Best AI for Chemistry? ChatGPT Plus Tested

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ChatGPT Plus is my top pick for chemistry - it works through calculation problems step by step, identifies the limiting reactant and follows rounding instructions. For checking individual school-level problems, free ChatGPT or Gemini should be enough.

This is one of the short answers in the Which AI for what? - 50 answers series. I tested it on 8 October 2026.

Three options: free, best overall and advanced

The Wolfram|Alpha price is from its official dollar price list. Information checked on 8 October 2026.

My mini-test

My AI for school ranking covered 9 models and 15 problems, but did not include chemistry. So I gave GPT-6.1 Sol two advanced chemistry problems through the API. The actual test was in Polish. The first was a stoichiometry problem with a catch: burning 50 g of propane in 150 g of oxygen means there is too little oxygen, not too much. The model correctly identified oxygen as the limiting reactant and calculated 124 g of CO₂ and 8.66 g of unreacted propane. The second problem asked for the pH of 0.01 M H₂SO₄, assuming complete dissociation. The result, 1.70, was also correct; the trap is counting only one proton, which gives 2. The test cost 0.013 USD.

How to study chemistry with AI, not just copy answers

1. Try the problem yourself first, then paste your working along with the question.
2. Ask the AI to identify your first incorrect step instead of giving you the full solution straight away.
3. Then ask for three similar problems with different numbers and test yourself again.

What to watch out for

• Molar masses: a model may use different rounding from your reference table, such as C = 12 instead of 12.01. Include the values you need in the question.
• Check structural formulas and reaction mechanisms against a textbook. A molecule’s text description may be right even when its drawn structure is not.
• Models commonly refuse requests involving hazardous reagents, explosives or drug synthesis - and rightly so.
• AI is not allowed in exams or tests, so use it as a tutor for practice at home.

A chemistry study prompt to copy

This is an English translation of a prompt template written in Polish; it is not a prompt tested in English.

You are my chemistry tutor (level: [standard / advanced / university]).
Problem: [paste the problem].
Molar masses from my reference table: [e.g. C=12.01; H=1.008; O=16.00].
My solution: [paste your working or write "none"].
1. If I provided a solution, identify the first incorrect step and explain why it is wrong. Do not continue solving.
2. If I did not provide a solution, solve it step by step: reaction equation, moles, limiting reactant, final answer with units.
3. Round the answer to [3] significant figures.
4. Write 2 similar problems with different numbers, without answers.

Frequently asked questions

Which AI can solve chemistry problems for free?

Free ChatGPT and Gemini can handle typical problems involving stoichiometry, concentration and pH. During a longer study session, you are more likely to hit a usage limit than encounter an error.

Can AI solve a problem from a photo?

Yes. ChatGPT and Gemini can read a photo of a problem from a notebook or exam paper. With handwritten formulas, check that the model transcribed the subscripts correctly before reviewing its answer.

Can you trust AI for chemistry?

For high-school-level calculations, my test went well: both answers were correct. Always check reference data and structural formulas against a textbook or exam reference tables.

Find more short answers in the Which AI for what? roundup. The AI for school ranking covers 9 models on problems from the Polish school curriculum; it is a Polish-language benchmark, not a test of performance in other languages. For a related subject, see which AI is best for physics.

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