As we all know, ZeroGPT is used by many to detect AI content. However, is it the same for Gemini? The short answer is YES. The longer answer is the devil lies in the details. Keep reading to know more about it.
Why ZeroGPT detects Gemini?
The simple answer is just like any other AI detector ZeroGPT is not made specifically to bypass Gemini outputs. Instead, it tries to flag all generative models. It is fairly effective at doing so. However, it can still produce a few false negatives and false positives here and there. Hence, if it is not made to accomplish 100 % detection of every Gemini model it won't be able to do it all the time.
We also did a post discussing ZeroGPT's effectiveness against Gemini Advanced you can check that out too.
How well does ZeroGPT spot Gemini-generated text?
Below is a table that shows the results:
| Model variant | n texts | Mean score (%) | Median | Detection ≥ 60 % |
|---|---|---|---|---|
| gemini‑2.5‑flash | 50 | 90.0 | 95.5 | 92 % |
| gemini‑2.5‑pro | 55 | 80.8 | 89.3 | 83.6 % |
| Overall | 105 | 85.1 | 92.0 | 87.6 % |
Keep reading to know more about the nitty-gritty details.
Key Points & Observations
- High average scores – Gemini outputs often get ZeroGPT “AI-content” scores well above 60 %. In fact, they mostly cluster around 90 % for the lighter gemini‑2.5‑flash model. This is why many people think ZeroGPT can easily detect Gemini.
- Flash vs Pro – The gemini‑2.5‑flash variant is flagged more reliably (92 % detection rate vs 84 % for gemini‑2.5‑pro). Possibly, flash is not as “humanized” as pro so it is easier for ZeroGPT to catch it.
- Long tail of misses – A handful of gemini‑2.5‑pro passages are in the 20–40 % range. These would slip past ZeroGPT because they are below the 60 % cut-off. Hence, if you rely only on ZeroGPT, it might fail roughly 1 in 6 Gemini texts.
- Visual evidence – When you look at the histogram of detection scores, you see a sharp peak between 85 % and 100 %, with very few below 50 %. The box‑plot also shows the difference between flash and pro, with the dashed line at 60 % signifying ZeroGPT’s “AI” threshold. Anything that crosses that line is flagged.
If you are a student then you might also be interested in how Gemini performs against Turnitin's AI detector.
Is ZeroGPT “reliable” for Gemini content?
One might say that ZeroGPT is a good first-pass filter for Gemini text since it can catch around ~88 % of them. However, do note that there is a ~12 % miss rate. That means it’s not bullet-proof, just like any other AI detector. If you need high certainty (for example, academic checks), you might want to combine ZeroGPT with other AI detectors or stylometric methods.
Opinion (The Bottom Line)
ZeroGPT is absolutely a solid tool to automatically flag Gemini‑generated text, but it’s not a foolproof solution. There will be times when it might give you a false negative or false positive, especially for gemini‑2.5‑pro content. Hence, if you want the best chance of detecting Gemini text, use ZeroGPT in combination with other detectors or do your own analysis to be sure.
