AI Humanizer Benchmark
September 2026 prompts

Business email

Business email · 227 words · prompt business_email

1
passed at least 6 detectors
11
failed at least one detector
11
tools tested on this prompt
Winston AI
hardest detector, caught 11 of 11

Input passage

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

Subject: Annual Offsite Date Change – Now in Early Summer Hi Team, I'm writing to share an important scheduling update. After careful consideration, we've decided to move our annual offsite from fall to early summer. This year, we're targeting late May or early June for the event. This shift offers several advantages for our team and company: **Why the change?**Show full input (227 words)
Subject: Annual Offsite Date Change – Now in Early Summer Hi Team, I'm writing to share an important scheduling update. After careful consideration, we've decided to move our annual offsite from fall to early summer. This year, we're targeting late May or early June for the event. This shift offers several advantages for our team and company: **Why the change?** Summer timing allows us to kick off the second half of the year with renewed energy and alignment. It also gives us better weather for outdoor activities and typically provides more venue availability at competitive rates. **What this means for you:** - Save the dates for late May or early June (specific dates coming soon) - Plan accordingly for any personal commitments during this window - We'll maintain the same format and duration you're familiar with **Next steps:** - Logistics and venue details will be finalized by end of month - We'll send a formal calendar invitation once confirmed - Please flag any conflicts with HR immediately This offsite remains one of our most valuable team investments. It's our chance to connect, celebrate wins, discuss strategy, and strengthen relationships across departments. I'm confident this timing will work better for everyone. If you have serious scheduling concerns, please reach out to your manager or me directly. More details coming soon. Thanks for your flexibility! Best regards, [Your Name]

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.

WriteHumanRank #3 this cycle
6/7 detectors passed
GPTZero
1.00passed
Winston AI
0.00caught
Originality.ai
1.00passed
ZeroGPT
0.90passed
Grammarly
1.00passed
QuillBot
0.89passed
Copyleaks
1.00passed
Median
1.00
Meaning
94.8
Readability
72.0
Words
1.04× 227 → 237
Show output (237 words)
Subject: Annual Offsite Date Change - Now in Early Summer Team, I have some info to share about our changes on scheduling for this year. The date for our company wide offsite has been moved to an earlier time in the summer, most likely during late May or early June. We understand this will impact vacation time, but we wanted you to know why we made this change. Most of us will be coming back from personal time off, and this gives us a chance to kick off the second half of the year with more energy and focus. It will provide us much better weather for more outdoor activities and will increase space availability and will be less expensive to book. - Offsite dates will be announced later, plan accordingly, - Save the dates with your personal schedules in mind - The offsite will follow the same format and duration Next: - Logistics will be addressed and finalized by end of this month - This will be confirmed with a calendar invitation sent to you - Schedule conflicts will need to be addressed with HR This offsite our most significant investment to bring the team together. We will celebrate the wins, reinforce the strategy, build relationships, and align. This shift will create greater balance for more of us. If you have serious concerns talk with your manager. Details to follow. Thanks for your flexibility! [Your Name]
SuperHumanizerRank #8 this cycle
5/7 detectors passed
GPTZero
1.00passed
Winston AI
0.00caught
Originality.ai
0.96passed
ZeroGPT
1.00passed
Grammarly
0.55passed
QuillBot
0.84passed
Copyleaks
0.00caught
Median
0.84
Meaning
94.5
Readability
72.0
Words
1.23× 227 → 280
Show output (280 words)
## Hi Team, I’m writing to announce a change in the timing of our annual offsite. After much discussion, we have decided to move the offsite from its traditional fall timing to early summer. Our goal this year is to host it in late May/early June. We believe this change will be beneficial in a number of ways for the team and the organization: Reasons for the move: Having the offsite in the summer, allows for a much stronger kick-off to the back-half of the year and can provide some additional energy for our teams, in a refreshed state. Additionally, our summer months can provide better opportunity to take advantage of nicer weather, for any possible outdoor sessions and often more hotel availability at favorable rates. ## What this means for you: - Block out late May or early June on your calendars (final dates will follow in short order) - Please make any personal plans with this timing in mind - We intend to retain the format and general timing you are accustomed to ## What happens next: - Logistics and venue selection will be confirmed by end of month - You will receive a calendar invite once details are locked down - All critical conflicts must be communicated to HR as soon as possible Our offsite is a high-priority investment in our teams and allows us an opportunity to connect, share successes, plan, and build our teams across functions. I am confident this new timing will benefit you all. Please communicate any serious scheduling conflicts to your manager or me as appropriate. More details to follow. Thank you for your cooperation and flexibility. ## Thanks, ## [Your Name]
UndetectedGPTRank #1 this cycle
4/7 detectors passed
GPTZero
0.99passed
Winston AI
0.00caught
Originality.ai
0.05caught
ZeroGPT
0.90passed
Grammarly
0.72passed
QuillBot
0.65passed
Copyleaks
0.00caught
Median
0.65
Meaning
95.7
Readability
72.0
Words
1.21× 227 → 274
Show output (274 words)
Subject: Annual Offsite Date Change – Now in Early Summer Dear Team, I wanted to let you know of an important change of date for our annual offsite. After much consideration I have decided to move this from fall to early summer. For this year I am looking at late May or early June as the date for the offsite. By moving to summer I believe this will bring benefits for our team and organization; we can start the second half of the year more energized and aligned on strategy. ## Why the change? More favorable weather for outdoor elements of the program. And often at this time of year I find better value for money on venues. ## What this means for you: - Please mark late May or early June on your calendar (dates will be confirmed in the next week) - Consider any personal commitments you may have over this period - As before we will follow the same format and length as last year By the end of this month I will have finalized logistics and venue. Once confirmed I will send out a formal invitation to the calendar. Please let HR straight away if you have conflicts of this date. This offsite is one of my most valuable investments in the team. It's a chance to reflect on achievements, discuss strategy, build stronger relationships across the business. ## Next steps: I believe this date will work better for all of us. If you do have significant scheduling conflict please let me or your manager know directly. More details will follow shortly. Thanks for your flexibility. Best regards, [Your Name]
StealthGPTRank #7 this cycle
4/7 detectors passed
GPTZero
1.00passed
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
1.00passed
Grammarly
0.85passed
QuillBot
0.69passed
Copyleaks
0.00caught
Median
0.69
Meaning
94.0
Readability
87.0
Words
1.15× 227 → 260
Show output (260 words)
Subject: Annual Offsite Date Change – Now in Early Summer Hi Team, I’m writing to share a small, but important change to this year’s Annual Offsite: we’ll be holding it earlier than usual, in late May or early June instead of in the fall. Why the change? Starting the second half of the year energized and aligned is ideal! Beyond the team benefits, we’re seeing better weather conditions (for outdoor activities), as well as better venue availability and pricing, by holding this year’s Offsite in the early summer months. What this means for you: - While it’s still a work in progress, we’ll be holding the Offsite in late May or early June (this will be communicated more formally once we have firm dates). We are excited to share that the rest of the Offsite will remain the same, with a similar format and duration. - While there’s flexibility, we encourage you to start planning around a potential offsite during this time, and let your manager or HR/Leadership team know as soon as you can of any conflicts that might arise so we can work together to find solutions. Next steps: We’ll be making final decisions on the Offsite venue and related logistics by the end of the month, at which time we’ll send out an invite with dates and additional details. This Offsite is a critical investment in our teams, celebrating wins, aligning on strategy, and building strong relationships between departments and across the org. Can’t wait to dive deeper into all that makes this Offsite so meaningful! Thanks!
CleverHumanizerRank #9 this cycle
4/7 detectors passed
GPTZero
0.92passed
Winston AI
0.00caught
Originality.ai
0.36caught
ZeroGPT
0.72passed
Grammarly
0.67passed
QuillBot
0.70passed
Copyleaks
0.00caught
Median
0.67
Meaning
88.2
Readability
62.0
Words
1.40× 227 → 317
Show output (317 words)
Subject: Annual Offsite Date Change – Moved to Early Summer To my dear colleagues, I hope you are all doing great. I am writing to you concerning a matter of great importance – our annual offsite event. Following deliberations, we have resolved to change the season for this gathering – henceforth, it will be held in early summer, preferably at the end of May or at the beginning of June. I believe this decision is best because it will allow you to prepare for the meeting, which will have a positive effect on our productivity for the second half of the year. Moreover, you will avoid potential problems associated with bad weather as summer air temperatures are mild. Also, we will have our choice of more venues offering favorable terms. So, first of all, you need to save the dates at the end of May or the beginning of June (the exact date will be specified shortly) and make sure you are free during this time. In addition, you should know that the format of our offsite and its duration will remain the same. Therefore, our event will help us get to know each other better and support the spirit of our team. We look forward to seeing you there! Our offsite is one of the few events that allow our team to focus on the achievements of each of our employees, discuss future prospects, and develop professional relationships. Furthermore, it is essential that we take a break from the routine to relax and share ideas with like-minded people. So, I am convinced that our decision will positively affect our productivity, which will, in turn, benefit the entire company! If you have any objections to the new date, please contact your manager or me directly. Until then, I ask you to save the date and look forward to an enjoyable and fruitful meeting! Best wishes, [Your Name]
SmartHumanizerRank #2 this cycle
3/7 detectors passed
GPTZero
0.97passed
Winston AI
0.00caught
Originality.ai
0.02caught
ZeroGPT
1.00passed
Grammarly
0.42caught
QuillBot
0.86passed
Copyleaks
0.00caught
Median
0.42
Meaning
96.9
Readability
78.0
Words
1.08× 227 → 246
Show output (246 words)
Subject: Annual Offsite Date Change – Now in Early Summer Hi Team, I wanted to let you know of an important change to our annual offsite scheduling. After much consideration we've decided to move the offsite from fall into early summer. This year we want to aim for late May or early June. There are several benefits of this for our company and team. ## Why the change? With timing in summer we can start the second half of the year more energized and aligned. More likely to get good weather for outdoor elements of the offsite. More availability of venues at good value. ## What this means for you: - late May or early June (more specific dates to follow) - allow for any personal commitments you may have in this period - we'll keep the same length and format as previous years you'll be familiar with - by end of month we'll have finalized venue and logistics - once confirmed we'll send out a calendar invite - please let HR straight away if this clashes with your own commitments This is one of our most valuable investments in our team. Through it we get to celebrate successes, talk strategy across departments, build relationships and reconnect. I think this will suit most people better. ## Next steps: If you do have significant scheduling conflicts please let me or your manager know directly. More info to follow shortly. Thanks for your flexibility! Best regards, [Your Name]
GPTinfRank #4 this cycle
3/7 detectors passed
GPTZero
0.96passed
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
0.91passed
Grammarly
0.44caught
QuillBot
0.64passed
Copyleaks
0.00caught
Median
0.44
Meaning
94.2
Readability
87.0
Words
1.14× 227 → 259
Show output (259 words)
Subject: Annual Offsite Date Change – Now Held in Early Summer Hello Team, I hope you're well. I'm reaching out regarding an update to the scheduling for our annual offsite meeting. As we discussed previously, we've made a decision to hold the event in early summer this year as opposed to holding it in the fall. There are a number of reasons why this change makes sense for the entire company. **Why the change?** Holding the offsite in the summer helps us launch into the next half of the year with increased momentum and cohesion. Additionally, it will mean better weather conditions for all of the activities we plan to hold. **What this change means for you:** - Be sure to mark your calendars for late May or early June (more details to come shortly) - Arrange any other obligations you may have around this date - Our offsite will continue to be held in the same format as usual **Next steps:** - All logistics for the offsite will be determined by the end of the month - You will receive a formal calendar invite once the details are finalized - If there are any conflicts, please bring them to the attention of HR The offsite meeting is one of the greatest investments we make in terms of team-building and development. It is an opportunity for all of us to network, have fun, and reflect on our progress throughout the year. If you have any issues with this date choice, please let me know. Thanks! More details to follow.
HIX BypassRank #6 this cycle
3/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.01caught
ZeroGPT
1.00passed
Grammarly
0.69passed
QuillBot
0.90passed
Copyleaks
0.00caught
Median
0.01
Meaning
96.7
Readability
72.0
Words
1.12× 227 → 254
Show output (254 words)
Change of date for annual offsite to early summer Hi Team, I have an important scheduling update I wanted to share. We've put a lot of thought into it and moved our annual offsite from the fall to early summer. We are aiming for late May or early June this year. There are a few benefits to this switch for our team, and company as a whole: **Why the change? *The summer timing also enables us to start the second half of the year with a refined energy and alignment. It also brings us improved weather for outdoor events and is generally a time of year with more competitive venue availability. **What this means for you:** - Late May or early June (dates tba) - If you have any commitment related to personal during this window, plan it accordingly - The same format and time as you're used to **Next steps:** - Logistics and venue information will be specified in the coming weeks - Official calendar invite will be sent upon confirmation - Any and all conflicts with HR must be flagged as soon as they occur It was one of our highest impact team investments offsite ever since. We get to socialize with each other, celebrate wins with one another, talk strategy, and build relationships across departments. I am sure that everyone will appreciate me better timing. If you are significant concerns about scheduling, please contact your manager or me directly. More details coming soon. Thanks for your flexibility! Best regards, [Your Name]
AI HumanizeRank #5 this cycle
2/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
0.93passed
Grammarly
0.37caught
QuillBot
0.70passed
Copyleaks
0.00caught
Median
0.00
Meaning
94.1
Readability
72.0
Words
1.11× 227 → 251
Show output (251 words)
Subject: Change to Offsite Date - Now Taking Place in Early Summer Dear Team, This is to inform you of a significant update on scheduling. After much thought, we have decided to move our annual offsite from the fall to early summer. We are looking forward to holding this annual offsite either in late May or early June. The positive aspects of this move are many for our organization: **What has prompted this change?** Timing during summer will enable us to start the second half of the year with increased enthusiasm. It will also provide better weather conditions for outdoor events in addition to assuring better prices for venues. **How is this likely to affect you?** - Stay tuned for the specific dates in late May/early June. - Make necessary arrangements for your personal commitments during that timeframe. - The format of the offsite will stay the same. **Next steps:** - Finalize details soon. - An invitation will be sent once everything is sorted. - Inform HR about any possible clashes as soon as possible. This offsite is one of the most significant investments we make in our team. It will give us an opportunity to meet all together, celebrate achievements, plan for the future and maintain working relationships with all departments. I am sure this date will work best for most of us. In case you have any serious concerns, please talk to either your manager or myself. More information to follow. Thank you for your understanding. Best, [Your Name]
Undetectable AIRank #11 this cycle
1/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
0.55passed
Grammarly
0.00caught
QuillBot
0.11caught
Copyleaks
0.00caught
Median
0.00
Meaning
98.7
Readability
68.0
Words
1.29× 227 → 292
Show output (292 words)
Subject: Annual Offsite Date Change – Now in Early Summer Hi Team, I'm writing to share an important scheduling update. After careful consideration, we've decided to move our annual offsite from fall to early summer. This year, we're targeting late May or early June for the event. This shift offers several advantages for our team and company: So, why the change to summer timing? Well, it's pretty simple. Summer is a great time to refresh and refocus, and it gives us a chance to start the second half of the year with a lot of energy and momentum. Plus, the weather is usually nice, which means we can do more things outside, and venues are often more available and affordable. It's a win-win, really. We can make the most of the warmer months and have some fun while we're at it. **What this means for you:** Mark your calendars for the end of May or beginning of June - we'll be sharing the exact dates soon, so stay tuned! - Plan accordingly for any personal commitments during this window We **Next steps:** We'll have all the details about where and how things will work figured out by the end of the month. We will send out a formal invite for the calendar once everything is finalized. - Please flag any conflicts with HR immediately This offsite remains one of our most valuable team investments. It's our chance to connect, celebrate wins, discuss strategy, and strengthen relationships across departments. I think this schedule will work out well for everyone. If you have any major issues with the timing, just let your manager or me know and we can figure something out. More details coming soon. Thanks for your flexibility! Best regards, [Your Name]
ReHumanizeRank #10 this cycle
0/7 detectors passed
GPTZero
0.00caught
Winston AI
0.00caught
Originality.ai
0.00caught
ZeroGPT
0.44caught
Grammarly
0.00caught
QuillBot
0.21caught
Copyleaks
0.00caught
Median
0.00
Meaning
96.2
Readability
82.0
Words
1.14× 227 → 258
Show output (258 words)
Subject: Annual Offsite Rescheduled to Early Summer Hi Team, Just wanted to let you know about a change to our annual offsite schedule. We've decided to move it from the fall to early summer this year. We're aiming for sometime in late May or early June. This change should work out well for a few reasons. Holding it in early summer means we can start the second half of the year feeling refreshed and on the same page. Plus, the weather is usually better for any outdoor activities, and we often find better venue deals during that time. What this means for you: - Please keep late May or early June in mind for the offsite. We'll confirm the exact dates soon. - Try to plan around this period for any personal commitments. - The format and length of the offsite will stay the same as you're used to. What happens next: - We'll sort out the venue and other details by the end of the month. - Once everything is confirmed, we'll send out a calendar invite. - If you foresee any major conflicts, please let HR know right away. This offsite is really important for us. It’s a good opportunity to get together, celebrate our successes, talk about our plans, and build stronger connections between teams. I believe this new timing will be more convenient for most of us. If you have any significant scheduling conflicts, please talk to your manager or me directly. We’ll share more information shortly. Thanks for being adaptable! Best, [Your Name]

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