay the same. We still really appreciate what you do and want to keep rewarding good work. I know this is a change, and I'm happy to answer any questions you might have. Please talk to [HR contact] or [manager] if you need more information. Thanks for all your hard work that helps us succeed. Best, [Your Name] [Your Title]
Undetectable AIRank #11 this cycle
1/7 detectors passed
GPTZero
0.00caught
Winston AI
0.01caught
Originality.ai
0.00caught
ZeroGPT
0.63passed
Grammarly
0.00caught
QuillBot
0.26caught
Copyleaks
0.00caught
Median
0.00
Meaning
98.1
Readability
78.0
Words
1.30× 223 → 291
Show output (291 words)
**Subject: Changes to Performance Bonus Schedule – Effective [Date]** Hi Team, I'm writing to inform you of an important change to our compensation structure that takes effect [date]. We are making a change to our performance bonus schedule. Instead of getting a bonus every quarter, you will now get one twice a year. This means you will receive a bonus at the end of June and again at the end of December. This new semi-annual model will replace our old quarterly schedule, so you can expect to get your bonuses less often, but still at regular times throughout the year. **Why this change?** We took a close look and found that checking in on performance every six months gives us a better sense of how things are going. This way, we can see who's making a real impact over time, track progress on big goals, and make smarter decisions about bonuses. Plus, it simplifies our process, so we can put more resources into helping you grow and compensating you fairly. **What this means for you:** - Bonus periods: January–June and July–December - Performance reviews will follow the same schedule - The first semi-annual bonuses are scheduled to be paid out in [month]. - Your bonus amounts will be adjusted proportionally to maintain competitive total compensation **What stays the same:** All other benefits, salary, and bonus eligibility criteria remain unchanged. We continue to value your contributions and remain committed to rewarding strong performance. I know this is a big change, so feel free to ask me anything. If you're unsure about something, just get in touch with [HR contact] or [manager] and they'll be happy to help. Thank you for your continued dedication to our success. Best regards, [Your Name] [Your Title]

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