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October 2026 results: WriteHuman holds #1, StealthGPT jumps to #2. Read the analysis →
HumanizerBench

Head to head · October 2026 cycle

AI Humanize io vs Undetectable.ai

Undetectable.ai finished 2.9 points ahead of AI Humanize io in the October 2026 cycle, 71.18 to 68.24, ranking #3 against #6 in a field of 14. Undetectable.ai scored higher on 5 of 6 detectors and 4 of 6 writing categories. AI Humanize io came out ahead on penalties (None vs −5.0), blog post prompts (67.5 vs 58.1) and Originality.ai (90.2 vs 88.7). The bypass-rate gap, 66.5 to 74.6, sits inside both tools' 95% confidence intervals, so treat bypass as a draw.

68.24 /100
overall score
#6 /14
rank ▼ 2
+2.94
Undetectable.ai leads →
Detectors
1 – 5
Categories
2 – 4
Components
1 – 4
71.18 /100
overall score
#3 /14
rank ▲ 3

30 prompts · Last tested · Methodology v1.3.0

Score components

What the overall score is made of: bypass rate weighs 42%, meaning preservation 32%, readability 16%, consistency across categories 10%. Output-quality penalties come off the total. How scoring works →

Bypass rate CIs overlap Undetectable.ai by 8.1
66.5 74.6
Meaning preservation Undetectable.ai by 10.6
68.6 79.2
Readability Undetectable.ai by 7.1
56.9 63.9
Consistency Undetectable.ai by 0.3
92.6 93.0
Penalties fewer is better AI Humanize io by 5.0
None −5.0

CIs overlap marks a gap that sits inside both tools' published 95% confidence intervals for that component; it may not survive another cycle.

Detector by detector

Share of each tool's outputs that a detector classified as human-written. Undetectable.ai took 5 of 6.

GPTZero Undetectable.ai by 15.0
70.0 85.0
Originality.ai AI Humanize io by 1.5
90.2 88.7
Copyleaks Undetectable.ai by 14.3
73.6 87.9
Winston AI Undetectable.ai by 8.6
89.9 98.5
ZeroGPT Undetectable.ai by 8.3
75.4 83.8
Pangram Undetectable.ai by 3.5
0.0 3.5

Writing categories

Category score per writing context: bypass credit only for real rewrites, blended with the category's own meaning preservation and readability. Small categories swing; the prompt count is shown on each row. How category scores work →

Academic Essay Application Essay Blog Post Marketing Copy Discussion Board News Article Academic Essay: AI Humanize io 70.2 · Undetectable.ai 69.0 Application Essay: AI Humanize io 63.0 · Undetectable.ai 76.4 Blog Post: AI Humanize io 67.5 · Undetectable.ai 58.1 Marketing Copy: AI Humanize io 63.8 · Undetectable.ai 71.5 Discussion Board: AI Humanize io 65.7 · Undetectable.ai 69.4 News Article: AI Humanize io 60.4 · Undetectable.ai 61.4
AI Humanize io Undetectable.ai Outer ring = 100
Academic Essay 6 prompts AI Humanize io by 1.2
70.2 69.0
Application Essay 6 prompts Undetectable.ai by 13.3
63.0 76.4
Blog Post 6 prompts AI Humanize io by 9.4
67.5 58.1
Marketing Copy 6 prompts Undetectable.ai by 7.6
63.8 71.5
Discussion Board 3 prompts Undetectable.ai by 3.7
65.7 69.4
News Article 3 prompts Undetectable.ai by 1.0
60.4 61.4

Head-to-head history

Overall score in every cycle both tools were tested. Undetectable.ai has finished ahead in 3 of 5 shared cycles.

50 60 70 80 90 June 2026 July 2026 August 2026 September 2026 October 2026 June 2026: Undetectable.ai 80.09 (#5) June 2026: AI Humanize io 72.95 (#6) July 2026: Undetectable.ai 72.17 (#2) July 2026: AI Humanize io 59.66 (#10) August 2026: Undetectable.ai 61.49 (#8) August 2026: AI Humanize io 64.57 (#6) September 2026: Undetectable.ai 71.75 (#6) September 2026: AI Humanize io 72.94 (#4) October 2026: Undetectable.ai 71.18 (#3) October 2026: AI Humanize io 68.24 (#6) 68.2 71.2
AI Humanize io Undetectable.ai
Cycle AI Humanize io Undetectable.ai Margin
October 2026 68.24 #6 71.18 #3 → 2.9
September 2026 72.94 #4 71.75 #6 ← 1.2
August 2026 64.57 #6 61.49 #8 ← 3.1
July 2026 59.66 #10 72.17 #2 → 12.5
June 2026 72.95 #6 80.09 #5 → 7.1

Where each one wins

Every measure above that one tool won outright, largest margin first within each group.

AI Humanize io

4 wins
  • Penalties Score None vs −5.0
  • Originality.ai Detector 90.2 vs 88.7
  • Blog Post Category 67.5 vs 58.1
  • Academic Essay Category 70.2 vs 69.0

Undetectable.ai

13 wins
  • Meaning preservation Score 79.2 vs 68.6
  • Bypass rate Score 74.6 vs 66.5
  • Readability Score 63.9 vs 56.9
  • Consistency Score 93.0 vs 92.6
  • GPTZero Detector 85.0 vs 70.0
  • Copyleaks Detector 87.9 vs 73.6
  • Winston AI Detector 98.5 vs 89.9
  • ZeroGPT Detector 83.8 vs 75.4
  • Pangram Detector 3.5 vs 0.0
  • Application Essay Category 76.4 vs 63.0
  • and 3 more

Same prompt, both outputs

Both tools were given this AI-written passage in the October 2026 cycle. Below it is what each one returned. This prompt was picked by a fixed rule, not by how the tools scored.

Cover Letter · Application Essay · written by gpt-6-sol · 393 words

Dear Hiring Manager,

I am excited to apply for the freelance documentary editor position. I love shaping real stories into films that feel honest, engaging, and memorable. Your project offers the chance to do what I value most as an editor: find the emotional thread in a wealth of material and build a narrative that respects both the people on screen and the audience watching.

My approach begins with listening. Before I make major cuts, I spend time with the footage, interviews, and production notes to understand what the contributors are saying and what may be unfolding beneath the surface. From there, I look for a structure that gives the story momentum without forcing it into a shape it does not fit. I pay close attention to pacing, transitions, and the relationship between dialogue, images, and sound, while keeping the film’s central question in view.

Freelance work has taught me to be both collaborative and self directed. I welcome thoughtful feedback, communicate clearly about editorial choices, and stay organized through revisions and delivery. I am comfortable working closely with directors and producers to test different approaches, whether that means rethinking an opening, tightening an interview sequence, or finding a more satisfying ending. I also know when to step back, offer a fresh perspective, and let the strongest moments breathe.

What draws me to documentary editing is the balance of craft and responsibility. A strong cut can create tension, clarity, and feeling, but it should never lose sight of the real people behind the footage. I aim to build trust with collaborators by handling sensitive material carefully, flagging questions early, and remaining open to nuance. When a story changes direction in the edit, I see that not as a setback but as an opportunity to follow what the material reveals.

I would bring curiosity, patience, and a sharp eye for story to this project. I can adapt to your workflow, maintain a reliable editing schedule, and provide clear versions for review so the team can make decisions efficiently. Whether the assignment calls for a rough cut, fine cut, or targeted sequence work, I would be glad to help bring the documentary to its strongest form.

Thank you for considering my application. I would welcome the opportunity to discuss the project, your editorial goals, and how I could contribute to the team.

Sincerely, [Your Name]

Show the full input

335 words (input 393)

To the Hiring Manager,

I am thrilled to submit my application for the freelance documentary editor role. I love the challenge of transforming real-life stories into films that are authentic, interesting, and unforgettable. Your project gives me the chance to fulfill my desire as an editor to find the emotional thread amid the vast amount of material and create a story that respects both the people who appear in the produced film and the viewers.

The first step is to listen. Instead of making cuts, I spend time gathering the footage, interviews, and production notes so as to ensure I get the message from contributors and perhaps sense what they have not pronounced openly. Next, I try to look for a structure that will allow the story to unfold naturally but has some dynamics. I work carefully with pacing, transitions, dialogue, images, and sound.

Freelance work has taught me to balance between being collaborative and self-sufficient. I really appreciate getting constructive comments from other filmmakers and stay organized at all stages from revisions to delivery. I have no problems collaborating with directors and producers in order to try different solutions. At the same time, I know when to stop, provide a fresh opinion, and give the most interesting parts of the footage a chance to speak.

I am drawn to documentary editing because it requires sometimes technical but mostly ethical approach. The good cut has to create tension, clarity, and feelings but does not have to forget about the people involved. I put great emphasis on the sensitive treatment of the material, early flagging of issues, and awareness of the subtleties of the given matter.

As for the project, I will be able to show my curiosity, patience, and sharp eye for storytelling. I can adapt to your editing workflow, stick to the editing timetable, and produce quality versions of the produced film.

Thank you for taking the time to read my cover letter. I hope to discuss the project with you.

Sincerely, [Your Name]

Show the full output
  • GPTZero0.00caught
  • Pangram0.00caught
  • Winston AI0.99passed
  • ZeroGPT0.14caught
  • Copyleaks0.00caught
  • Originality.ai1.00passed

Passed 2 of 6 detectors.

Every AI Humanize io run in October 2026 →

470 words (input 393)

Dear Hiring Manager,

Thank you for posting this freelance documentary editor work opportunity. I really love taking true stories and making them into films that are real, engaging and memorable. Your project sounds like a wonderful opportunity for me to do what I feel is most important as an editor: to find the core of any abundance of information and create a meaningful narrative for the characters in the film as well as the audience watching.

First, I try to understand what the contributors are trying to say. Once I have listened to all of the footage, interviews, and production notes, I start looking for a structure. It is very important to me that the film does not get forced into a shape that it doesn’t want to take, but rather that it gets to develop naturally into a compelling and engaging story. The way that I achieve this is by paying close attention to the pacing, the transitions between scenes, the dialogue, the images and the sounds. And throughout it all, I keep the central question of the film close at hand.

As a freelance editor, I am used to being both a collaborative and self-motivated editor. I would ensure clear communication throughout the editorial process, the organization of any amendments and the timely delivery of all versions of the edit. Furthermore, I am open to feedback from directors and producers, testing different approaches to scenes and offering alternative solutions to problems. I am also confident in knowing when to step back and allow the strongest parts of the edit to breathe.

Why Documentary Editing is My Favorite Kind of Work to Do: I love a strong cut, to create tension and clarity and feeling, and I have the greatest respect for the real people featured in documentaries. I try to work with all colleagues in the greatest respect as well, handling sensitive material with the greatest care, flagging up any questions that I have, and generally trying to be as nuanced as possible. I also believe that when a story takes a different turn in the edit, it is an opportunity to see where the material that you have been given takes you.

I would bring to this project curiosity, patience and a very critical eye to ensure the best story possible. I can adapt to your workflow and editors’ tools as well as maintain a regular schedule for the work needed for the documentary. I can also provide different versions of an edited sequence as needed and maintain clear versions for the team’s review.

Thank you for your time to consider my application for the Freelance Documentary Editor position. I look forward to speaking with you about the project, my goals for the film and how I can be of service to your team.

Sincerely, [Your Name]

Show the full output
  • GPTZero0.00caught
  • Pangram0.00caught
  • Winston AI1.00passed
  • ZeroGPT0.89passed
  • Copyleaks1.00passed
  • Originality.ai1.00passed

Passed 4 of 6 detectors.

Every Undetectable.ai run in October 2026 →

Each chip is one detector's score for that output, from 0 (AI) to 1 (human). A score of 0.50 or higher counts as a pass and shows green; below that the detector caught it and the chip shows red.

Questions people ask

Is AI Humanize io better than Undetectable.ai?

Undetectable.ai finished 2.9 points ahead of AI Humanize io in the October 2026 cycle, 71.18 to 68.24, ranking #3 against #6 in a field of 14. Undetectable.ai scored higher on 5 of 6 detectors and 4 of 6 writing categories. Both tools ran the same 30 prompts, scored by the same 6 detectors, under methodology v1.3.0; every input, output and verdict is published.

Which bypasses AI detectors better, AI Humanize io or Undetectable.ai?

Undetectable.ai posted the higher bypass rate, 74.6 vs 66.5, and scored higher on 5 of 6 detectors. AI Humanize io led on Originality.ai; Undetectable.ai led on GPTZero, Copyleaks, Winston AI, ZeroGPT and Pangram. The overall bypass gap is inside both 95% confidence intervals, so it is not a reliable difference.

Do AI Humanize io and Undetectable.ai keep the original meaning?

Undetectable.ai preserved meaning better, 79.2 vs 68.6 on our 0–100 similarity scale. On readability, Undetectable.ai rated higher, 63.9 vs 56.9. Penalties this cycle: AI Humanize io None, Undetectable.ai −5.0.