Grok AI Text Detector

Check if text was written by Grok (xAI). Covers Grok 1, 2, 3, Grok 3 Mini, and Aurora. Free, instant, no login required.

Grok 3 & AuroraFree Forever68–80% AccuracyNo Login

AI Text Detector

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0 words — 30 minimum for reliable results
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Analyzing…

Narrative Academic
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Signal Breakdown tap to expand

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Accuracy note: Browser-based detectors achieve ~70–80% accuracy. Use as a screening tool, not sole evidence of AI use. How it works →

What Makes Grok Writing Detectable

Grok was trained heavily on X/Twitter data, giving it a distinctly informal, opinion-forward style that differs significantly from other AI models.

Opinion Without Apology

Grok expresses direct opinions ("This is clearly wrong", "The better approach is...") without the hedging other AI models add. Trained on X/Twitter discourse where strong takes are rewarded.

Real-Time References

Grok frequently cites current events or trends, using phrases like "as of recently" or "currently trending" even when context doesn't require it. Its live data access bleeds into writing style.

Casual Connectors

"Look,", "Here's the thing:", "Let's be honest:" — Grok uses informal discourse markers that ChatGPT avoids but are common on Twitter/X. These openers are a strong Grok signal.

X/Twitter Cultural Framing

References to online discourse, viral posts, or platform-native concepts appear more in Grok than other models. "As many people on social media have noted" is a Grok signature.

Grok Versions This Covers

Grok is the hardest major AI to detect. Casual language and opinion signals are the most reliable across versions.

Grok 1 (~80%)Grok 1.5 / 2 (~75%)Grok 3 Mini (~72%)Grok 3 (~68%)Aurora (~60%)
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Why is Grok hardest to detect? X/Twitter training data produces more varied, informal language than academic or web text. Opinion-expression patterns are the most reliable signal — structural patterns are weaker than with ChatGPT.

Accuracy & Limitations

Grok detection rates are lower than ChatGPT/Claude due to its informal training data:

Unedited Grok 1 / 275–80%
Grok 3 / 3 Mini65–72%
Human-edited Grok output35–55%
Heavily humanized20–40%

Grok Detector FAQ

Yes. Grok's X/Twitter training gives it more varied, informal language. Vocabulary spikes are weaker. Opinion-expression and casual connector patterns are the most reliable signals.
Direct opinions without hedging, casual discourse markers ("Look,", "Here's the thing:"), and real-time trend references. These reflect its X/Twitter training data where strong takes and current events dominate.
Yes, though Aurora scores lower (~60%) because it has improved stylistic variation. Opinion patterns and casual connectors remain the most detectable signals.
Yes, completely free. All detection runs as JavaScript in your browser — no API, no login, no word limits.