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

← August 2026 prompts

Product Desc · GPT-5.5

Marketing Copy · written by GPT-5.5 · 184 words · prompt product_desc

7
passed at least 4 detectors
8
failed at least one detector
12
tools tested on this prompt
GPTZero
hardest detector, caught 7 of 12

Input passage

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

Stay hydrated wherever life takes you with this premium stainless-steel insulated water bottle, designed for durability, convenience, and everyday style. Built from high-quality, food-grade stainless steel, it resists rust, dents, and lingering flavors, making it ideal for water, coffee, tea, smoothies, or sports drinks. Its double-wall vacuum insulation helps keep beverages cold for up to 24 hours or hot for up to 12 hours, so every sip is just the way you like it. The leak-resistant lid is perfect for tossing into a backpack, gym bag, or car cup holder without worrying about spills. A wide-mouth opening makes it easy to add ice cubes, refill quickly, and clean thoroughly, while the smooth exterior finish offers a comfortable grip and a modern look. Whether you’re commuting, hiking, working out, traveling, or simply staying hydrated at your desk, this bottle is made to keep up. Reusable and eco-friendly, it helps reduce single-use plastic waste while delivering reliable performance day after day. Sleek, practical, and built for busy routines, this insulated water bottle is the perfect companion for home, office, school, outdoor adventures, and everything in between.

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 0:19

5/5 detectors passed
  • GPTZero1.00passed
  • Winston AI1.00passed
  • ZeroGPT0.63passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
88.6
Readability
48.0
Words
0.98× 184 → 181
Show output (181 words)

Follow you wherever life takes you with this sleek design insulated stainless steel water bottle. This water bottle is ideal for both hot and cold drinks. The double wall design keeps your drinks cold for at least 24 hours and hot drinks for at least 12 hours. The premium food grade stainless steel is durable to rust, dent, and hold on to stains and smells. Equipped with a leak proof lid, you can take this water bottle with you while playing sports and travelling. The wide mouth design helps this water bottle stay clean, since it can hold ice and is easily cleanable. The design of this water bottle has a secure grip with a smooth exterior, and is aesthetically pleasing. Wherever you go to stay hydrated, this water bottle is your ideal companion. Integrating this into your daily life is easy, and it helps you maintain an eco-friendly lifestyle to stop single-use plastic. The modern design can be used for any occasion, and fits into your busy schedule. This is a reliable water bottle for any activity, and any environment.

Humanize AI Pro

Rank #2 this cycle · run took 0:21

5/5 detectors passed
  • GPTZero1.00passed
  • Winston AI1.00passed
  • ZeroGPT1.00passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
87.1
Readability
55.0
Words
1.02× 184 → 187
Show output (187 words)

Hydrate wherever your activities might take you with the best stainless-steel insulated water bottle designed to last through many years of tough use. It is manufactured using premium-grade, food-safe, rust-proof, dented proof and non-leaching stainless steel to provide an excellent performance in holding both hot and cold beverages. With the double-wall vacuum insulation technology, it keeps any liquid inside either up to 12 or up to 24 hours respectively according to the temperature. With a leak-proof cap, it will be easy to carry in a back or travel pack, as well as in a car cup holder without any worries of leaking. The wide opening enables filling it with ice cubes, cleaning it easily, and drinking comfortably from. Also, with a sleek exterior finish, the bottle can easily be gripped, ensuring convenience. Ideal when you are on the move and need something to drink while going about. It is reusable, meaning that you will avoid the constant purchase of one-use plastic water bottles and save nature and your money. It comes in handy in almost all activities from commuting and travelling to hiking and other outdoor activities.

AI Humanize io

Rank #6 this cycle · run took 0:14

5/5 detectors passed
  • GPTZero0.53passed
  • Winston AI1.00passed
  • ZeroGPT1.00passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
86.3
Readability
48.0
Words
0.78× 184 → 143
Show output (143 words)

This premium stainless steel insulated water bottle takes you to your desired destination keeping water and other beverages insulated. From making sure it is easy to carry it with you and gives a modern look, the stainless steel water bottle has been made with high quality food grade stainless steel, meaning it does not rust, dent or impart any everlasting tastes. The double wall vacuum insulation helped in keeping drinks like smoothies or tea for up to 24 hours cold or hot. The lid is leakproof and can go either in the backpack, car cup holder or the gym bag with you. It also comes with a wide mouth allowing you to add ice cubes or clean the water bottle. Whether you are traveling, walking, or are busy at your office desk, it is the best water bottle out there at all times.

Undetectable.ai

Rank #8 this cycle · run took 0:20

5/5 detectors passed
  • GPTZero1.00passed
  • Winston AI1.00passed
  • ZeroGPT0.79passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
1.00
Meaning
85.2
Readability
42.0
Words
1.34× 184 → 247
Show output (247 words)

A premium stainless-steel insulated water bottle designed for the modern person. This stainless steel water bottle has been designed with durability and everyday use in mind. Our premium stainless steel water bottles are made from the highest quality food-grade stainless steel that is resistant to rust, denting and will not transfer any flavors. We have designed this bottle to hold a variety of liquids including water, coffee, tea, smoothies and sports drinks. Our Leak Resistant Stainless Steel Water Bottle is the perfect travel companion. Whether you are packing it in your Backpack, Gym Bag, Brief Case or placing it in your car’s cup holder this insulated water bottle is ready for action. It’s easy to add ice to the wide mouth, to fill up with water on the go, and to clean. The smooth exterior finish of this Stainless Steel Water Bottle provides a secure grip. The Insulated Stainless Steel Water Bottle is stylish enough to use at the office, in school or any other activity you do on the go. Reusable and eco-friendly this water bottle helps to prevent single use plastic bottles from entering the waste stream while delivering lots of great uses. Reusable and ecological, this insulated bottle will help to prevent the use of single use plastic bottles while delivering excellent performance on a daily basis. A sleek and practical water bottle to take with you everywhere: at home, in the office, at school, during your sport or for any other outdoor activity.

Stealth Writer

Rank #3 this cycle · run took 0:19

4/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.98passed
  • ZeroGPT0.56passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
0.98
Meaning
87.8
Readability
42.0
Words
1.14× 184 → 210
Show output (210 words)

This high-quality insulated water bottle is made of premium stainless steel that is designed to keep your water hot or cold without any hassles, making it ideal for use at any hotspot, office, or gym. Constructed of superior, food-grade stainless steel, will not rust, dent or harbor flavors, perfect for water, coffee, tea, smoothies or sports drinks. At least 24 hours to keep a beverage cold and up to 12 hours to list it piping hot, with double-wall vacuum insulation, every sip will be the way that you like it. A lid that won't leak for tossing in the backpack, gym bag or car cup holder. Doubling the mouth opening allows for the addition of ice cubes, quick refill and complete cleaning and at the same time, with its smooth exterior finish ensures comfortable grip and a modern look. Great for commuting, hiking, exercising on the go, traveling or simply replacing water at the office, this bottle is designed to keep you hydrated all day long. It's reusable and eco-friendly, minimizes the amount of single-use plastic waste and performs effectively every day. With their sleek design, practicality and ability to be used during busy routines, this insulated water bottle is ideal for home, office, school and outdoor activities, and more.

HIX Bypass

Rank #4 this cycle · run took 0:14

4/5 detectors passed
  • GPTZero0.00caught
  • Winston AI1.00passed
  • ZeroGPT1.00passed
  • Copyleaks1.00passed
  • Originality.ai0.98passed
Median
1.00
Meaning
91.6
Readability
30.0
Words
1.21× 184 → 222
Show output (222 words)

Our premium stainless-steel insulated bottle has been designed with you in mind to keep your drink suitable for the occasion no matter where life takes you — Durable, ultra-convenient and easy to carry every day. It is made of food-grade premium steel, so it will not rust or dent easily and keep flavors intact as well — Makes for water coffee tea smoothies sports drinks. The double-wall vacuum insulated body helps to maintain temperature for up to 24 hours with cold drinks and up to 12 hours hot, so every sip is as you far prefer.  Thanks to a leak-resistant lid, it's ideal for tossing into a backpack, gym bag or car cup holder without fear of dribbles. The wide mouthed opening allows you to fill it with ice, refill at ease and also clean thoroughly while the exterior finish feels right in your hands as well gives a modern look. For anything from the daily commute to hiking, working out and travel or just staying hydrated at your desk. Durable and great for the environment, holding up against surface water also greatly reduces reliance upon single-use plastic while offering a blanket of dependable performance day in, day out. Designed with style and practicality in mind, our insulated water bottle is the ideal companion at home, work, school or on any adventure.

Walter Writes

Rank #9 this cycle · run took 0:23

4/5 detectors passed
  • GPTZero0.99passed
  • Winston AI0.98passed
  • ZeroGPT0.48caught
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
0.99
Meaning
88.3
Readability
62.0
Words
1.23× 184 → 226
Show output (226 words)

The bottle has been designed with both form and function in mind. The premium stainless steel construction gives you an item that will last; one that won’t crack, dent, or retain taste. This versatile insulated bottle is great for water, coffee, tea, smoothie’s or even sports drink on-the-go. Your beverage of choice will be kept at the desired temperature by utilizing the double-walled vacuum insulation which keeps liquids cold for up to twenty-four (24) hours or hot for twelve (12) hours. The leak-proof lid provides a convenient design allowing you to toss it into a backpack, gym bag or car cup holder without having to worry about spilling anything. The large mouth allows you to easily pour in ice cubes, quickly fill it back up and also clean it properly. In addition, the smooth finish of the outside of the bottle makes for an easy to hold and visually appealing product. From your daily commute to hiking, fitness classes, travel, or just need something to stay hydrated while sitting at work this bottle is there for you. The bottle is reusable and environmentally friendly. It eliminates single-use plastics and consistently performs each time you use it. With its sleek design and functionality for a busy lifestyle this insulated water bottle is a fantastic option for school, work, home, outdoors activities and anywhere else you may go.

Humbot

Rank #5 this cycle · run took 0:21

3/5 detectors passed
  • GPTZero0.00caught
  • Winston AI1.00passed
  • ZeroGPT0.48caught
  • Copyleaks1.00passed
  • Originality.ai0.58passed
Median
0.58
Meaning
90.7
Readability
38.0
Words
1.08× 184 → 198
Show output (198 words)

This durable, easy-to-use, versatile and stylish stainless-steel insulated water bottle keeps you hydrated no matter where life takes you. Constructed from 18/8 food-grade stainless steel, it won't rust, dent or retains flavors which makes it the perfect drink container for everything from water to coffee and tea to smoothies or sports drinks. The double-wall vacuum insulation keeps drinks cold for up to 24 hours and hot for 12, so every sip is just as you like it. It has a kid-resistant lid (to toss in your backpack, gym bag or any cup holder without worrying about spills). Wide mouth for ease of adding ice cubes, refilling fast & easy to clean on the inside with a smooth exterior surface that gives an excellent grip and a glossy look. It was designed to allow you to take it with you while commuting, hiking, exercising, traveling — even staying hydrated while sitting at your desk. Something that is washing machine safe and made out of eco-friendly material to cut down on single-use plastic waste while also providing consistent day-after-day service. The insulated water bottle that keeps your routines sleek, practical and built for home, office, school or the great outdoors!

Super Humanizer

Rank #10 this cycle · run took 0:13

3/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.04caught
  • ZeroGPT0.60passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
0.60
Meaning
93.9
Readability
52.0
Words
1.28× 184 → 236
Show output (236 words)

Keep yourself hydrated and happy throughout the day, no matter where your adventures lead you with this premium stainless steel insulated water bottle. It is crafted for lasting quality, ease of use, and a stylish everyday companion that will never let you down. Constructed with high-quality, food-grade stainless steel, this bottle is rust resistant, durable, and flavor free, allowing you to enjoy your beverage whether it is water, coffee, tea, or a sports drink. Each bottle features double-wall vacuum insulation to keep your drinks icy cold for up to 24 hours or piping hot for up to 12 hours! The leak-proof lid is ideal for throwing this bottle in your backpack or purse when on the go, as well as in your car's cup holder without the worry of spills. The wide mouth design allows for easy cleaning, quick refilling of drinks and adding of ice cubes, and the smooth exterior finish makes for a comfortable and sleek grab and feel. From work commutes, to gym workouts, to long-distance travel or outdoor explorations, this insulated water bottle was built to provide and outperform every of your needs, daily. Its reusable construction makes for an ideal, eco-friendly alternative to single use plastic waste that will have you reaching for it day after day with the same dependable quality. This Sleek, practical, durable, insulated water bottle is the perfect companion for home, office, school, and everywhere in between!

Phrasly

Rank #7 this cycle · run took 0:30

2/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.29caught
  • ZeroGPT0.27caught
  • Copyleaks1.00passed
  • Originality.ai1.00passed
Median
0.29
Meaning
93.5
Readability
72.0
Words
0.85× 184 → 157
Show output (157 words)

Drink water wherever your adventures take you with this top-rated stainless steel insulated bottle. Durable, convenient, and stylish enough for everyday use, this water bottle is made of premium food-grade stainless steel that won’t rust, dent or hold onto stubborn flavors from water, coffee, tea, smoothies or sports drinks. Double wall vacuum insulation keeps drinks cold for 24 hours and hot for 12 hours so you can enjoy every sip at the perfect temperature. Leak-proof lid easily slides into a backpack, gym bag or car cup holder with no worries of spills. Plus, wide-mouth opening allows for ice cube storage, quick refills and easy cleaning. Enjoy a comfortable hold and sleek design with the smooth exterior. Stay hydrated on the go at work, while commuting, hiking, working out, traveling or enjoying your favorite beverage at your desk. Built to last and reduce single-use plastics, this reusable stainless steel bottle is convenient for home, office, school and outdoors.

StealthGPT

Rank #12 this cycle · run took 0:23

1/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.00caught
  • Copyleaks1.00passed
  • Originality.ai0.01caught
Median
0.00
Meaning
89.7
Readability
68.0
Words
1.05× 184 → 193
Show output (193 words)

Keep drinking on the go with this Stainless Steel Insulated Water Bottle that’s designed to be durable, convenient, and stylish for daily use. Made with high-grade, food-safe stainless steel that’s resistant to rusting, denting, and odor retention, it’s suitable for water, coffee, tea, smoothies, or sports drinks. It features double-wall vacuum insulation that keeps your drinks cold for up to 24 hours or hot for up to 12 hours, ensuring that you always enjoy your beverage exactly how you want it. Its leak-resistant lid makes it easy to carry in a backpack, gym bag, or car cup holder without the worry of spilling. The wide mouth allows for easy addition of ice, quick refilling, and thorough cleaning, and its smooth surface provides a secure grip and sleek design. Ideal for use during commutes, hikes, workouts, travel, or at the office, it’s constructed to follow you on all your daily activities. It is reusable and environmentally friendly, which means you can help to reduce the amount of single-use plastic waste by using it daily. Perfect for home, office, school, or on-the-go, this Stainless Steel Insulated Water Bottle is a great choice for busy lifestyles.

Grammarly

Rank #11 this cycle · run took 0:13

0/5 detectors passed
  • GPTZero0.00caught
  • Winston AI0.00caught
  • ZeroGPT0.00caught
  • Copyleaks0.00caught
  • Originality.ai0.00caught
Median
0.00
Meaning
99.4
Readability
68.0
Words
1.02× 184 → 188
Show output (188 words)

Stay hydrated wherever life takes you with this premium stainless-steel insulated water bottle. It’s designed for durability, convenience, and everyday style. Made from high-quality, food-grade stainless steel, it resists rust, dents, and lingering flavors. This makes it ideal for water, coffee, tea, smoothies, or sports drinks. Its double-wall vacuum insulation keeps beverages cold for up to 24 hours or hot for up to 12 hours, so every sip is just the way you like it. The leak-resistant lid is perfect for tossing into a backpack, gym bag, or car cup holder. You won’t have to worry about spills. A wide-mouth opening makes it easy to add ice cubes, refill quickly, and clean thoroughly. The smooth exterior finish offers a comfortable grip and a modern look. Whether you’re commuting, hiking, working out, traveling, or staying hydrated at your desk, this bottle is made to keep up with you. It’s reusable and eco-friendly, helping reduce single-use plastic waste. It delivers reliable performance day after day. Sleek, practical, and built for busy routines, this insulated water bottle is the perfect companion for home, office, school, outdoor adventures, and everything in between.

Session recording