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The September 2026 results are in: WriteHuman holds #1, and newcomer SupWriter debuts at #5.Read the full analysis →
HumanizerBench

← September 2026 prompts

Business Email · GPT-5.5

Business Email · written by GPT-5.5 · 248 words · prompt business_email

1
passed at least 4 detectors
14
failed at least one detector
14
tools tested on this prompt
GPTZero
hardest detector, caught 13 of 14

Input passage

Generated by GPT-5.5; this exact text was pasted into every humanizer below.

Subject: Expanding Paid Parental Leave to 20 Weeks Hi team, I’m pleased to share an important update to our benefits program: effective immediately, we are expanding paid parental leave to 20 weeks for all employees. This enhanced leave applies to all eligible parents, including birthing, non-birthing, adoptive, foster, and surrogate parents. Our goal is to support employees in taking the time they need to care for and bond with a new child, manage family transitions, and return to work feeling supported. We know that welcoming a child is a major life event, and every family’s path looks different. Expanding parental leave is one way we can better reflect our commitment to employee well-being, equity, and a workplace culture where people are supported both professionally and personally. Employees who are currently on parental leave, have an upcoming leave planned, or have questions about eligibility and timing should contact HR for guidance. HR will also share updated policy details, including how to request leave, required documentation, pay continuation, and coordination with any applicable local, state, or national leave programs. Managers should work closely with team members and HR to plan coverage, support smooth transitions, and ensure employees can fully disconnect during their leave. Thank you for everything you do to make our workplace supportive and inclusive. We’re proud to take this step forward and will continue looking for ways to strengthen the benefits and resources available to our team. Please reach out to HR with any questions. Best, [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.

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.

WriteHuman

Rank #1 this cycle · run took 0:25

4/5 detectors passed
  • GPTZero0.95passed
  • Winston AI0.91passed
  • ZeroGPT0.82passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.91
Meaning
87.5
Readability
55.0
Words
0.92× 248 → 229
Show output (229 words)

I’m excited to announce that our benefits program has made an important update. As of now, all employees will have 20 weeks of paid parental leave. The leave will be given to all parents who are birthing parents, non-birthing parents, adoptive parents, foster parents, and parents through surrogacy. We will support our employees in taking the time to bond with their child and to help their family adjust to the new situation. We understand that every family is different and that there are different ways to welcome a child. To better support our employees, we have updated our parental leave to better reflect our commitment to our employees' overall well-being. Employees that are on parental leave, have parental leave scheduled, or have concerns should reach out to HR. HR will be able to answer any concerns and will be able to give more information on our new policies. They will be able to help employees with leave requests, employed documentation, and leave coordination with other leave programs. It is important that managers work with HR to help plan coverage and transitions for employees who will be leaving. This will help employees take full leave and be able to disconnect. We believe that our new update will help our employees feel more supported and include more resources for our employees. If you have any questions please reach out to HR.

Stealth Writer

Rank #2 this cycle · run took 0:08

3/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.37caught
  • ZeroGPT0.84passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
0.84
Meaning
83.8
Readability
35.0
Words
1.19× 248 → 294
Show output (294 words)

The graduate offers additional to the standard 20-week leave.The graduate is an extra leave on top of the 20-week leave. Hi team, It's with great joy that I can pass on an important change to our benefits program: from now on, all staff members will have 20 weeks of paid parental leave. This additional leave is available to all eligible parents, including those who are not the biological mother, father or child, such as adoptive, foster and surrogate parents. To help staff find the time to care for and connect with a new baby, assist with transitions and help staff feel supported as they return to work. We recognise that bringing up a child is a significant life change and each family is unique. We need to do more to show our commitment to employee well-being, equity and a workplace culture that supports employees as well as their professional growth and development by expanding parental leave. Staff who are currently on parental leave, are in the process of arranging a future leave or have queries about applying for/when they can take a parental leave should check with HR. HR will also provide up-to-date information regarding the policy, such as how to apply for leave, the documentation needed, payment during leave and leave coordination with local, state and national leave policies, if applicable. Managers should liaise closely with team members and HR to arrange cover, help ensure seamless transitions, and make sure that staff can truly 'unplug' while on leave. Thanks for your efforts in promoting a supportive and inclusive workplace. We are pleased to take this positive step and will always strive to enhance the benefits and support that are available for our staff. Contact HR if you have any questions. Best, [Your Name]

HIX Bypass

Rank #3 this cycle · run took 0:51

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.03caught
  • ZeroGPT0.90passed
  • Copyleaks0.00caught
  • Originality.ai0.99passed
Median
0.03
Meaning
96.3
Readability
48.0
Words
1.09× 248 → 271
Show output (271 words)

Dear _, Expand Paid Parental Leave to 20 weeks! Hi team, I am delighted to announce a key update of our benefits program: we are extending paid parental leave to 20 weeks for all employees, effective immediately. This extended leave is available to all qualifying parents: birthing, non-birthing, adoptive, foster and surrogate. We want to help our employees take the time they need with a new child, through family changes and transition back into work while feeling supported. We recognize that bringing a child into the world is one of life’s great turning points, and no journey to parenthood looks alike. Increasing the paid parental leave is one way to more fully embrace our ideals as a company that cares about employees, equity, and work-life balance. HR can clarify your options if you're a parent on parental leave, schedule to go or want answers about eligibility and timing. HR plans to communicate specific employee leave requests in the coming days, including how and when employees can request leave, the documents required for requesting these leaves (if any), what happens with pay if an employee is using this policy or whether local/state/national programs are expected to supplement them. To ensure that coverage is planned, transitions go smoothly and employees are able to make a complete detachment from work during their leave, managers need to collaborate with team members as well as HR. We appreciate everything you do to create an environment that is caring and open. We’re excited about this move forward and will keep exploring more ways to enhance our employee value proposition. Any questions, please contact Hr. Best, [Your Name]

AI Humanize io

Rank #4 this cycle · run took 0:16

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.73passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.00
Meaning
94.5
Readability
62.0
Words
1.06× 248 → 262
Show output (262 words)

Subject: Paid Parental Leave to be expanded to 20 weeks Dear all, I'm excited to announce an important change to our benefits program. We are expanding our paid parental leave to an incredible 20 weeks effective immediately for all our eligible employees! This new policy affects all parents no matter how they receive their child; whether through birthing, adoption, fostering, or as a surrogate. It is our hope this change encourages parents to take time off to bond and care for a new child and take care of family matters. We understand that every new child in every family's life is such a big event so each family may experience this differently. By expanding parental leave we are ensuring that we can reflect our dedication to the well-being of our employees and that they are supported at work and in their personal lives. Employees who are currently enjoying parental leave, who are going to be on parental leave soon, or who are unsure of their eligibility should reach out to Human Resources. HR will be able to provide details of the policy and how employees can go about requesting parental leave, required documents, and payment. All managers are encourage to work with individual employees and with HR to prepare coverage during their absences and the transition process before they leave. We know that all of you will continue to do great work to make our workplace a more supportive and inclusive one. Thank you for being a big part of this organization, and we look forward to future developments. Best, [Your name]

Undetectable.ai

Rank #6 this cycle · run took 0:18

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.02caught
  • ZeroGPT0.78passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.02
Meaning
97.2
Readability
62.0
Words
1.08× 248 → 269
Show output (269 words)

Subject: Expanding Paid Parental Leave to 20 Weeks Hi team, I want to share some great news regarding benefits. As of today all parents, birthing, non-birthing, adoptive, foster, and surrogate, will receive 20 weeks of paid parental leave. This new leave will be granted to all eligible parents for birthing, non-birthing, adoption, foster care or surrogacy. The leave is intended to enable employees to have the time and space to care for a new child, to deal with family changes and to return to work feeling supported. Welcoming a new child (biologically, adoptively, by foster care, or as a surrogate) can be a major life event and take many different forms. We are attempting to reflect our commitment to supporting the well-being and work of employees through our expanded parental leave policy. Employees currently on parental leave, with future leave planned, or who have questions regarding eligibility for parental leave and associated timing, should contact HR. The updated policy will also be provided to employees outlining details regarding a request for leave, documentation required, pay during leave, and where applicable, co-ordination with other local, state or national leave programs. Managers will need to work with employees and HR to make sure the employee’s work is covered while they are on leave and there are no unexpected work related issues that need to be dealt with while they are trying to disconnect from work. Thanks for all your efforts in making this wonderful workplace what it is. We will keep exploring more benefits and resources to support our employees. Please reach out to HR with any questions. Best, [Your Name]

Humanize AI Pro

Rank #7 this cycle · run took 0:24

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.69passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.00
Meaning
91.3
Readability
74.0
Words
1.06× 248 → 264
Show output (264 words)

Topic: Extension of Paid Parental Leave to 20 Weeks Team, I am excited to announce an enhancement to our benefit package; with immediate effect, all our employees will now get paid parental leave of up to 20 weeks. The new benefit is offered to all eligible parents, irrespective of whether one is the birthing parent, non-birthing parent, adoptive parent, foster parent, or surrogate parent. The purpose of increasing the number of weeks of paid parental leave is to give employees adequate time to take care of their newborns, transition into parenthood smoothly, and return to work with a sense of support. Becoming a parent is one of the most defining events in an individual's life; every family's story is unique. As a company, extending parental leave is just another step in acknowledging our dedication to supporting employee wellness and equity in our organization. All employees on leave currently, planning to take the parental leave soon, and having queries about their eligibility and when they can take the leave should contact HR. HR will provide detailed policies regarding this new enhancement, such as requesting parental leave, mandatory documentation, pay continuation, and coordination with any applicable local, state, and federal programs for parental leave. As managers, your role is to coordinate closely with your team members and HR to plan adequately for your team and provide smooth transition for employees going for parental leave. Thank you for everything you do to make our workplace an inclusive and welcoming place. It gives us great pleasure to make this enhancement in our benefit package. Kind regards, [Your Name]

Walter Writes

Rank #10 this cycle · run took 0:31

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.89passed
  • Copyleaks0.00caught
  • Originality.ai1.00passed
Median
0.00
Meaning
92.3
Readability
72.0
Words
1.19× 248 → 294
Show output (294 words)

Subject: expanded paid parental leave to 20 weeks Hello team, I am writing to announce another expansion of our company's benefit package. Effective today, we are adding additional paid parental leave to our company-wide benefits. All employees (birth parent, non-birth parent, adoptive, foster, surrogate) are now eligible for 20 weeks of paid leave when they welcome a new baby or begin caring for children through adoption or surrogacy. Our company believes that all families deserve the time needed to transition into parenting and develop their relationship with their child. Therefore, we are committed to supporting all eligible parents and families as they navigate these significant life events by providing a comprehensive paid leave program that supports them both professionally and personally. All employees currently on parental leave; those planning to be on parental leave; and/or all employees needing information regarding the expanded paid parental leave eligibility and process should contact HR directly. In addition, HR will provide further details of the updated policies (including procedures for requesting parental leave, documentation requirements, continued payment while on leave, and the coordination of any state, federal, or local leaves), which may apply. Additionally, managers should assist your teams in coordinating staffing needs, facilitate seamless transitions within the team while employees are on leave and ensure that employees have the opportunity to completely disconnect from work-related responsibilities while they are on leave. Thank you again for all that you do to create a work environment that is both supportive and inclusive of all employees. We are excited to take this next step and look forward to continuing to identify opportunities to enhance the benefits and resources provided to all team members. If you have any questions, please do not hesitate to contact us at HR. Sincerely, [your name]

SupWriter

Rank #5 this cycle · run took 0:14

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.62passed
  • Copyleaks0.00caught
  • Originality.ai0.29caught
Median
0.00
Meaning
94.2
Readability
57.0
Words
1.04× 248 → 258
Show output (258 words)

Subject: Increase in Paid Maternal Leave to Twenty Week Hello Team I am happy to announce that paid parental leave has been expanded to 20 weeks for everyone, as effective immediately through the benefits update. All eligible parents, including birth, non-birthing, adoptive, foster, and surrogate parents, are entitled to this enhanced leave. We aim to assist employees in taking the time off needed to care for and bond with a new child, navigate life changes and come back to work supported. We understand that every family’s journey is unique and welcoming a child is a life-changing event. The expansion of parental leave is one of the ways we can better embody our commitment to the well-being of employees, equity, and a workplace culture in which people feel supported at work and at home. HR encourages any employees who are currently (or about to take) parental leave or who have questions about eligibility and timing to get in touch. Human Resources will also share the revised policy details such as how to request leave, the documentation needed, pay continuation, and coordination with any applicable local, state or federal leave programs. It is necessary for the managers to work with HR and their teams to plan the coverage and smooth transitions, so employees can disconnect fully. Thanks for everything you do to foster a supportive and inclusive workplace. To enhance our employee benefits and resources we have taken this step and will keep in mind to do so going forward. Contact HR if you have any questions. Best, [Your Name]

StealthGPT

Rank #9 this cycle · run took 1:17

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.56passed
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
95.6
Readability
80.0
Words
0.96× 248 → 237
Show output (237 words)

Subject: Expanding Paid Parental Leave to 20 Weeks Hi Everyone, Today we are excited to announce we are expanding paid parental leave for birthing, non-birthing, adoptive, foster, and surrogate parents to 20 weeks, effective immediately. This expansion reflects our commitment to support all employees in welcoming a new child into the family, allowing time for bonding and care, and to help ensure a smooth transition into the family’s new everyday. For eligible employees already on leave or who are planning an upcoming leave, please contact HR for more details about the policy update, including the process to request the leave, the documentation you may need to provide, and how your pay is continued during the leave. HR can also help answer any questions about how this policy interacts with local, state, or national statutory leave programs. Managers will continue to work with team members to ensure we have adequate coverage and a successful transition plan before a team member begins their parental leave so everyone can leave the work world behind and enjoy time with their child and family. This next step in our parental leave policy provides greater support for new parents and reinforces the value our company places on the personal lives of our employees, in addition to their important contributions to our team. We look forward to continuing our work toward equity, inclusivity, and a workplace that supports the needs of all employees. Best,

Grammarly

Rank #12 this cycle · run took 0:11

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.34caught
  • Copyleaks0.00caught
  • Originality.ai0.98passed
Median
0.00
Meaning
97.6
Readability
75.0
Words
1.28× 248 → 317
Show output (317 words)

Subject: Expanding Paid Parental Leave to 20 Weeks Hi team, I would like to provide an important update regarding our benefits program: from now on, paid parental leave is being increased to 20 weeks for all employees. The improved leave will be available to all eligible parents, whether or not they are the ones giving birth, including birthing parents, non-birthing parents, adoptive parents, foster parents, and surrogate parents. The aim is to help employees take the time they need to look after and form a bond with a new child, handle the changes in their family, and return to work with a sense of support. It is clear that having a child is a significant event in a person's life, and each family's experience is different. One way of showing our commitment to employees' well-being, fairness, and creating a workplace culture in which people are supported both in their professional and personal lives is to extend parental leave. Any employees who are on parental leave at the moment, who have parental leave scheduled in the future, or who have questions regarding eligibility and the timing should get in touch with HR for advice. Additionally, HR will provide information on the updated policy, covering how to request leave, the documentation required, the arrangement for continued pay, and how to co-ordinate with any relevant local, state, or national leave schemes. Managers ought to work closely with their team members and with HR in order to arrange coverage, assist with smooth transitions, and make sure that employees are able to completely disconnect when on leave. We thank you for all that you do to make our workplace a supportive and inclusive one. We are proud of having taken this step and will keep on seeking ways to improve the benefits and resources available to our team. If you have any questions, please get in touch with HR. Best, [Your Name]

Penlify

Rank #14 this cycle · run took 0:35

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.77passed
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
90.4
Readability
80.0
Words
0.88× 248 → 217
Show output (217 words)

Hey team, Starting today we're bumping paid parental leave up to 20 weeks for everyone on the roster. No extra paperwork to qualify, if you're a birthing, non‑birthing, adoptive, foster or surrogate parent, the extra time's yours. We figured a longer break would give folks a real chance to bond, change diapers, figure out sleep schedules and actually recover before heading back. It's not just a perk; it's a way to say we care about the messier side of life that doesn't fit neatly into a 9‑to‑5. If you're already on leave, have a due date on the calendar, or just aren't sure what counts, ping HR. They'll send the new policy, walk you through the request form, tell you what paperwork they need and explain how the pay keeps flowing alongside any state or federal programs you might qualify for. Managers, please sit down with your people and HR soon, map out who'll cover the work, figure out hand‑offs, and make sure the leave actually feels like a break, not a "just‑waiting‑for‑my‑email" situation. Thanks for keeping the place supportive and for rolling with these changes. We're proud of this step and will keep hunting for more ways to make benefits feel like a real safety net. Any questions, just drop HR a line. Best, [Your Name]

Phrasly

Rank #8 this cycle · run took 0:18

0/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.05caught
  • Copyleaks0.00caught
  • Originality.ai0.29caught
Median
0.00
Meaning
95.1
Readability
82.0
Words
1.08× 248 → 269
Show output (269 words)

Subject: Announcement: Paid Parental Leave Increased to 20 Weeks Hi team, I'm excited to announce a major enhancement to our benefits package. Effective immediately, we have increased paid parental leave to 20 weeks, for all parents. This increased leave entitlement applies to all eligible birthing and non-birthing parents, as well as employees who take leave for adoption, foster care or surrogacy. We understand that new parents need time to care for their child, balance family logistics and transition into their new routines. We hope this extra time allows parents to rest and bond with their child(ren) without worrying about being away from work too long. We know each family is unique and welcomes new children into their home in different ways. As part of our commitment to your well-being and equity, we increased parental leave to better support you and your families. If you are currently on parental leave, planning to take parental leave in the near future, or have questions about eligibility and timing, please reach out to HR. HR will also provide an updated parental leave policy with details on how to request leave, supporting documentation, pay during leave and how to coordinate this leave with any existing local, state or national leave programs you may be eligible for. Managers should work with employees and HR to plan for extended leaves and ensure employees can fully recharge and disconnect during their time away. Thank you for everything you do for our team and our customers. We are proud to make this change and will continue to seek ways to improve our benefits and resources. Best, [Your Name]

Super Humanizer

Rank #11 this cycle · run took 0:08

0/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.00caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
96.2
Readability
82.0
Words
1.10× 248 → 274
Show output (274 words)

Re: Paid Parental Leave Increases to 20 Weeks Hi team, I’m thrilled to announce a significant enhancement to our benefits, effective immediately: Paid Parental Leave will increase to 20 weeks for all employees. This expanded benefit is inclusive of birthing parents, non-birthing parents, adoptive, foster, and surrogate parents. We want to ensure our employees have the time needed to care for and bond with their new child, manage family transitions, and return to work feeling supported. We recognize that becoming a parent is one of the most significant life events, and we know each journey is unique. Expanding parental leave is just one of the ways we can better serve our employees and align with our core values around employee well-being, equity, and creating a supportive and inclusive workplace. Employees who are currently on parental leave, have a planned leave approaching, or have questions about their eligibility or leave timelines should connect with the HR team. HR will be sharing additional details regarding policy guidelines, including how to initiate a leave request, required documentation, pay continuation policies, and how these benefits may integrate with any applicable local, state or national leave programs. Managers, please collaborate with your team members and HR to ensure adequate coverage and smooth transitions are in place to support employees’ ability to take this time off to disconnect from work. Thank you for your continued dedication in making this a supportive and inclusive environment. We’re proud to take this step and will continue to seek out meaningful ways to improve the benefits and resources we offer. Please don’t hesitate to reach out to HR with any questions. Best, [Your Name]

StealthBypass

Rank #13 this cycle · run took 0:18

0/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.00caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
95.0
Readability
83.0
Words
1.18× 248 → 292
Show output (292 words)

Re: Increased Paid Parental Leave: From 12 Weeks to 20 Weeks Hi team, I have exciting news to share about our benefits! Starting today, we are increasing paid parental leave to 20 weeks for all eligible employees. Our goal with this expanded leave is to provide parents with more dedicated time to bond with and care for their new child, navigate significant family life transitions, and return to work refreshed and supported. Welcoming a child into a family is a significant life milestone and there are many different paths that family life can take. Expanding parental leave reflects our continued commitment to our employees’ well-being and our belief in a fair and inclusive work environment. This increase to paid parental leave is available to all eligible parents, including birth parents, non-birth parents, adoptive parents, foster parents and surrogate parents. Anyone currently on leave, scheduled to take leave soon, or who has questions about eligibility and how to take advantage of this expanded benefit should connect with HR. HR will also share an updated policy document that will clarify procedures for requesting and taking leave, required documentation, how pay will continue while you are on leave and how to coordinate this benefit with local, state or national leave laws. For those who manage a team, please partner with HR and your team members to develop coverage plans and support seamless transitions so that everyone taking parental leave is able to completely disconnect and focus on their family. Thank you all for making our workplace a place where people are supported professionally and personally. We are proud to take this step to enhance the support and benefits we offer our team. Feel free to reach out to HR with any questions. Best, [Your Name]

Session recording