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HumanizerBench

← September 2026 prompts

Business Email · Claude Sonnet 5

Business Email · written by Claude Sonnet 5 · 278 words · prompt business_email

1
passed at least 4 detectors
12
failed at least one detector
1
not flagged, but fewer than 5 detectors scored it
14
tools tested on this prompt
Winston AI
hardest detector, caught 12 of 13

Input passage

Generated by Claude Sonnet 5; this exact text was pasted into every humanizer below.

**Subject: Exciting Update: Expanded Parental Leave Policy** Hi Team, I'm thrilled to share some great news: starting [effective date], we're expanding our parental leave policy to **20 weeks of fully paid leave for all employees**, regardless of gender, path to parenthood, or tenure. This update reflects our commitment to supporting our team members through all of life's important milestones. Whether you're welcoming a child through birth, adoption, or surrogacy, you'll now have more time to bond with your new family member without worrying about work responsibilities or financial stress. **Key details:** - 20 weeks of fully paid leave for all parents - Available to full-time employees starting from day one of eligibility (details in the policy doc) - Leave can be taken within 12 months of the child's arrival - Flexible scheduling options are available—leave can be taken continuously or in increments, depending on your needs We believe that taking care of our team means supporting you both professionally and personally. Studies consistently show that generous parental leave leads to better outcomes for families and stronger, more loyal teams—and we want to lead by example in creating a workplace where people can thrive both at work and at home. Please take a look at the full policy details in [link/location], and don't hesitate to reach out to HR with any questions. We'll also be hosting an optional Q&A session on [date] to walk through specifics and address any concerns. Thank you for being part of a workplace that values family and well-being. I'm proud that we're able to offer this benefit, and I hope it makes a meaningful difference for you and your loved ones. Warmly, [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. 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 median score across the 5 detectors, a continuous number, so a tool's pass count and its bypass rate will not be the same figure.

A few runs come back with fewer than 5 verdicts because a detector did not return a usable score for them. A run still counts as passing at least 4 detectors only if that many detectors actually scored it and passed it. A partially scored run is counted as caught if any detector that did score it flagged the output, and is otherwise listed separately as partly scored.

Meaning is the input↔output embedding cosine and readability is a language-model writing-quality rating, both published per test in tests.json. Words is the output's length as a multiple of the input's; the scoring code penalizes ratios above 1.40 or below 0.60. Full definitions live in the methodology.

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 5 detectors scored it.

HIX Bypass

Rank #3 this cycle · run took 0:13

5/5 detectors passed
  • GPTZero0.98passed
  • Winston AI0.89passed
  • ZeroGPT1.00passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
94.2
Readability
58.0
Words
0.94× 278 → 261
Show output (261 words)

New Expanded Parental Leave Policy Announcement Hi Team, I am delighted to announce that effective [date] we will be offering a 20-week fully paid leave policy for new parents of all genders, in any path to parenthood or tenure! This enhancement is a commitment we make to honour that our teammates may want support during all life milestones. Be it welcoming a child into this world through birth, adoption or surrogacy – you'll now have time to bond with your new family member without having the nagging concern of juggling work and also worrying about finance. Key details: 20 weeks paid leave for all parents – For full-time employees, effective day 1 of eligibility (see policy doc) Leave within 12 months of the arrival of a child Leave can be taken continuously or intermittently, as your needs require. We think that supporting our team is a professional and personal thing for us. Research continually shows that substantial parental leave is a win-win for workers, families and more engaged workplace teams — we want to lead by example again here so people can thrive at work as well as home. Feel free to reach out with questions, and see the full details in [link/location]. An additional Q&A is scheduled for [date] to come in and discuss details or questions that may arise. Thank you for making a family-oriented, work / life balance workplace. I'm delighted of course that we're in a position to offer this benefit, but I hope it makes a genuine impact for you and your families. Warmly, [Your Name]

WriteHuman

Rank #1 this cycle · run took 0:15

3/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.02caught
  • ZeroGPT0.68passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
0.68
Meaning
91.8
Readability
62.0
Words
1.16× 278 → 322
Show output (322 words)

I'm so excited to say that starting [effective date], our parental leave policy will offer **20 weeks of fully paid leave** to all employees, no matter the gender of the parent or the path to parenthood. We want to be there to help our employees reach the goals that are most important to them. We know how hard it can be to welcome a new child to your family, whether it be through the birth of a child, adoption, or Surrogacy. Now, you can take the time to bond with your new family and not have to worry about your job or how you'll afford to take the time off. Here are the important details about our new policy: - All parents get 20 weeks of fully paid leave. - This leave is available to all full time employees from the first day they are able to take leave (for more info see the policy document). - This leave must be taken within 12 months of the child's arrival. - You can take this leave as one continuous period of time or take multiple shorter periods of leave, if that works better for you. We know how important it is to take care of our employees so that they can take care of themselves and so that they can be their best at work and at home. There are many benefits to taking a long parental leave and we hope that this will help our employees and improve our company. We hope you see how much this new policy will help our employees and if you have any questions please contact HR. We will be having an info session on [date] to answer any additional questions you may have. I value that this company prioritizes family and well-being. I am glad that we are able to offer this benefit and hope that it positively impacts you and your family. Regards, [Your Name]

Stealth Writer

Rank #2 this cycle · run took 0:13

3/5 detectors passed
  • GPTZero0.93passed
  • Winston AI0.00caught
  • ZeroGPT0.80passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.80
Meaning
94.8
Readability
48.0
Words
1.15× 278 → 321
Show output (321 words)

Dear Parents,Exciting news! - An expanded Parental Leave policy. Hi Team, This is exciting news to share that we are launching a new parental leave policy for all employees from [effective date] onwards that provides for 20 weeks fully paid leave based on any reason for becoming a parent, irrespective of gender or path to parenthood or length of service. This is a reflection of our desire to accompany our staff members as they go through the various important moments of their lives. Whether you're welcoming a child through birth, adoption, or surrogacy, you'll now have more time to bond with your new family member without worrying about work responsibilities or financial stress. **Key details:** Fully paid leave for all parents for 20 weeks.20 weeks fully paid leave for all parents. - Open to all full-time staff on day one of eligibility (see policy document) Leave can be used within 12 months of the child's enrolment. Flexible arrangements for leave – leave can be taken in increments or in continuous blocks as needed - We feel our commitment to the best of care for our team is to support you both professionally and personally. It's a proven fact that giving parents generous leave results in improved family outcomes and more loyal and productive teams, and we want to set the example to make our workplace a place where people can do well at work, as well as at home. Take a moment to review the full details of the policy in [link/location] and feel free to contact HR with any questions. There will also be an optional Q&A on [date] to discuss specific details and alleviate any concerns. Thank you for your support in a workplace that cares for families and wellness. I am pleased that we can be able to provide this benefit and I hope that it is a positive one for you and your family. Warmly, [Your Name]

Undetectable.ai

Rank #6 this cycle · run took 0:15

3/5 detectors passed
  • GPTZero0.57passed
  • Winston AI0.00caught
  • ZeroGPT0.86passed
  • Copyleaks0.00caught
  • Originality.ai0.92passed
Median
0.57
Meaning
96.6
Readability
48.0
Words
0.97× 278 → 270
Show output (270 words)

**Subject: Exciting Update: Expanded Parental Leave Policy** Hi Team, Here is the beginning of your email. The new 20 week parental leave policy now begins to be put into practice on [effective date]. We’re a family-friendly workplace, and we support our employees through all of life’s big milestones. Whether you’ve had a baby, adopted, or had a child through surrogacy, we want you to have the time and resources to spend precious time with your new family member. **Key details:** - 20 weeks of fully paid leave for all parents - Eligible full-time employees can start taking leave from day one of eligibility (as outlined in the full policy document). íně** - Leave can be taken within 12 months of the child’s arrival. - Leave may be taken continuously or in increments as needed to support employees’ needs during this time. By supporting our employees and their families, we support our team and our work. By providing generous parental leave, we are creating a workplace that is a great place to work and be while also helping families to be at their best. The full policy can be found here: [link/location]. I have included all of the important details for you, but if you have further questions or just want to review with HR, we will be holding an optional Q&A on [date]. Thank you for being part of a workplace that values families and their health and wellbeing. I am also very grateful that we are able to offer this to our employees and I hope it makes a difference for you and your loved ones. Warmly, [Your Name]

StealthBypass

Rank #13 this cycle · run took 0:19

3/3 detectors passed
  • GPTZero0.98passed
  • ZeroGPT1.00passed
  • Originality.ai0.98passed

2 of the 5 detectors returned no usable verdict for this run, so its pass count is out of 3, not 5.

Median
0.98
Meaning
77.9
Readability
58.0
Words
0.03× 278 → 9

Output is less than 0.6× the input length, penalized as length deflation (truncated).

Show output (9 words)

**Subject: Fantastic news: We're expanding our parental leave benefits!**

AI Humanize io

Rank #4 this cycle · run took 0:20

2/5 detectors passed
  • GPTZero1.00passed
  • Winston AI0.00caught
  • ZeroGPT0.42caught
  • Copyleaks0.00caught
  • Originality.ai0.94passed
Median
0.42
Meaning
93.3
Readability
68.0
Words
1.03× 278 → 285
Show output (285 words)

**Subject: Exciting news! Expanded parental leave policy.** Hello Team, I am happy to announce some wonderful news about the expansion of our parental leave policy! As of [effective date], we will now provide **20 weeks of fully paid parental leave for all employees**, regardless of gender, path to parenthood, or tenure. The expansion of our parental leave policy is an important step towards our commitment to help our team members meet various milestones in their lives. You can now spend more time with your newborn child without concerns about job responsibilities and financial constraints. **The key points are:** - 20 weeks of fully paid parental leave for both parents. - The parental leave policy applies to all full-time employees from the beginning. - You can avail the paid leave during the first 12 months after the birth of your child. - You can choose to take leave in chunks or continuously. At our organization, we believe that taking care of our team means supporting in all the ways possible—professionally as well as personally. Research supports the concept of parental leave—it ensures good outcomes for families and fosters greater loyalty and teamwork. We would like to set an example here by promoting a culture in our workplace that helps people live better both personally and professionally. Please read the complete parental leave policy [link/location] and let us know if you have any questions. We are hosting an optional Q&A session on [date] to revisit the details associated with the policy and clarify any doubts that you may have. Thank you for being associated with an organization that values the importance of family and well-being. I hope this will help make a positive difference in your life!

Humanize AI Pro

Rank #7 this cycle · run took 0:13

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.92passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.00
Meaning
91.8
Readability
58.0
Words
1.03× 278 → 286
Show output (286 words)

**Subject: Great News: New Parental Leave Policy** Hi Team, I am pleased to announce a great change that will come into effect on [effective date] – an updated parental leave policy which will include **up to 20 weeks of fully-paid leave for all parents, no matter their gender and way to get children**. This change shows how committed we are to supporting all of our team members' achievements and life stages. If you are having or adopting a baby or using surrogate motherhood services, you will get more time to bond with your child and not worry about any job and financial obligations anymore. **Here are the details:** - 20 weeks of fully-paid leave for all parents; - Available to all full-time employees from the first day of eligibility (for the full information check the policy document); - Eligible for use in 12 months after the birth of a child; - Can be used continuously or in parts, depending on the employee's preferences; We value our employees and know that good treatment at work will result in better results of our teamwork. Numerous studies prove that a generous parental leave policy results in better life conditions for families and higher loyalty from the team members to the company. So, we will do everything to give a good example in that respect. For more detailed information about the new policy, please check [location/link]. You can contact the HR department with any questions you may have. In addition, we are planning to hold a Q&A meeting on [date]. Thank you for working in the company where family is valued. I am glad that we are able to provide our team members with this benefit. Best regards, [Your Name]

Phrasly

Rank #8 this cycle · run took 0:23

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.01caught
  • ZeroGPT0.78passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.01
Meaning
93.9
Readability
68.0
Words
1.08× 278 → 300
Show output (300 words)

Subject: Parental Leave Policy Updated Good news! Our parental leave policy has been updated to 20 weeks of fully paid leave **for all employees**. This began on [date] and applies to all genders, ways of building your family, and regardless of how long you've been with the company. We understand that life happens and we want to do our part to allow you to take care of what matters most. Whether you're planning on starting a family or expecting unexpectedly, you'll now have more time to spend with your newborn child(ren) without the stress of work or lost wages. This applies to childbirth, adoption, surrogacy, etc. The highlights are as follows: - 20 weeks paid leave for all parents -Allowable for full-time employees only (but begins on day one of eligibility)! See policy document for eligibility definition. -Can be taken within 12 months of child arrival. -Allow flexible schedules. You can take the 20 weeks all at once or split it up into chunks that work for you. Research shows that when companies offer adequate parental leave, employees have more successful experiences bringing new life into their families. Additionally, they are more likely to remain with a company that supports them both professionally and personally. We want to continue to set the standard for building a kick-ass team that has a workplace where you can enjoy spending your time both at the office and at home. You can find the full policy update at [link/located in policy handbook]. If you have any questions, please feel free to contact HR. We will be hosting an optional meeting with Q&A on [date] to go over the nitty gritty. Thank you for being a part of a company that values your family. I'm excited we can provide this for you. Best, [Your Name]

StealthGPT

Rank #9 this cycle · run took 1:24

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.69passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.00
Meaning
96.1
Readability
48.0
Words
0.97× 278 → 270
Show output (270 words)

Subject: Exciting Update: Expanded Parental Leave Policy Hi Team, Starting on [effective date], we will be offering the best parental leave in the industry: "20 weeks of fully paid leave for all employees", no matter gender, tenure, or how they're becoming parents, including via birth, adoption and surrogacy. We understand that balancing your responsibilities at work with your commitment to your family can be challenging. We want to support our employees in this journey so that you can focus on what matters most. All employees, full-time from day one (see Policy document for more eligibility details) Anytime in the 12 months after the addition of the child Flexibly scheduled, in one chunk or in parts All employees are eligible and we're happy to announce that we are offering one of the best parental leaves in the industry. Studies consistently show that generous parental leave policies help families and strengthen loyalty to the company. For more details about the policy please see [link/location] We are very excited and proud of this new policy. I'm planning to send out a link for an optional Q&A in which we will answer any questions. [date]. If you have any questions please contact the HR department and we are happy to answer them. Our team is lucky enough to have great support for each other, not just in professional achievements, but also in personal ones. Growing your family is a huge accomplishment and we want to continue to celebrate those wins and support our employees. Thanks for all of your hard work and I'm looking forward to continuing to work with you all. [Your Name]

SupWriter

Rank #5 this cycle · run took 0:16

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.01caught
  • ZeroGPT0.90passed
  • Copyleaks0.00caught
  • Originality.ai0.02caught
Median
0.01
Meaning
95.2
Readability
58.0
Words
1.01× 278 → 280
Show output (280 words)

**Great News: Enhanced Parental Leave Policy** Hello Team, We are excited to announce that starting [effective date], our parental leave policy will expand to 20 weeks of fully paid leave for all employees, regardless of gender, path to parenthood, or length of service. This update states our commitment to being there for our team members through all the milestones of life. If you are bringing your child through birth, adoption or surrogacy, you will now have more time and freedom from work or funding obligations to spend with your newborn. **Important information** - All parents will be given 20 weeks of fully paid leave. - Full-time employees have access (as per policy doc) to a policy from day one of eligibility. - Leave may be taken within 1 year of the child’s arrival. - Leave can be taken in one go or in pieces with a flexible schedule option. We feel responsible for the professional and personal support of our people. Research consistently indicates that generous parental leave results in improved family outcomes as well as stronger, more loyal teams. This is what we wish to evidence, as we want to create a workplace where people can thrive at work and at home. Check out the full policy details in [link/location] and feel free to contact HR with any questions you may have. We will conduct a voluntary Q&A session on [date] to take you through particulars and answer any queries. We appreciate your contribution toward creating a family-friendly workplace that cares for employees. I’m glad we’re able to offer this benefit and I really hope it makes a difference for you and your family. With warm regards, [Your Name].

Walter Writes

Rank #10 this cycle · run took 0:30

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.50passed
  • Copyleaks0.00caught
  • Originality.ai0.03caught
Median
0.00
Meaning
95.4
Readability
76.0
Words
1.39× 278 → 386
Show output (386 words)

**Subject: Important Update to Our Parental Leave Policy** Hello Team, I am excited to pass along some very positive information. Beginning [the effective date] we will expand our current parental leave policy to provide **fully paid leave for twenty weeks to all employees**; this includes leave based upon birth, adoption, surrogacy or other methods of becoming a parent. The updated policy reflects our continued commitment to providing support to our employees during those significant events in their lives. All of our employees, including but not limited to mothers, fathers, adoptive parents and surrogate parents will receive more than enough time to spend bonding with their children while minimizing financial stress and professional obligations. **Summary Information:** - Twenty weeks of fully paid parental leave. - This leave is provided to all full-time employees commencing on the first eligible day after the employee has completed their probationary period (See policy document). - Employees may choose to take their leave at any time during the twelve-months following the child's birth or placement. - Flexible scheduling is allowed. Employees may elect to take continuous leave or may take leave in increments as they deem necessary. By offering employees additional flexibility and support in balancing their personal and professional lives, we intend to demonstrate our dedication to caring for each and every employee. Studies have repeatedly shown that generous parental leave policies result in improved family outcomes, increased loyalty and retention among employees, and ultimately create a healthier and more productive workforce. We seek to establish ourselves as a model employer that allows its employees to flourish in both their professional careers and personal lives. If you would like to review the complete details regarding the expanded policy please click on the link located at [insert location]. If you should have any questions regarding this matter, please do not hesitate to contact the Human Resource Department. In addition, we will be conducting an optional Q & A session on [insert date] at which time we will be reviewing all aspects of the new policy and addressing any specific concerns you may have. Thank you for your ongoing contributions to our company. I am grateful that we are able to extend these benefits to our employees and I trust that this will positively impact you and your family. Best regards, [Your Name]

Grammarly

Rank #12 this cycle · run took 0:12

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.53passed
  • Copyleaks0.00caught
  • Originality.ai0.06caught
Median
0.00
Meaning
97.3
Readability
68.0
Words
1.11× 278 → 309
Show output (309 words)

**Subject: Exciting Update: Expanded Parental Leave Policy** Hi Team, I'm very excited to announce some excellent news: from [effective date] on, we are introducing an expanded parental leave policy which will provide all employees with **20 weeks of fully paid leave**, no matter their gender, route to parenthood, or length of service. This update shows our dedication to helping our team members through all of the important events in their lives. If you're having a child through birth, adoption, or surrogacy, you'll now have more time to get bonded with your new family member without having to worry about your work duties or financial problems. **Key details:** - 20 weeks of fully paid leave for all parents - Available to full-time employees starting from day one of eligibility (details in the policy doc) - Leave can be taken within 12 months of the child's arrival - Flexible scheduling options are available—leave can be taken continuously or in increments, depending on your needs We believe that looking after our team involves supporting you in both a professional and a personal sense. It has consistently been shown by studies that ample parental leave results in better outcomes for families and in stronger, more loyal teams—and therefore we wish to set an example by building a working environment in which people can succeed both at work and at home. For more details on the policy see [link/location], and if you have any questions feel free to contact HR. We'll also have an optional Q&A session on [date] when we'll go over the details and answer any concerns you may have. Thanks for taking part in a work environment that places a value on family and well-being. I'm pleased that we're able to provide this benefit, and I hope it will make a real difference to you and your family. Warmly, [Your Name]

Penlify

Rank #14 this cycle · run took 0:26

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.01caught
  • ZeroGPT0.88passed
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
94.8
Readability
78.0
Words
0.75× 278 → 209
Show output (209 words)

Subject: Exciting Update: Expanded Parental Leave Policy Hi Team, Got some news that'll make a lot of us smile: starting [effective date] we're bumping the parental‑leave benefit up to 20 weeks of full pay. No matter how you become a parent, birth, adoption, surrogacy, or how long you've been with us, you'll get the same stretch. From day one of eligibility, any full‑time teammate can tap into the leave, and you've got a whole year after the baby arrives to use it. Want the whole block back‑to‑back? Go for it. Prefer to split it up around a project or a school year? That works too, just let HR know what fits your schedule. Why the change? Folks who get this kind of time tend to feel less rushed, and teams end up tighter and more loyal. We're hoping the extra weeks help you focus on the little moments at home without the usual work‑money worries. Take a look at the full policy here: [link/location]. Any questions, ping HR. We'll also run a casual Q&A on [date] for anyone who wants the rundown or has specific concerns. Thanks for being part of a place that actually values family. Proud to roll this out for you and yours. Warmly, [Your Name]

Super Humanizer

Rank #11 this cycle · run took 0:10

0/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.47caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
94.7
Readability
84.0
Words
1.31× 278 → 365
Show output (365 words)

Subject: Big news! A more inclusive parental leave policy for our team Hey team, I am absolutely thrilled to announce an exciting update we'll be rolling out for our parental leave policy, effective [effective date]. Moving forward, all employees will be eligible for 20 weeks of fully paid leave regardless of your gender, how you became a parent, or how long you've been with us. This enhancement of our policy is driven by our commitment to being a truly supportive workplace, recognizing and celebrating all of life's significant moments. Whether you are welcoming a child through birth, adoption, or surrogacy, this policy ensures you will have more time to focus on building precious bonds with your new family member without the added worry of career interruption or financial strain. Here's what you can expect: - All parents, in every family structure, will now receive 20 weeks of fully paid parental leave. - This applies to all full-time employees, from day one of eligibility (a full breakdown of the requirements is available within the policy document). - You will have up to 12 months from the date of your child's arrival to use this leave. - The leave can be taken all at once or in smaller segments, depending on your and your family's needs and preferences-talk to your manager about how to schedule. We believe in fostering a culture that supports you, both in and out of the workplace. Research repeatedly demonstrates that substantial parental leave benefits families and creates more dedicated and resilient teams. We are eager to set a new benchmark and truly embrace the idea of people excelling both personally and professionally. Kindly review the detailed policy [link/location]. Please don't hesitate to reach out to HR if you have any questions. We will also be holding a voluntary Q&A session on [date] to discuss all the new details. Thank you for being a part of a company that prioritizes the well-being of its employees and their families. I am very happy that we are in a position to implement this benefit and believe it will make a positive and impactful difference for many of you and your loved ones. Sincerely, [Your Name]

Session recording