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HumanizerBench

StealthGPT

AI Humanizer · stealthgpt.ai
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StealthGPT is an AI humanizer independently benchmarked by HumanizerBench. It ranked #8 of 13 in the July 2026 cycle with an overall score of 61.52/100 — our composite measure of how reliably it evades AI detectors while preserving the original meaning and readability.

61.52 / 100
overall score
81.6 %
median detector bypass rate
33 /33
successful tests
Last tested
Sample size
33
Methodology
v1.2.0

Detector Bypass Rates

Percentage of samples classified as human-written by each detector.

Performance by Category

Bypass rate across writing contexts.

12-Month Trend

Overall score across the past year of testing cycles.

Session recordings

See the full methodology →

Screen captures from the benchmark runs, kept for auditability. Hosted links may expire over time; the JSON in this repo is the source of truth.

Penalties applied this cycle

How penalties work →

The overall score shown above already reflects these deductions.

  • Meaning drift ×2
    −2.0

    The output's meaning drifted significantly from the original input.

  • Length inflation ×5
    −5.0

    The output ran much longer than the input, a common trick that pads text to dilute the AI signal.

  • Length deflation ×3
    −3.0

    The output came back much shorter than the input. The rewrite dropped content instead of paraphrasing it.

Total deducted from overall score −10.0

Minimum monthly pricing

Monthly
$25.50/mo
Free tier
No

How we tested

33 prompts across 7 writing categories, scored by 5 independent AI detectors. Every score is reproducible from the public methodology.

Methodology → Fairness policy →

Compare with

StealthGPT vs
Phrasly
61.47 · rank #9
StealthGPT vs
Walter Writes
62.84 · rank #7
StealthGPT vs
AI Humanize io
59.66 · rank #10

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