You send a text, the API flags every suspicious sentence. In twelve languages, in seconds, from €0.05 per 1,000 words.
AI Detector API: detect AI-written text right inside your software
curl https://api.mimir-mentor.com/v1/ai-detection \
-H "x-api-key: $MIMIR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"text": "Your text …", "language": "en"}'10,000 words free · no payment details
- 🎯 Every sentence rated on its own
- 🌍 Twelve languages, each calibrated
- ⚡ 2 to 3 seconds per 1,000 words
- 🇩🇪 Servers in Germany
- 🔒 Texts are never stored
Used by more than 70,000 students 🎉
What you get back
A verdict, the AI share and every flagged passage with its position and level. Enough to highlight the sentences right in your interface.
88% A large part is probably AI-generated.
Digitalization has fundamentally transformed nearly every aspect of modern society in recent years. In the field of education in particular, it opens up a wide range of new opportunities that benefit both teachers and learners. Digital tools make it possible to deliver learning content in a flexible and individualized way, allowing different learning styles to be supported effectively. Furthermore, fostering digital literacy plays a crucial role in preparing students for the demands of the modern workplace. …
very likely AIlikely AIpossibly AI
{
"verdict": "mostly",
"ai_share": 0.8776,
"result_message": "A large part is probably AI-generated.",
"sentences": [
{
"start": 0,
"end": 99,
"band": "possibly_ai"
},
{
"start": 100,
"end": 227,
"band": "likely_ai"
},
…
]
}Real result of the model for an AI sample text, shortened.
Ready in three steps
What you can build
Check submissions automatically
Learning platforms and university software show teachers the AI share of every paper and exactly the sentences that stand out, not just a percentage.
Assess texts before the job
Editing and proofreading services see with the request which passages were probably written by AI, and quote the job accordingly.
Check contributions before publishing
Publishers, newsrooms and agencies check submitted texts within their own workflow: one call per piece, the result within seconds.
Your first 10,000 words are free.
Pricing
Test
€0
10,000 words, one time
- all features of the API
- no payment details
- test key by email
Starter
€39 per month
500,000 words included
- then €0.09 per 1,000 words
- about 625 articles or 125 term papers a month
- cancel monthly
Best price per word
Business
€129 per month
3 million words included
- then €0.05 per 1,000 words
- about 3,750 articles or 750 term papers a month
- cancel monthly
What does one check cost? An article of 800 words costs about €0.06 on Starter, a term paper of 4,000 words about €0.31. On Business it is about €0.03 and €0.17.
Prices exclude VAT. More than 3 million words a month, or use at a university: info@mimir-mentor.com.
Get your test key
Your API key, right in your Mimir account
Sign in, answer three short questions, see your key right away.
Until then we send you a test key by email: just leave your address below.
Want to start earlier or get notified? Leave your email address and we will get back to you with your test key.
Why the Mimir API
- Sentence by sentence. Every flagged passage comes with position and level, ready to highlight.
- Strict on false alarms. None of 481 human-written texts was flagged.1
- Twelve languages. From English and German to Finnish and Turkish, each calibrated on its own.
- Servers in Germany. Your text is never stored and never used for training.
- Predictable costs. A cost cap per key, and only a finished result is billed.
- Proven in use. The same model checks theses every day in Mimir Mentor’s document scan.
Who is behind the API
Mimir Mentor is based in Mainz, Germany, and used by more than 70,000 students. We developed and trained the model ourselves.
We trained and tested it with texts from current models by OpenAI, Anthropic and Google and from open models, as well as with human-written texts from academia, the web, the press and everyday life. When a new model comes out, we measure again.
API questions and answers
From 16 Nov 2026 you create it right in your Mimir account: sign in, answer three short questions, and the key is shown right away. An account is free. Until then, leave your address in the form and we send you a test key by email. It checks 10,000 words and can do everything the paid plans can.
Write to info@mimir-mentor.com or reply to the email with your key. You get an order link and pay monthly through Stripe.
Extra usage then counts per 1,000 words. Every key has a cost cap of €200 per month; once it is reached, the API stops instead of charging more. We adjust the cap on request.
The model is tuned strictly so that human writing is not flagged by mistake: in our test of November 2026, none of 481 human-written texts was flagged. Pure AI text is detected reliably; in heavily edited or mixed texts it does not find every passage. A flag is a hint, not proof.
Running text of 80 words or more in twelve languages: articles, blog posts, marketing and press copy and reviews as well as term papers and theses. The model is most accurate on academic texts, where we have measured the most.
No. The text is processed for the check only and then discarded. Our logs hold numbers such as word count and duration.
The full report with plagiarism, sources and proofreading currently runs in our app. If you need it as an API, get in touch.
1 Own test, November 2026: 481 human-written texts in several languages, none of them was flagged. The error rate can differ for other kinds of text.