GPTZero vs Turnitin
GPTZero is the better detector for checking someone else's essay: anyone can sign up for it, and its sentence highlights show what drove a score. False alarms on human writing in run RUN-2026-11-A: GPTZero 0 of 100, Turnitin Test in progress.
Tested: In progress since 9 November 2026. Page updated: .
Short answer
Verdict: GPTZero. Anyone can sign up for it, and its sentence highlights show what drove a score.
Run RUN-2026-11-A started on 9 November 2026 and is in progress: GPTZero and Originality.ai are scored on the first 120 samples, and every other tool shows a test in progress tag until its readings are in.
Turnitin is the tool many schools already pay for, built into their learning platform. Treat any flag from either tool as a question, not an answer.
See them side by sideBoth readings on one essayDownload the raw files
Side by side
The same fields for both tools, from the same run.
| Field | Edge | ||
|---|---|---|---|
| Access | Web, browser extension and API | Through a school licence and its learning platform | GPTZero |
| Price | CA$25.99 a monthChecked on | Sold to institutions onlyChecked on | Even |
| False alarms on human writing | 0 of 100 | Test in progress | Test in progress |
| Detection on AI text | 20 of 20 | Test in progress | Test in progress |
| Report detail | Sentence highlights | Instructor report | GPTZero |
Which is more accurate?
Accuracy here means both halves: AI text caught, and human writing left alone.
The real difference is access. Turnitin states that its false positive rate is "less than 1% for a document with over 20% likely AI-generated content", and it sells only to institutions. GPTZero is open to anyone. In the independent test by Perkins and colleagues (2024), both were among seven detectors whose accuracy fell sharply on AI text that had been deliberately altered.
One student essay, the two tools scored so far
Sample H-002 · student essay, written without AI · run RUN-2026-11-A · GPTZero and Turnitin readings are added when the run scores both
GZGPTZero
OAOriginality.aiWhile the idea of having a fully-autonomous is very real, scientists are still very far from it. Research is being conducted every day to improve the efficeincy and safefty of these new semi-autonomous vehicles. In my opinion, driverless cars are inevitable and I would not doubt that I will end up seeing one in my lifetime. But as of right now, cars can't do as much as scientists are hoping for in the future. With that being said, I will there will be a more positive outcome of driverless cars than negative.
Ch. 10% AICh. 22% AIMany skeptics say dirverless cars will never be possible. But, what they don't realize is that we are closer than we ever have been before regardless of how much research is still necessary to succesfully make a fully autonomous car. Google's concept car has been able to drive over half a million miles without a crash. Their car still requires a driver, but it is only for more advanced tasks such as traffic issues or roadwork. Other companies have also attempted to create a driverless concept car and the concepts have showed potential. They are far from driverless but they are going in the right direction. BMW announced that their car could handle driving speeds of up 25 mph but still require the focus of a human being behind the wheel.
Ch. 10% AICh. 22% AIWhile I am very supportive of driverless cars, I think there will always be flaws, no matter the size. I think there will always be malfunctions but that does not mean that those can be fixed either. The research that has been put into these vehicles have been very strenuous and have proven that there will never not be flaws in creating an autonomous car. They still may crash but the probability of a fatal crash in a driverless is much lower than the probability of a fatal crash due to human error. Humans get distracted thus creating more chances for an accident to occur. With driverless cars, there is no chance of human error or the car getting distracted because driving is what it was built for.
Ch. 10% AICh. 22% AIThere are not many current laws or regulations on autonomous cars, so even if Google or BMW were to finish research and create a flawless and driverless car, they wouldn't be able to manufacture them on a commercial level. This is because there wouldn't be any laws covering liability in the case of an accident, if an accident were to somehow occur. It is undetermined who would be at fault for the accident according to the state. I think the company should be more at fault, considering they are advertising these cars as "driverless".
Ch. 10% AICh. 22% AIWith my opinion on driverless cars being said, I still think they are a good idea and will benefit society in the long run and keep more people safe. There are bumps in the road regarding laws and the time it will take to get to where big name companies want to be. But, if we are all patient and let scientists conduct quality research, I see a bright future for fully autonomous cars.
Ch. 10% AICh. 23% AIScroll the chart sideways to read every paragraph.
| Subset | GPTZero | Turnitin |
|---|---|---|
| Student essays (60) | 0 of 60 | Test in progress |
| Non-native English essays (20) | 0 of 20 | Test in progress |
| Professional prose (20) | 0 of 20 | Test in progress |
| Raw AI text | 20 of 20 | Test in progress |
| Human-edited AI text (20) | Test in progress | Test in progress |
Access and price
What you can do without paying, what paying adds, and when we checked.
GZGPTZero
- Free plan
- Yes, with an account
- Free word limit
- 10,000 words a month
- Paid plan
- CA$25.99 a month
- Words per scan, paid
- 300,000 words a month (Premium)
- Batch upload
- Up to 3 files on the free plan
- School plans
- Yes
Checked on
TITurnitin
- Free plan
- No
- Free word limit
- None for individuals
- Paid plan
- Sold to institutions only
- Words per scan, paid
- Set by the institution's licence
- Batch upload
- Through the learning platform
- School plans
- Institutions only
Checked on
Reports
A score you cannot inspect is hard to act on. What matters is whether the report shows which sentences drove the number, so you can read them yourself.
GPTZero scores each paragraph and highlights sentences. ZeroGPT gives one percentage for the whole text with highlights, which makes a single formal paragraph harder to spot.
| Report shows | GPTZero | Turnitin |
|---|---|---|
| Report style | Sentence highlights | Instructor report |
| Who can sign up | Anyone | Through a school licence |
Which should you use?
The same two tools, a different answer for each reader.
Teachers with a licence
TITurnitinAlready in your platform; open the full report, not only the percentage.
Teachers without one
GZGPTZeroOpen to anyone, with sentence highlights.
Students
GZGPTZeroYou cannot buy Turnitin; GPTZero shows which sentences a teacher's tool reacts to.
Departments choosing
TITurnitinIf the licence exists, one shared tool beats two.
Three alternatives
If neither fits, these are the next detectors to try, from the same run.
No detector score should be the only evidence in a misconduct case.
Questions
Is GPTZero more accurate than Turnitin?
In run RUN-2026-11-A so far, GPTZero flagged 0 of 100 human texts as AI. Turnitin is read through an institutional account and its readings are in progress; Turnitin states a false positive rate under 1% for documents with over 20% AI content.
Can students use Turnitin's AI detector?
Not directly. Turnitin says it sells only to institutions; students see results only if their teacher turns the AI report on.
Does Turnitin use GPTZero?
No. They are separate products from separate companies with their own models.
Related reading
Copyleaks vs Turnitin: AI Detection ComparedVerdict for each type of user.
Best AI Checker Like Turnitin for Students and StaffFor people without a Turnitin licence.
Turnitin Alternatives for AI Detection (2026)For people and schools without a licence.
AI Detector Comparisons: Head-to-Head ResultsTwo detectors, the same samples. Each comparison sets both readings over one.