GPTZero will expand Superhuman’s authenticity layer, giving writers and readers confidence about the origin of what they’re submitting and reviewing

SAN FRANCISCO–(BUSINESS WIRE)–Superhuman, the productivity platform bringing AI to wherever people work, announced today that it has agreed to acquire GPTZero, a leading AI content detector with a comprehensive authenticity suite spanning AI and hallucination detection, plagiarism checking, AI Vision, and more. Soon, customers will have access to GPTZero in Superhuman Go, the AI assistant that works in 1 million apps and websites. Superhuman has been building the authenticity category for years — tools that verify the origin and integrity of content — and this acquisition will accelerate its reach.

“Together, we’re bringing the most trusted writing tool and the most trusted AI detector into one platform, so that confidence in content becomes the default for writers and consumers.”Share

Why it matters

AI content has flooded the internet, and knowing what’s human-created has never mattered more because people are losing trust in the content they consume every day. “AI slop” was named the “Word of the Year,” and the negative sentiment associated with the term makes it clear that people want more AI transparency. Currently, the number of articles published on the internet that are primarily AI-generated (50%) is equal to the number written by humans (50%). IsTheInternetAI.com tracks AI content across the internet in real time and predicts that, at this rate, the internet will be 100% AI in just five years.

While readers want to know the origin of what they’re consuming and its accuracy, writers and creators want to know that their work reflects their original voice. Superhuman’s authenticity tools address both sides of the equation — understanding the provenance of what they read and using AI responsibly while writing.

AI detectors on the rise

Given the influx of AI-generated content, more people are turning to authenticity tools, such as AI detectors. Grammarly’s AI detector from Superhuman is one of its fastest-growing products and is highly ranked for quality by RAID (Robust AI Detection), a rigorous evaluation system that tests how accurately AI detectors can distinguish between human- and AI-generated text. Originally popularized in education among students and educators, needs have extended into other industries such as recruiting, content publishing, and legal and compliance. The more AI is used throughout society, the greater the need for transparency in how content is created.

AI detectors, such as large language models (LLMs) from various providers, are trained on different datasets. They’re looking for the probability of AI use based on language patterns. People find that using multiple AI detectors gives them different signals about where AI may have been used. For instance, one tool might flag a sentence as AI-generated, while another does not. That’s because each was trained to recognize different patterns and models.

GPTZero’s deep specialization in detecting AI writing patterns, combined with Superhuman’s expertise in how humans actually write across 40 million daily users, can create a more complete and reliable picture of authenticity.

Building the authenticity layer

AI detection is just the starting point. In many cases, knowing whether content was AI-generated matters, but so does understanding how it was created. Grammarly tools like Authorship and GPTZero tools like Replay provide an accurate view of originality, while the two companies’ combined plagiarism-detection tools help authors avoid unintentional plagiarism. All these tools together tell the full story of the content creation journey, not just a verdict on the finished product.

AI hallucination is a well-known issue that can have real consequences. When incorrect information is included in public documents, the inaccuracies are propagated through the LLMs that continue to train on them. There have been several high-profile cases where studies were retracted after the discovery of AI hallucinations. GPTZero’s hallucination detector is designed to catch these errors by scanning content for fake citations, invented stats, and factual claims that don’t hold up, so people can verify their work before it becomes part of the public record.

GPTZero’s AI Vision, launched in February 2026, brings AI detection to the biggest platforms on the internet. As AI generation becomes faster and more accessible, the same issue of trust applies to what people see on the internet. AI Vision highlights what’s AI-generated on a user’s feed in real time, and already works on the internet’s biggest platforms for social media, email, publishing, and reviews.

The next frontier is making authenticity a seamless part of how people work and communicate. Superhuman has built the infrastructure to deliver AI directly to where people work across 1 million apps and websites. Meanwhile, GPTZero has been on a mission to create a verification layer for the world’s information — an internet where generative AI is used responsibly, properly cited, sourced, and balances what’s uniquely human. By combining Superhuman’s broad reach with GPTZero’s expertise, they can scale this authenticity layer so whether someone is writing or consuming content, confidence and trust are built in.

While the need for authenticity has grown, educators and students will remain a priority. Superhuman and GPTZero will continue to build products that help students and educators navigate what learning looks like as AI evolves and becomes an increasingly normal part of how people think, write, and learn.

Company quotes

“As part of the Superhuman AI productivity platform, we’re building an authenticity layer, and GPTZero accelerates our vision. Together, we’re bringing the most trusted writing tool and the most trusted AI detector into one platform, so that confidence in content becomes the default for writers and consumers,” said Shishir Mehrotra, CEO of Superhuman. “GPTZero has built something truly remarkable — a product people turn to when it matters most. Our goal is to put that same level of content transparency in the hands of more people wherever they already work.”

“We started GPTZero because we believed trust in content is vitally important, and that belief has only grown stronger as AI becomes ubiquitous,” said Edward Tian, Co-Founder of GPTZero. “Joining Superhuman means our tools can be there at the exact moment someone needs them, not as a separate step, but as a natural part of how people already write and read. We’re excited to continue to build toward that together.”

Learn more

• Read the Superhuman blog here and the GPTZero blog here.

Key facts

• Superhuman is acquiring GPTZero, the leading AI detection company.
• GPTZero was co-founded by Edward Tian and Alex Cui.
• GPTZero is an AI content detection and authenticity platform.
• GPTZero’s product suite includes: AI detection, hallucination detection, AI review, plagiarism checking, citation verification, AI Vision, and Replay (authorship tracking).
• GPTZero will be integrated into Superhuman Go, the AI assistant that works across 1 million apps and websites.
• Combining GPTZero’s detection with Superhuman’s writing expertise creates a more complete picture of AI usage.
• Superhuman’s AI detector is ranked No. 1 for quality by RAID (Robust AI Detection).
• Superhuman has 40 million daily active users and is available in 1 million apps and websites.
• Superhuman is building an AI productivity platform.
• GPTZero will become part of Superhuman’s authenticity layer.

FAQ

Why did Superhuman acquire GPTZero?

• Superhuman is expanding its authenticity tool set with the acquisition of GPTZero and making these tools available to more people through Go.

Will GPTZero remain a standalone product?

• People can purchase GPTZero as a standalone product, and soon it will be available to Superhuman Go customers through the Go platform.

What other authenticity tools does GPTZero make?

• GPTZero’s product suite includes: AI detection, hallucination detection, plagiarism checking, citation verification, AI Vision, and Replay (authorship tracking).

What is the authenticity layer?

• The authenticity layer is the suite of tools that provides transparency into the creation of content.

How does an AI detector work?

• AI detectors use machine learning to analyze patterns in writing to estimate how much of your work appears to be written with AI. They are trained on large datasets that include both human-written and AI-generated text, which helps them recognize differences in structure, phrasing, and predictability.

How reliable are AI detectors?

• AI detectors estimate the likelihood that text was AI-generated, but not all of them are accurate. Accuracy depends on factors like writing style, AI model complexity, and training data quality. GPTZero is well known for its accuracy, placing among the top in third-party benchmarks, as well as maintaining a false positive rate below 1% across 20 different languages.

What is plagiarism detection?

• Plagiarism detection compares text against a vast database of online sources to identify potential uncredited material.

What is Authorship?

• Grammarly Authorshiptracks how a document was created. When enabled, Authorship provides a report showing what was typed by a human, generated with AI, or pasted and edited—offering a clearer record of the writing process.

What is Superhuman Go?

• Superhuman Go is a platform and an agent. You can delegate tasks to Go or the other agents on the Go platform to help you get work done.

When will GPTZero be available in Superhuman Go?

• It’s coming soon. We’ll keep you posted on the exact date.

What is hallucination detection and why does it matter?

• GPTZero hallucination detection automatically identifies when AI-generated content contains fabricated or unsupported claims, and most commonly fake citations, so that readers and reviewers can trust what they’re reading.

What is Replay?

• Replay is GPTZero’s authorship tracking tool that records the writing process in real time, showing exactly what was typed, pasted, or AI-generated so reviewers can verify how a document was created.

What is citation verification?

• GPTZero citation verification checks whether the sources cited in a document actually exist and accurately match the claims being made, catching fabricated or misrepresented references.

What is AI Vision?

• AI Vision extends GPTZero’s detection capabilities to the biggest platforms on the internet, highlighting what’s AI-generated on users’ feeds in real time.

How is GPTZero different from other AI detectors?

• Unlike single-purpose detectors, GPTZero offers a comprehensive authenticity suite — combining AI detection, hallucination detection, plagiarism checking, citation verification, AI Vision, and authorship tracking. GPTZero is well known for its accuracy, placing among the top in third-party benchmarks, as well as maintaining a false positive rate below 1% across 20 different languages.

About Superhuman

Superhuman (formerly Grammarly) is the AI productivity platform on a mission to unlock the superhuman potential in everyone. The Superhuman suite of apps and agents brings AI wherever people work, integrating with over 1 million applications and websites. The company’s products include Grammarly’s writing assistance, Coda’s collaborative workspaces, Mail’s inbox management, and Go, the proactive AI assistant that understands context and delivers help automatically. Founded in 2009, Superhuman empowers over 40 million people, 50,000 organizations, and 3,000 educational institutions worldwide to eliminate busywork and focus on what matters. Learn more at superhuman.com.

About GPTZero

GPTZero (gptzero.me) is an AI detection platform that helps teachers, students, institutions, and professionals identify content generated by large language models (LLMs) like ChatGPT, Claude, and Gemini. The world’s first purpose-built AI Detector, GPTZero is trusted by millions of users and recognized as a leader in detection accuracy. Beyond detection, the company has expanded into a broader platform for trust and transparency online, with real-time AI content detection on social media (AI Vision), source and authorship analysis (Hallucination Detector), and a developer API.

Contacts

Sheridan Smalley
press@superhuman.com
206-948-2606

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