What is model training
Also known as: AI training, training
Definition
Model training is how an AI model learns: it sees many examples, checks its guesses against the right answers and adjusts itself until the errors shrink.
Why it matters
You will almost certainly not train a large model: the cost is far beyond a small business, which is why businesses use models someone else trained.
Common mistakes
Calling the upload of files to a chat tool training, and expecting the model itself to have learned them.
Related terms
Worked exampleIllustration
A small model learns to sort a fictional pilates studio's WhatsApp messages
A small model learns to sort a fictional neighbourhood pilates studio's WhatsApp messages into booking, cancellation and question, from 20 messages the owner labelled. Every number is invented for this example.
- 8 ÷ 20 = 40%
Guess
In the first round it sorts the 20 labelled messages and gets 8 right.
Compare
Each guess is compared with the owner's label.
- 17 ÷ 20 = 85%
Adjust
It adjusts itself and repeats. After several rounds it gets 17 of the 20 right.
- 7 ÷ 10 = 70%
Test
On 10 new messages it never saw, it gets 7 right.
The score on new messages is the one that counts. The big chat model you use was trained the same way, only by its vendor, on far more text.
Illustration
Train one round at a time
Round 6: 17 of 20 right
- Booking
- Question
- Cancel
- Booking
- Question
- Booking
- Cancel
- Question
- Booking
- Cancel
- Question
- Booking
- Question
- Cancel
- Booking
- Question
- Bookingshould be Cancel
- Booking
- Cancelshould be Question
- Bookingshould be Cancel
White line: round 1, 8 of 20
After the last round: 17 of 20 right, up from 8 in round 1. The score that counts comes next, on messages it never saw.
Trained once, used every time
Definition
Model training is how an AI model learns. It is shown a large number of examples, makes a guess for each, compares the guess with the right answer and adjusts its internal settings to be a little less wrong, round after round, until the errors stop shrinking. Large language models are trained first on vast amounts of text, learning to predict the next piece of it. The chat tool you use was trained this way by its vendor, on text up to a date, so it knows nothing after that date and nothing about your business unless you give it the information. Uploading files to a chat tool is not training: the tool searches the files, and the model stays the same.
Why it matters
Your part is different. Give the model your facts when it answers, and know whether your own conversations may be used to train the vendor's next version, which is a setting of your plan.
Directly related: Inference, AI Model, Fine-tuning.
Improvement tips
- Check your plan's setting on whether your conversations may be used to train future models, and choose on purpose.
- Give the model your business facts in its instructions or documents, since its training did not include them.
- Judge any trained model on new examples it never saw, not on the ones it learned from.
- For anything recent, give the model the source or use a tool that searches, because its knowledge stops at a date.
Common mistakes
- Judging a model by its score on the examples it was trained on.
- Assuming a trained model knows recent events or your current hours.
- Leaving the plan's training setting at its default without knowing what the default is.
Related terms
Inference
Inference is the moment a trained AI model does its job: it takes a new question and produces an answer. It happens on every request, so it is the ongoing cost.
AI Model
An AI model is the trained file at the heart of an AI tool: it takes an input, applies patterns learned from data, and returns a prediction, a label or text.
Fine-tuning
Fine-tuning is extra training of a ready AI model on your own examples, so it learns a style, format or task. It changes how it answers, not what it knows.
RAG
RAG (retrieval-augmented generation) is a method where AI answers from your documents: it first finds the relevant passages, then writes the answer from them.
Machine Learning
Machine learning is the part of AI where software learns rules from examples instead of being told them, then uses those rules to predict or sort new cases.
LLM
An LLM (large language model) is AI trained on masses of text to predict the next piece of a sentence. That is how chat tools write answers, right or wrong.
Quick check
A model sorts 17 of 20 training messages correctly and 7 of 10 new messages. Which score tells you how it will do next week?
Choose an answer
Frequently asked questions
What is model training in simple words?
What is the difference between training and inference?
Do I need to train my own model?
Is uploading my files to a chat tool training?
Why doesn't the model know about something that happened last month?
Why doesn't the model know our hours and rules?
Are my conversations used to train the AI?
Is it risky to let a vendor train on our data?
Can I train a small model myself?
Why did the model score well in testing and badly in real use?
Does training make a model always right?
What is the difference between training and fine-tuning?
Sources: Anthropic, "Models overview", Claude documentation, the rows "Reliable knowledge cutoff" and "Training data cutoff" (platform.claude.com/docs/en/about-claude/models/overview), read 2026-09-25, Anthropic Privacy Center, "Is my data used for model training?", consumer and commercial articles (privacy.claude.com), read 2026-09-25, Anthropic Help Center, "Retrieval augmented generation (RAG) for projects" (support.claude.com/en/articles/11473015), read 2026-09-25, Privacy Protection Authority, Amendment 13 questions and answers (gov.il/he/pages/tikun13_qa), read 2026-08-31
Last reviewed: 2026-09-25
I have worked with
- Google for Startups
- House of Business, Sderot Municipality
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- GameReady
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- SderoTech
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- International Resilience Institute of Sderot
- Google for Startups
- House of Business, Sderot Municipality
- Microsoft Reactor
- GameReady
- Eclipse Capital
- SderoTech
- IUCEL
- Resilience & Health Innovation Hub
- International Resilience Institute of Sderot
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