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Grok AI Detector for Grok 4.6, 4.5 and 4.20

Paste an X post, article, essay, or document to check for Grok-generated writing. Review AI, mixed, and human scores plus the sentences that influenced the result.
Content
Paste Text⌘Vor click
Upload DocumentTXT.DOCX.PDF
Try Example:
ChatGPT
Claude
Human
Human + AI
0 words
Result
AI-generated
?%
Mix-generated
?%
Human-written
?%
Add text and click "Detect AI" to see the results.
Highlighted AI-Generated/Paraphrased Sentences
List sentences likely AI-generated here

Recent History

350K+
Scans Performed Monthly
99%
Proven Accuracy Rate
4.9
Average User Rating

Why Choose Our Grok AI Detector

Current Grok Model Coverage

Current Grok Model Coverage

Check writing from Grok 4.6, Grok 4.5, Grok 4.20, and earlier Grok model families.

Sentence-Level Evidence

Sentence-Level Evidence

See which lines look AI-written or mixed instead of relying on one document-level score.

Edited Draft Detection

Edited Draft Detection

Review Grok output that has been shortened, paraphrased, or partly rewritten by a person.

Paste or Upload Files

Paste or Upload Files

Paste text directly or upload a DOCX, PDF, or TXT file without converting it first.

AI, Mixed, Human Scores

AI, Mixed, Human Scores

Read three separate percentages so blended drafts are not forced into a simple yes-or-no label.

Private Text Processing

Private Text Processing

Keep the existing no-training and privacy positioning already approved on this page.

Detect Grok 4.6, Grok 4.5 and Grok 4.20 Text

Use the Grok AI text detector to check output from current Grok model families, including Grok 4.6, Grok 4.5, and Grok 4.20. Lynote analyzes the submitted writing and returns AI, mixed, and human probabilities instead of trying to identify authorship from tone alone.

See Which Sentences Look AI-Written

A single percentage cannot show what triggered the result. Lynote highlights the sentences that carry stronger AI-writing signals, helping you separate a fully generated passage from a draft that combines Grok output with human editing.

Check X Posts, Articles and Uploaded Documents

Paste a long X post, reply, article, or essay into the detector, or upload a DOCX, PDF, or TXT file. This keeps the review focused on Grok AI writing rather than forcing every source into the same copy-paste workflow.

Which Grok Models Can This AI Detector Check?

Use the Grok AI detector to check writing produced or edited with Grok 4.6, Grok 4.5, Grok 4.20, and earlier Grok models. The report evaluates the submitted text and returns AI, mixed, and human probabilities with sentence highlights.

Current and Earlier Grok Models

Current model focus: Grok 4.6 is xAI's current flagship, while Grok 4.5 and Grok 4.20 remain important recent model families for generated text.

Earlier model support: You can also check writing from Grok 4.1, Grok 4 Fast, and Grok 3. These names are included as earlier model families, not presented as current releases.

How to read the result: Lynote identifies AI-writing signals in the submitted passage. A probability report can support review, but it cannot prove which exact Grok version produced the text.

If the source model is unknown, use the general AI detector to screen the draft across model families.

Grok 4.6Grok 4.5Grok 4.20Grok 4.1Grok 4 FastGrok 3
Grok AI Writing Signals
Pattern RepetitionHigh
Sentence PredictabilityHigh
Lexical VariationMedium
Human-AI Style ShiftsMedium
3-WayProbability Report
3File Formats
6Grok Model Families

How to Check Text With the Grok AI Detector

Paste Text or Upload a File

Paste Text or Upload a File

Paste the suspected Grok text into the input box, or upload a DOCX, PDF, or TXT file. Longer samples usually give the report more writing patterns to evaluate.

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Click Detect AI

Click Detect AI

When the text is ready, click Detect AI. This button label stays unchanged because it matches the live interface.

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Review the Score and Highlights

Review the Score and Highlights

Compare the AI, mixed, and human percentages, then read the highlighted sentences. Use the result as a review signal alongside the draft history, sources, and context.

Who Should Use This Grok AI Detector?

Educators

Educators

Screen essays and assignments for Grok-style AI writing, then review the highlighted passages before making an academic-integrity decision.

Content Editors

Content Editors

Check articles and contributor drafts for Grok-assisted sections before editing, approving, or requesting source notes.

Social Media Reviewers

Social Media Reviewers

Review long X posts, threads, and replies when you need more than a quick judgment based on tone.

Journalists

Journalists

Check submitted statements, press materials, or source-provided documents and identify passages that need closer verification.

Community Moderators

Community Moderators

Screen longer forum posts or repeated replies for AI-writing signals without treating every polished sentence as proof of automation.

Publishers

Publishers

Review manuscript chapters, reports, or edited drafts and separate likely AI-heavy passages from mixed human-AI writing.

What Our Users Say

Arthur Pendelton

High School Educator

starstarstarstarstar

"This tool is useful for checking student essays submitted as .docx files. It evaluates structured documents for Grok-like conversational tone."

Carlos Mendoza

Social Media Reviewer

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"I use this AI detector for Grok to review long-form X posts before sharing them. It is specifically tailored to spot AI patterns quickly."

Kenji Sato

Senior Content Editor

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"The report breaks down text into AI-generated, mixed, and human-written percentages. Using the mixed percentage helps me find blended AI text in PDF reports."

Jamal Washington

Investigative Journalist

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"It highlights specific sentences that exhibit Grok's paraphrased or overly formal patterns. Spotting AI sentences in source-provided .txt quotes saves me hours."

Elena Rostova

Community Moderator

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"The paste box is great for quick checks. I regularly scan long forum posts to spot AI-written replies."

Priya Desai

Acquisitions Publisher

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"I appreciate the GDPR-minded processing and no-training policy. It helps when our team checks confidential manuscript drafts."

Grok AI Detector FAQ

Answers about current Grok models, uploaded files, short text, probability scores, false positives, privacy, and next steps.

Yes. The page is designed to screen writing produced or edited with current Grok model families, including Grok 4.6, Grok 4.5, and Grok 4.20. The score identifies AI-writing signals; it does not prove which exact model generated the text.

Yes. You can also submit output from earlier Grok models. Because model behavior and human editing can change the final writing, review the sentence highlights and context rather than relying on the model name alone.

It evaluates patterns across the submitted text and returns AI, mixed, and human probabilities. For a deeper explanation of the scoring approach, read <a href="/blog/how-do-ai-detectors-work">how AI detectors work</a>.

Yes. Upload a DOCX, PDF, or TXT file, or paste text directly into the input box.

You can check short text, but a brief post gives the detector fewer sentence and structure patterns to evaluate. When possible, include the complete post, thread, or surrounding passage.

AI indicates stronger machine-writing signals, mixed points to blended or edited passages, and human indicates fewer AI-like patterns. Read the highlights with the percentages rather than treating one number as a final verdict.

Any AI detector can produce false positives, especially on rigid, formulaic, or very short writing. Compare flagged passages with drafts, sources, and prior writing; see the guide to <a href="/blog/ai-detection-false-positives">AI detection false positives</a> for a fuller review process.

No. This is a Grok AI writing detector for text. Use the separate <a href="/ai-image-detector">AI image detector</a> when you need to evaluate an image rather than written content.

No. Your pasted text and uploaded documents are processed for detection and are not used to train AI models.

Review the highlighted sentences, confirm the sources and disclosure requirements, and revise only the passages that need work. If the goal is to make an AI-assisted draft read more naturally, continue with the <a href="/ai-humanizer">AI Humanizer</a>.

Learn More About AI Text Detection

Understand detector scores, false positives, and the evidence to review before making a decision about Grok-generated writing.

How Do AI Detectors Work? The Science Behind AI Text Analysis

Are AI Detectors Accurate? The Truth About Reliability & False Positives

AI Detection False Positives: Causes, Tools, and How to Avoid Them