Identifying the Best Undetectable AI Services


In the contemporary era of artificial intelligence, the proliferation of AI-generated content has brought forth a consequential demand for AI detection mechanisms. This research delves into the burgeoning domain of undetectable AI services, with a particular emphasis on StealthGPT, aiming to gauge its proficiency against prominent AI detectors. Utilizing a sample of 100 random textual inputs, the study evaluates outputs from StealthGPT, StealthWriter, Conch AI, and Undetectable AI against detectors such as GPTZero, Originality AI, and Copyleaks. The results unequivocally crown StealthGPT as the preeminent service, showcasing dominant performance and unmatched human-like originality across the board. The study's composite score, amalgamating scores from all detectors, further reinforces StealthGPT's supremacy. This research not only underscores the technical prowess of StealthGPT but also signifies a broader paradigm shift in AI, suggesting that the fusion of AI and content creation is poised for transformative advancements. Future avenues of research are proposed, including an exploration of StealthGPT's real-world applications and a broader array of AI detectors. The paper concludes with actionable recommendations for users, developers, stakeholders, and AI detector services, emphasizing the importance of ethics, innovation, and collaboration in this rapidly evolving field.


In recent years, the intersection of artificial intelligence and content creation has become a prominent frontier of technological advancement. Since November of 2022, the rise of platforms such as ChatGPT has highlighted this synergy, witnessing a remarkable growth with over 100 million users joining the platform. This surge indicates that a significant volume of global content, whether in the form of academic articles, blog posts, or social media updates, is now either authored by AI or crafted with its assistance.The widespread adoption of AI for content creation has precipitated the emergence of AI detectors. Originally developed for academic institutions to identify machine-generated content in research and assignments, these detectors have found applications beyond the academic realm. From the gaming industry to the intricate processes of job recruitment, and even in the algorithms powering search engines, the ability to discern between human and AI-generated content has become a valuable asset.
However, as with any technological advancement, a counter-movement has emerged. In the wake of AI detectors, a new breed of services has arisen: undetectable AI platforms. Pioneers in this space, such as StealthGPT, UndetectableAI, ConchAI, and StealthWriter, harness the power of advanced algorithms to generate or rephrase content, aiming to outsmart AI detectors. This evolving dynamic has sparked a digital "cat and mouse" game, with each side continuously innovating to gain the upper hand.
The primary objective of this paper is to delve into this intricate dance of detection and deception. We aim to examine the leading AI detection services juxtaposed against the top undetectable AI services to determine which of the latter stands out as the most adept at evading detection. While we may infer the efficacy of certain AI detectors based on our findings, it is essential to note that the core focus of this paper remains on evaluating the prowess of undetectable AI platforms.

Literature Review

The exponential growth and advancements in artificial intelligence have ushered in a myriad of applications and services, with content generation being at the forefront. However, the landscape of AI content detection and undetectable AI services is still nascent, with literature on the topic being relatively sparse.
Given the novelty of AI in its current state-of-the-art iteration, it's unsurprising that comprehensive studies and extensive literature regarding AI detectors and their countermeasures are lacking. While the concept of automated content detection isn't entirely new, the rise of AI-focused detectors is a recent phenomenon. A testament to this is the launch of an AI detector by Turnitin, one of the world's leading academic integrity platforms, as recently as April 2023. This underscores the infancy of the field and the paucity of academic discourse on the topic.
Within this budding space, four services have emerged as frontrunners in the undetectable AI arena: StealthGPT, StealthWriter, Conch AI, and Undetectable AI. These platforms aim to navigate the intricate landscape of AI detection, empowering users to generate or rephrase content that remains undetected. Their primary objective is to sidestep the penalties associated with AI-generated content in various spheres, be it academic submissions or other professional endeavors. As of now, their focus remains squarely on text generation, bypassing detection algorithms designed to identify machine-generated prose.
As the domain of AI detection and undetectable services continues to evolve, it is anticipated that more comprehensive studies and literature will emerge, enriching the academic discourse and providing clearer insights into the capabilities and limitations of these technologies.


Our research utilized a structured and systematic approach to evaluate the proficiency of undetectable AI services. We initiated the process by selecting 100 random textual inputs, which were then provided to each of the undetectable AI services: StealthGPT, StealthWriter, Conch AI, and Undetectable AI. These services were tasked with rephrasing the given inputs. The resulting 100 outputs from each service were subsequently subjected to analysis by each AI detector.

Metrics Utilized

To gauge the effectiveness of the undetectable services, we employed scores provided by three leading AI detectors: GPTZero, Originality AI, and Copyleaks. While these detectors offer a multitude of metrics, we handpicked specific scores that best delineated the detectability of AI-generated content:


The metric of interest was `completely_generated_prob`, representing the probability that a given document was entirely AI-generated. It spans a range from 0 to 1, with 0 indicating no AI involvement and 1 signifying complete AI authorship.

Originality AI

This detector provides two key metrics:
  • "original": This score, ranging from 0 to 1, indicates the likelihood of human authorship, with 0 suggesting no human content and 1 implying the content was entirely human-generated.
  • "ai": Serving as the converse of the `original` score, this metric also ranges from 0 to 1, where 0 indicates no AI content and 1 denotes complete AI generation.


Distinct from the other detectors, Copyleaks offers binary scores:
  • "human": A score of 1 suggests human authorship, while 0 implies AI generation.
  • "ai": This is the inverse of the `human` score.
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Composite Score Calculation

To derive a comprehensive assessment of each undetectable service's performance, we aggregated the scores from all detectors. The process involved computing the average scores for originality, copyleaks, and GPTZero for each undetectable service. Thereafter, a composite score was established, blending the strengths and weaknesses of each service against every detector, providing a holistic measure of their efficacy.


Our study embarked on a thorough examination of the proficiency of various undetectable AI services, as gauged by three prominent AI detectors: GPTZero, Originality AI, and Copyleaks. Here, we present the detailed findings:

GPTZero Scores

  • StealthGPT scored an average of 0.0693, indicating a low probability of the content being detected as AI-generated.
  • StealthWriter had a score of 0.2419, implying a higher likelihood of detection compared to StealthGPT.
  • ConchAI recorded a score of 0.4301, suggesting that its content is more prone to detection by GPTZero.
  • UndetectableAI had a score of 0.3700, positioning it between StealthWriter and ConchAI in terms of detectability.
Observation: Among the services, StealthGPT exhibited the best performance against GPTZero, generating content with the least likelihood of being flagged as AI-written.

Originality AI Scores

  • StealthGPT achieved an average score of 0.6240, signifying strong human-like content generation.
  • StealthWriter trailed with a score of 0.0458, indicating a lower resemblance to human-generated content.
  • ConchAI secured a score of 0.0741, slightly outperforming StealthWriter.
  • UndetectableAI stood out with a remarkable score of 0.6706, suggesting a high degree of original, human-like content.
Observation: UndetectableAI emerged as the top performer for Originality AI, closely followed by StealthGPT, both indicating strong human-likeness in their content.

Copyleaks Scores

  • StealthGPT garnered a score of 0.8878, emphasizing its capability to generate content that Copyleaks detects as human-authored.
  • StealthWriter followed closely with a score of 0.8270.
  • ConchAI, with a score of 0.5361, lagged behind the former two.
  • UndetectableAI achieved a score of 0.6546, placing it between ConchAI and StealthWriter.
Observation: StealthGPT once again led the pack, producing content that Copyleaks most frequently identified as human-written.

Composite Score

To derive a holistic assessment of each undetectable service's capability across all detectors, we introduced the composite score. Defined as the sum of the average scores on Originality AI and Copyleaks, minus the average score on GPTZero, this score provides a balanced representation of each service's strengths and weaknesses.
Based on the composite scores:
  • StealthGPT emerged superior with a composite score of 1.4425.
  • StealthWriter followed with 0.6309.
  • ConchAI recorded 0.1800.
  • UndetectableAI secured a score of 0.9552.

AI Detection Score

Based on the calculated efficacies:

  • GPTZero has an average efficacy of 0.7222.
  • Originality AI has an average efficacy of 0.3536.
  • Copyleaks has an average efficacy of 0.7264.
Final Observation: Among the evaluated undetectable AI services, StealthGPT consistently showcased dominant performance, excelling across individual detectors and achieving the highest composite score. Its proficiency in generating content that evades detection and mirrors human-like originality positions it as the preeminent service in the realm of undetectable AI platforms.


The objective of our research was to discern the efficacy of various undetectable AI services in evading detection from leading AI detectors. The results provide a clear landscape of the current capabilities of these services, with StealthGPT distinctly emerging as the frontrunner.

Interpretation of Results

StealthGPT's consistent high performance across all detectors underscores its advanced algorithms and methodologies. Its low score on GPTZero indicates the service's adeptness at generating content that closely mirrors human writing. Furthermore, its strong showing on Originality AI and Copyleaks cements its position as a tool that not only evades AI detection but does so while maintaining a high degree of human-like originality.

StealthGPT's Superiority

Several factors could contribute to StealthGPT's superior performance. It may employ more refined training data, advanced rephrasing algorithms, or perhaps a deeper understanding of the intricacies of the detectors it's designed to bypass. The exact proprietary techniques remain a subject for further investigation, but what's evident is its effectiveness in its intended purpose.

Implications for Users

For users of text generation services, especially those in academia or professional realms where the distinction between human and AI-generated content is crucial, StealthGPT offers a reliable option. Its ability to produce content that is both original and undetectable can prove invaluable in contexts where AI-generated content might be penalized or frowned upon. However, it's crucial for users to understand the ethical implications and potential consequences of using such services, especially in academic or journalistic settings.

Efficacy of AI Detectors

Originality AI is the closest to its ideal outcome, making it the most effective detector at recognizing AI-generated content as less human-like. GPTZero and Copyleaks are comparably effective, but GPTZero is slightly more effective than Copyleaks at detecting AI-generated content. Hence, among the three detectors, Originality AI proves to be the most effective at differentiating between human-generated and AI-generated content based on the tested undetectable services.

Limitations & Biases

  • Affiliation with StealthGPT: This research was spearheaded by the StealthGPT team. Despite our rigorous efforts to maintain objectivity and impartiality, our inherent association with StealthGPT makes it crucial to declare potential biases. It's imperative to emphasize that we did not modify the data collected from each service, preserving its original form. Service providers are encouraged to independently verify the authenticity and integrity of the data we've analyzed.
  • Financial Constraints: Conducting this research involved significant costs, including fees for API access to various undetectable and detection services. This financial constraint was a pivotal factor in our decision to test only 100 samples from each service.
  • Manual Data Retrieval: Two of the AI services, ConchAI and StealthWriter, currently lack API functionality. This meant each output had to be manually retrieved and recorded, making the data collection process tedious and time-consuming.
  • Choice of Detectors: The selection of only three detectors may not encompass the complete spectrum of AI detection capabilities available in the market. This choice may have influenced the results and their interpretation.
  • Sample Size: Our choice to analyze only 100 random inputs from each service can introduce potential biases. Different inputs or a larger sample size might yield varied results.
  • Evolving AI Landscape: The world of AI is in constant flux. Both detectors and undetectable platforms are perennially innovating, which means the performance dynamics of these services could alter in the future.
Lastly, to foster transparency and encourage further research, we've provided a link to our GitHub testing repository within this paper. Researchers and enthusiasts are free to conduct additional testing against all services. However, it's noteworthy that services without API access will require manual data collection.


Our research embarked on an intricate journey through the landscape of undetectable AI services, evaluating their proficiency against leading AI detectors. The empirical findings have delivered a clear message: StealthGPT stands out as the pinnacle of undetectable AI services in the current ecosystem. Its consistent high performance across GPTZero, Originality AI, and Copyleaks accentuates its superior algorithms and methodologies. The composite score, a holistic metric incorporating scores from all three detectors, further attested to StealthGPT's dominance in the realm of undetectable AI platforms.The robustness of StealthGPT isn't merely a testament to its technical prowess but also hints at a broader shift in the AI paradigm. As AI continues to weave itself into the fabric of daily life, the demand for undetectable content generation that mirrors human-like originality will likely soar. This research lays a foundational stone in understanding the current capabilities of such services, with StealthGPT leading the charge.
For future research endeavors, it would be intriguing to delve deeper into the real-world applications of StealthGPT, understanding its impact across various domains. Additionally, exploring other metrics or incorporating a wider array of AI detectors might offer a more nuanced perspective on the capabilities of undetectable AI services.


  • For Users: Given StealthGPT's demonstrated superiority, individuals seeking AI-generated content that evades detection should consider leveraging its capabilities. However, users must exercise discretion, especially in settings where the authenticity of content is paramount, such as academia or journalism. Understanding the ethical ramifications and potential consequences of using AI-generated content is crucial.
  • For Developers: The findings emphasize the importance of continuous innovation in the field of AI text generation. Developers should focus on refining algorithms, expanding training datasets, and staying abreast of advancements in AI detection mechanisms to ensure their platforms remain effective and relevant.
  • For Stakeholders: The rise of undetectable AI services like StealthGPT signals a broader shift in the AI landscape. Stakeholders, especially in sectors like education, journalism, and content creation, should be aware of these advancements and consider strategies to embrace, as appropriate.
  • For AI Detector Services: The ongoing evolution of undetectable AI platforms necessitates continuous enhancement and adaptation. Exploring collaborations, sharing insights, and perhaps even considering adversarial training might be avenues to bolster detection capabilities.