ChatGPT for case prep, and where a structure coach fits
What ChatGPT does well for case interview preparation, three prompts that work, what it cannot do mid-case, and how a live structure coach fits beside it.
Updated October 28, 2026
| Prep task | ChatGPT (or any general assistant) | Casepartner |
|---|---|---|
| Explain a framework | Good. Ask, read, ask again. | Not its job; the guides on this site do that. |
| Read a case to you | Fair. It can play interviewer from a prompt; it has no exhibits unless you paste them and it tends to agree with you. | Not its job; it listens to whatever is running the case. |
| Critique your structure after the fact | Good, with a clear rubric in the prompt. | Shows its own structure hint after each interviewer turn, so you compare live. |
| Math drills | Good for generating drills; check its arithmetic. | Shows a math check when a number lands in a case. |
| Behavioral stories | Good for drafting and tightening a story. | Shows a STAR skeleton when a fit question lands; with a story bank, names your story. |
| During a recorded or partner mock | Not built for it; typing mid-case breaks the case. | Built for it: shared tab audio, one hint under 40 words, in about a second. |
| During a real interview | The firms’ positions apply to any tool; quoted in the policies guide. | Same. Built for practice; your call, in plain view. |
Is ChatGPT good for case interview prep?
Yes, for the study half. PrepLounge, which sells its own case practice product, says so plainly:
ChatGPT can be a great study partner for your case interview preparation in consulting.
And McKinsey’s careers page marks practicing interview questions with AI as encouraged, in the same table that marks real-time answers during an interview as not allowed:
We know many candidates use AI to prepare, whether that’s polishing a resume or practicing interview questions—just as people have long sought feedback from mentors, friends, or family. When used responsibly, we see AI as a valuable tool that supports preparation.
So the question is not whether to use a general assistant but what for. It explains frameworks well, generates drills quickly, and critiques a structure you paste in. It is weakest at being the interviewer: it has no exhibits unless you give it some, it rarely pushes back on a confident candidate, and it cannot keep a rubric constant from one session to the next unless you paste the rubric every time.
Three prompts that work
- Framework check. “Here is my 60-second structure for a profitability case about a regional grocer. Score it on: two levels only, one industry detail per bucket, ends with a question. Quote the weakest line.”
- Drill generator. “Give me ten case math drills on percentages and breakevens, answers hidden until I ask, and check my answers one at a time.” Verify its arithmetic; the drills page has twenty with script-checked answers.
- Story tightener. “Here is my led-without-authority story in four beats. Cut it to 150 words, keep the reasoning before each action, keep the number at the end.”
What is Casepartner for, then?
The practice turn. Run a recorded mock interview, a casebook walkthrough on video, or a partner session in a browser tab; share the tab’s audio; after each interviewer turn the window shows one hint in a fixed shape. The value is the comparison between its hint and what you said: the structure you gave against the buckets it shows, the question you asked against the one it would ask, the math you did against its check. A general assistant cannot sit in that seat because you cannot type to it mid-case without stopping the case.
Can either be used in a real interview?
That is the firm’s rule, not the tool’s. McKinsey lists generating real-time answers during an interview as not allowed; BCG asks for your own responses unless it has said AI tools are allowed; Bain publishes nothing. All quoted with dates in the firm policies guide. Casepartner is built for practice, behaves the same way live, sits in plain view, and leaves that decision to you.
A week that uses both
| Day | General assistant | Casepartner |
|---|---|---|
| Mon | Explain one framework; ten drills | |
| Tue | One recorded case, compare structures after each turn | |
| Wed | Critique Tuesday’s structure from memory | |
| Thu | One partner case over a call, tab audio shared | |
| Fri | Tighten two behavioral stories | Behavioral mode on five fit questions |
| Weekend | One full mock with a human and nothing open | |
Questions
Can ChatGPT do case interview prep?
Yes, for study: explaining frameworks, generating drills, critiquing a pasted structure, tightening stories. PrepLounge says as much, and McKinsey marks practicing interview questions with AI as encouraged.
Can ChatGPT run a mock case interview?
A rough one. It has no exhibits unless you supply them, it tends to agree with a confident candidate, and it keeps no rubric between sessions. Use it for the first cases, then a partner or an AI interviewer.
Is Casepartner a ChatGPT alternative?
No. It does not answer questions. It listens to whatever is running a practice case and shows one hint per interviewer turn, so you compare it with what you said.
Can I use ChatGPT during a real interview?
McKinsey lists real-time answers during an interview as not allowed and BCG asks for your own responses unless told otherwise; the firm policies guide quotes both. The rule applies to any tool.