June 2026 prompt evidence
Each of these 30 prompts was written by a frontier model, then handed to all 13 ranked humanizers, and every rewrite was submitted to 5 commercial AI detectors. Every run was screen-recorded. Open a prompt to read the input, every tool's rewrite, each detector's verdict, and to watch the recording of that run.
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.
| Prompt | Category | Written by | Input words | Passed | Failed | Hardest | Open |
|---|---|---|---|---|---|---|---|
| 01 Listicle Blog | Blog Post | claude-opus-4-7 | 386 | 7 | 12 | ||
| 02 Lit Review | Academic Essay | Gemini 3.5 Flash | 390 | 9 | 9 | ||
| 03 Discussion Post | Discussion Board | claude-opus-4-7 | 261 | 9 | 7 | ||
| 04 Cover Letter | Application Essay | Gemini 3.5 Flash | 367 | 0 | 13 | ||
| 05 Landing Copy | Marketing Copy | GPT-5.5 | 307 | 6 | 11 | ||
| 06 Product Desc | Marketing Copy | claude-opus-4-7 | 196 | 6 | 10 | ||
| 07 Argumentative Essay | Academic Essay | claude-opus-4-7 | 385 | 8 | 8 | ||
| 08 News Article | News Article | claude-opus-4-7 | 390 | 5 | 12 | ||
| 09 Product Desc | Marketing Copy | GPT-5.5 | 195 | 6 | 10 | ||
| 10 Landing Copy | Marketing Copy | Gemini 3.5 Flash | 281 | 5 | 12 | ||
| 11 Discussion Post | Discussion Board | Gemini 3.5 Flash | 242 | 10 | 7 | ||
| 12 Howto Blog | Blog Post | Gemini 3.5 Flash | 386 | 3 | 11 | ||
| 13 Personal Statement | Application Essay | GPT-5.5 | 364 | 5 | 10 | ||
| 14 Cover Letter | Application Essay | claude-opus-4-7 | 397 | 2 | 13 | ||
| 15 Argumentative Essay | Academic Essay | GPT-5.5 | 435 | 8 | 7 | ||
| 16 Howto Blog | Blog Post | claude-opus-4-7 | 398 | 8 | 9 | ||
| 17 Personal Statement | Application Essay | Gemini 3.5 Flash | 341 | 6 | 12 | ||
| 18 Lit Review | Academic Essay | claude-opus-4-7 | 390 | 7 | 10 | ||
| 19 Listicle Blog | Blog Post | Gemini 3.5 Flash | 450 | 10 | 7 | ||
| 20 Listicle Blog | Blog Post | GPT-5.5 | 450 | 9 | 8 | ||
| 21 Product Desc | Marketing Copy | Gemini 3.5 Flash | 173 | 7 | 11 | ||
| 22 News Article | News Article | GPT-5.5 | 460 | 10 | 10 | ||
| 23 Argumentative Essay | Academic Essay | Gemini 3.5 Flash | 394 | 5 | 12 | ||
| 24 Personal Statement | Application Essay | claude-opus-4-7 | 359 | 8 | 11 | ||
| 25 Discussion Post | Discussion Board | GPT-5.5 | 257 | 6 | 8 | ||
| 26 Howto Blog | Blog Post | GPT-5.5 | 438 | 7 | 6 | ||
| 27 Cover Letter | Application Essay | GPT-5.5 | 388 | 4 | 11 | ||
| 28 Lit Review | Academic Essay | GPT-5.5 | 435 | 8 | 11 | ||
| 29 News Article | News Article | Gemini 3.5 Flash | 396 | 5 | 10 | ||
| 30 Landing Copy | Marketing Copy | claude-opus-4-7 | 314 | 3 | 13 |
"Passed" counts the ranked tools whose rewrite of that prompt at least 4 of the 5 detectors scored as human-written (0.50 or above); "Failed" counts those flagged by at least one detector that scored them; "Hardest" is the single detector that flagged the most rewrites of that prompt.
Recordings
Every tool was run in a recorded sitting. Each recording opens here from the start; the outputs pages jump to the exact moment a prompt was run.
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Stealth Writer 6:32 · 30 prompts · Jun 2, 2026
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WriteHuman 7:25 · 30 prompts · Jun 1, 2026
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HIX Bypass 11:26 · 30 prompts · Jun 2, 2026
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Humbot 14:51 · 30 prompts · Jun 2, 2026
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Undetectable.ai 8:49 · 30 prompts · Jun 1, 2026
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AI Humanize io 12:24 · 30 prompts · Jun 2, 2026
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StealthGPT 12:59 · 30 prompts · Jun 1, 2026
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Phrasly 13:22 · 30 prompts · Jun 2, 2026
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Humanize AI Pro 8:49 · 30 prompts · Jun 2, 2026
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Walter Writes 16:17 · 30 prompts · Jun 2, 2026
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Super Humanizer 5:13 · 30 prompts · Jun 2, 2026
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Grammarly 9:37 · 30 prompts · Jun 2, 2026
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NoteGPT 12:41 · 30 prompts · Jun 2, 2026
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BypassGPT not ranked this cycle 16:46 · 30 prompts · Jun 2, 2026