Jun 17, 2024

Gltr AI Checker Review: Is It Gltr.io Good Enough?

Vaishnavi Ramkumar
Gltr AI Checker Review: Is It Gltr.io Good Enough?
Vaishnavi Ramkumar
Jun 17, 2024

Gltr AI Checker Review: Is It Gltr.io Good Enough?

Get insights into Gltr.Io AI Content Detection with our comprehensive review of the gltr ai checker for accurate content analysis.
Gltr AI Checker Review: Is It Gltr.io Good Enough?

Table of contents

In our increasingly digital world, distinguishing between human-generated and AI-generated text has become a growing concern. With advancements in artificial intelligence, large language models have emerged that can generate text bearing an uncanny similarity to human-written content.

To combat the potential pitfalls of this technology, tools like Gltr.io, created by Hendrik Strobelt and Sebastian Gehrmann from the MIT-IBM Watson AI lab and HarvardNLP, have come to the fore. Designed to detect automatically generated text, Gltr.io uses forensic text analysis to analyze the visual footprint of text and determine the likelihood of it being generated by an automatic system. 

Platforms like Facebook and YouTube have already recognized the value of utilizing resources like Wikipedia to combat fake news and fake reviews with the help of tools like Gltr.io, which can be accessed through a live demo and the source code is available on Github. Researchers can also read the ACL 2019 demo track paper, which was nominated for best demo.

By leveraging the GPT-2 117M language model from OpenAI, it computes the ranking of possible following words, providing a necessary check against the misuse of AI technology in generating misleading or false information. Using tools like Gltr.io can also improve your website's SEO score by ensuring that your content is human-generated and not flagged by search engines as low-quality or spam.

Overview of Gltr AI Checker

Gltr ai checker 

Gltr.io, an abbreviation for Giant Language Model Test Room, is a powerful tool for detecting AI-generated text. It utilizes language models like GPT-2 117M from OpenAI to analyze textual inputs and assign a probability level to each word based on the likelihood of its production by an AI model. 

The tool employs this technique to differentiate between human-written and machine-generated content, thus enhancing the credibility of digital information and promoting the responsible use of AI in text generation.

Gltr AI Detection Features

Gltr.io boasts several unique features that make it an effective tool for detecting AI content. Have a look at the key features of the Gltr AI tool:

Automatic Text Generation Detection

Automatic text generation in Gltr

One of the most important capabilities of the Gltr AI detector is its automatic text generation detection function. With the proliferation of AI-generated text, the tool stands as a guard against the potential misuse of AI in generating misleading or false content. This detection is carried out through the use of forensic analysis, which inspects the likelihood of each word in a text being generated by an AI model

The higher the likelihood score, the more probable it is that the word was produced by a machine. By analyzing this score throughout an entire document, Gltr.io can assess whether the text is human or AI-generated, making it an essential tool in the fight against fake news and misinformation in news articles.

GPT-2 117M Language Model

Gltr.io makes extensive use of the GPT-2 117M language model from OpenAI in its operation. 

GPT-2, short for Generative Pretrained Transformer 2, is one of the largest publicly available models, renowned for its capability to generate coherent and contextually relevant sentences by predicting the following words in a given input of context. 

In the context of Gltr.io, GPT-2 is used as the benchmark for assessing the likelihood of word generation in a text. By analyzing the text against the language patterns produced by the GPT-2 model, Gltr.io can compare and rank each word according to its probability, thereby aiding in the detection of AI-generated text.

Ranking of Words

Ranking of words in Gltr AI 

Another significant feature of Gltr.io is the ranking of words based on their likelihood of being generated by an AI model. This is facilitated by the color-coded system, which visualizes the ranking of words.

This color-coding system provides users with a clear visual representation of the blend of human and machine language in a text, thus enhancing their ability to detect and understand AI-generated content.

Baseline Statistical Methods

Statistical method in Gltr

In order to further aid the detection of generation artifacts, Gltr.io employs baseline statistical methods across common sampling schemes. This involves the use of various statistical models to analyze the probability distributions of words within a text.

 For instance, the tool presents three histograms that aggregate data over the entire content, providing insights into the characteristics of the text, such as the prevalence of most likely words, the ratio between the probabilities of the top-predicted word and the subsequent word, and the distribution over the entropies of the predictions. 

These advanced statistical methods facilitate a more nuanced and comprehensive analysis of potential AI-generated text, improving the precision and reliability of Gltr.io's detection capabilities and pricing options.

Also Read: Gemini AI vs ChatGPT

How Gltr.io Works?

Gltr.io functions by inspecting a text and computing the ranking of observed following words based on their likelihood of being produced by the GPT-2 117M language model. Words are then highlighted according to their ranks - green for most likely, yellow for somewhat likely, red for less likely, and purple for least likely words. 

It displays histograms that aggregate information over the complete text, providing further visual evidence of whether a text is machine-generated. 

This blend of computational linguistics and visual forensics allows Gltr.io to detect artificially written text with direct visual indication and remarkable precision.

What is the employed detection process?

The detection process employed by Gltr.io begins with analyzing the input text. Using the GPT-2 117M language model, the software determines the likelihood of each subsequent word in the text being generated by the model. 

These likelihoods are then translated into color-coded representations, wherein most likely words are highlighted in green, somewhat likely words in yellow, less likely words in red, and the least likely words in purple. 

By overlaying this mixture of colors and histograms over the input text, Gltr.io provides a visually rich footprint of the likelihood of the text being artificially generated, ensuring a comprehensive evaluation process.

Analyzing Language Model Outputs

Understanding and analyzing the outputs of language models is an intrinsic part of how Gltr.io operates. It executes this in two main steps:

i) Compute the likelihoods: Using the GPT-2 117M language model, Gltr.io calculates the likelihood of each word in the text being generated by an AI model.

ii) Visualize the data: Gltr.io then visualizes the computed data using a color-coded system where each color represents a different likelihood range.

Analyzing language model outputs in this way helps users understand and identify possible AI-generated text within a document.

Gltr.io Pros and Cons

In the following sections, we analyze Gltr.io’s pros and cons in detail to appreciate its scope and understand its potential drawbacks.

Gltr AI Checker Pros

Gltr.io offers several advantages as an AI content detection tool:

  • Comprehensive Detection: It can effectively detect and differentiate between human-written and AI-generated text using forensic analysis of language patterns.
  • Use of Advanced Language Model: Gltr.io employs one of the largest publicly available language models, GPT-2 117M, further escalating its effective detection scores.
  • Visualization: The text analysis is presented visually, helping users easily distinguish between machine-generated and human-written text.
  • Analyzing Language Model Outputs: Its ability to compute the likelihood of words being AI-produced and visualize them enables detailed analysis of language patterns.
  • Free to Use: Gltr.io currently does not cost anything, which makes it an accessible tool for many.

These positive aspects can help uphold the authenticity of digital content and safeguard against potential misuse of AI technology.

Gltr AI Checker Cons

Despite Gltr.io's strengths, it also has a few limitations:

  • User-Friendliness: The results can be difficult to interpret for non-tech savvy individuals owing to the complex mechanism of operation.
  • Lack of extra features: Unlike other similar platforms, Gltr.io does not offer additional features such as detecting text generated by specific models or API integration.
  • Manual Detection: As it currently operates, the detection process demands manual input, making it potentially laborious with large-scale texts.
  • Unable to Detect GPT-3 Texts: Gltr.io is limited to the GPT-2 117M language model and cannot detect texts generated by the GPT-3 model, which is the most powerful variant available.

Comparison with Other AI Content Detection Tools: Gltr.io Ai Checker Alternatives

While Gltr.io provides valuable services as an AI content detection tool, other platforms in the market offer similar features with varied degrees of success. Here are they:

Scalenut AI Detector

Scalenut AI detector 

Scalenut AI Detector is a free ChatGPT Content AI Detector that emerges as an exemplary AI Detector for its high accuracy. It has stood out consistently for its excellent processing speed, highlighting areas of the text that are considered as AI generated

The distinguishing feature of Scalenut is that it can differentiate between AI-generated, human, and mixed (AI+Human) content, which makes its results considerably reliable.

Scalenut is fairly easy to use. You don’t need to sign up for your free account here. Copy and paste the text in the box and click on ‘Scan for AI content’.  The impressive aspect of this tool is its flexibility in handling enormous lengths of text. 

Once you have detected the content, you can use the Rewrite & Humanize feature to humanize the AI text completely. The tool offers unlimited scans with high precision. 

Nightfall for ChatGPT Extension

Nightfall AI detection engine 

Nightfall for ChatGPT Extension is another AI content detection tool that operates as a browser extension. Like Gltr.io, its primary function is to monitor text input and identify possible instances of AI-generated content. However, unlike Gltr.io, Nightfall is not solely reliant on assessing textual patterns but employs comprehensive data loss prevention mechanisms. It includes an advanced inspection tool that scans files for sensitive data, providing added protection against the misuse of AI to create misleading or inappropriate content. Nightfall provides automatic updates to its clients, ensuring they always have access to the latest versions of its detection software. While Gltr.io does offer powerful text analysis features, Nightfall's extra layers of data protection give it an advantage in safeguarding digital content.



Another comparable platform to Gltr.io is Originality.ai. This platform focuses on checking the originality and authenticity of AI-written content through its web-based app. It also incorporates plagiarism-checking functionality, which gives it an added edge over platforms like Gltr.io, which focuses solely on the detection of AI-generated content. The platform uses Natural Language Processing (NLP) techniques to analyze text, comparing patterns in the provided text with those of known AI models to discern whether the text was likely written by a machine.



Writer.com  is another tool in the AI content detection niche. While it also focuses on identifying AI-generated content, what sets it apart is that it provides detailed reports of the analysis process and the text's score against several machine learning models. This aids in understanding the probability of the text being machine-generated more comprehensively. However, unlike Gltr.io, which provides visual representation through color-coding and histograms,Writer.com provides results in a more conventional report format. 


In conclusion, Gltr.io emerges as a powerful tool in the fight against the misuse of AI technology to generate misleading or false content. Its unique combination of forensic text analysis, advanced language model utilization, word-ranking capability, and effective visualization techniques caters to a diverse spectrum of use cases, ranging from journalism and social media to academia. While it does have certain limitations, such as its complex interpretation mechanism and inability to detect GPT-3 generated text currently, its benefits outweigh its shortcomings.

Frequently Asked Questions

How does Gltr.io detect automated text generation?

Gltr.io detects automated text generation by employing forensic analysis on text. Analyzing textual input using the GPT-2 117M language model and computing the ranking of the following words observed identifies generation artifacts that help detect AI-generated text.

What language model does Gltr.io use?

Gltr.io employs one of the largest publicly available language models, GPT-2 117M developed by OpenAI. This model aids in predicting the likelihood of each word being produced by an AI, helping Gltr.io differentiate between AI-generated and human-written text.

What are the limitations of Gltr.io?

Some limitations of Gltr.io include its complex interpretation mechanism which may not be user-friendly for non-tech savvy individuals, and its inability to detect texts generated by GPT-3, the latest and most powerful AI language model available.

Is Gltr.io free to use?

Yes, currently Gltr.io is in demo testing and hence, it is free to use. However, this status may change in the future as the platform continues to evolve and enhance its offerings to combat the rising threat of AI-manipulated content.

Can Gltr.io detect GPT-3-generated text?

No, as of now, Gltr.io employs the GPT-2 117M language model from OpenAI and is unable to detect texts generated by the more advanced GPT-3 model. This could be considered a limitation, given GPT-3's current status as the most powerful available AI language model.

How can we know if something is written by AI?

Determining if something is written by AI can be challenging, but tools like Gltr.io use forensic analysis and language models like GPT-2 117M to detect AI-generated text. Look for inconsistencies, lack of human nuances, or overly perfect grammar as potential indicators of AI involvement in the writing process.

Vaishnavi Ramkumar
Content Marketer
ABout the AUTHOR
Vaishnavi Ramkumar
Content Marketer

Vaishnavi Ramkumar is a content marketer specializing in creating BOFU content for SaaS brands. She believes reader-centric content is the sure-shot way to generate high-quality leads through content marketing. As part of the Scalenut team, Vaishnavi curates content that drives brand awareness and boosts signups. When she's not crafting content, you can find her immersed in the pages of a good book or a course.

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