Best AI DetectorsEvery reading on the record
Subject

GPTZero vs Turnitin

Tested
In progress since 9 November 2026
Updated
November 9, 2026

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

Two reports side by side on chart paper
Two reports side by side on chart paper.

Side by side

The same fields for both tools, from the same run.

Prices and limits as checked on the date shown. Counts are out of the real sample set: 100 human samples, 80 AI samples.
FieldGPTZeroTurnitinEdge
AccessWeb, browser extension and APIThrough a school licence and its learning platformGPTZero
PriceCA$25.99 a monthChecked on Sold to institutions onlyChecked on Even
False alarms on human writing0 of 100Test in progressTest in progress
Detection on AI text20 of 20Test in progressTest in progress
Report detailSentence highlightsInstructor reportGPTZero

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

Ch. 1GPTZero
Scored human on every paragraph
Ch. 2Originality.ai
Scored human on every paragraph
Text as scored
P1

While 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% AI
P2

Many 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% AI
P3

While 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% AI
P4

There 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% AI
P5

With 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% AI
GPTZero readingEach tool's flag lineZeroGPT readingFalse alarm: human writing scored as AI

Scroll the chart sideways to read every paragraph.

SubsetGPTZeroTurnitin
Student essays (60)0 of 60Test in progress
Non-native English essays (20)0 of 20Test in progress
Professional prose (20)0 of 20Test in progress
Raw AI text20 of 20Test in progress
Human-edited AI text (20)Test in progressTest in progress

Access and price

What you can do without paying, what paying adds, and when we checked.

GPTZero

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

Turnitin

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.

Checked on the free plan and the cheapest paid plan, 8 November 2026.
Report showsGPTZeroTurnitin
Report styleSentence highlightsInstructor report
Who can sign upAnyoneThrough a school licence

Which should you use?

The same two tools, a different answer for each reader.

  • Teachers with a licence

    Turnitin

    Already in your platform; open the full report, not only the percentage.

  • Teachers without one

    GPTZero

    Open to anyone, with sentence highlights.

  • Students

    GPTZero

    You cannot buy Turnitin; GPTZero shows which sentences a teacher's tool reacts to.

  • Departments choosing

    Turnitin

    If the licence exists, one shared tool beats two.

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.