Bain AI Interview: The Immersive Case Explained

Key Insights

• Bain’s AI interview is called the immersive case. You get 40 minutes to work a client problem with Excel, PowerPoint, and ChatGPT, then 40 minutes to present and defend your answer.
• It’s already showing up in final rounds. Experienced hire Consultant candidates have reported it, and MBA candidates at several top business schools have been told to expect it. First-year MBA candidates recruiting for 2027 internships should prepare for it this winter.
• Bain is judging your recommendation and how well you defend it. The tools are there to help you get to a better answer faster.
• The best prep is full, timed reps. 40 minutes to build a few slides, 10 to present, and 30 to take pushback from someone who knows what Bain looks for.

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Bain has started running a new AI interview format in final rounds. The firm calls it the immersive case, and candidates who’ve taken it describe it as a written case with AI and Office tools added.

Earlier this year, Bain’s global head of recruiting, Ron Kermisch, said Bain would add AI to its interviews starting in summer 2026. The immersive case is the first version candidates have described in detail, and it’s different from what most people (us included) expected.

Bain hasn’t published anything about the format yet. Everything below comes from candidates in our community who went through it or were told to expect it.

What Is the Bain Immersive Case?

The immersive case is an 80-minute exercise in two parts. Bain describes it to candidates as a chance to show what you can do in a situation closer to real client work.

That line comes straight from the instructions Bain sent candidates. It tells you what the tools are for: speed and a better answer.

Part 1: 40 minutes of prep

You get a description of a client situation, a set of related files, and the key questions the client needs answered. Your job is to answer those questions and build a recommendation.

Bain gives you Excel, PowerPoint, and ChatGPT to work with. Nothing in the instructions candidates shared says an interviewer watches you during prep, so plan on working through this part on your own.

Part 2: 40 minutes with your interviewer

You get 10 minutes to present your answer. Then you spend 30 minutes discussing your recommendation and the client situation with your interviewer.

Between the presentation and the 30-minute discussion, the discussion matters most. It’s three times longer than your presentation, and it’s where your interviewer will test your numbers, your assumptions, and what you’d do if one of them turned out to be wrong.

Who Is Getting the Immersive Case?

So far, we’ve heard from two groups.

• Experienced hire Consultant candidates in final rounds. Multiple candidates told us their final round had three interviews: one immersive case, one regular case, and one behavioral interview.
• MBA candidates at several top business schools in the U.S. and Canada. Students at more than one school have been told Bain will run the immersive case in their final round, and we expect more schools to follow.

If you’re a first-year MBA recruiting for a 2027 Bain internship, plan on it. We expect Bain to test the format in first-year MBA interviews this winter, which means every first-year targeting Bain should prepare for the immersive case alongside the regular case.

Bain hasn’t said which offices or roles use it. If you have a Bain final round coming up, ask your recruiter which interview formats your round includes. It’s a normal question, and the answer changes how you should spend your prep time.

Immersive Case vs. Bain’s Other Interviews

In the rounds we’ve heard about, the immersive case runs in the same round as Bain’s regular case interview. Here’s how the two compare.

	Regular case	Immersive case
How you work	Live with your interviewer the whole time	On your own for 40 minutes, then present and discuss for 40
Tools	Pen and paper	Excel, PowerPoint, ChatGPT
What you produce	A spoken recommendation	A recommendation you present in 10 minutes, likely with slides
Where it shows up	Every round	Final rounds (so far)

Candidates who’ve taken it say it feels more like a written case than a regular one. The difference is the tools: Bain expects you to use Excel and ChatGPT to get through the files faster, and PowerPoint to show your answer.

How It Compares to McKinsey’s Lilli Interview

McKinsey’s Lilli interview is a live case where you use McKinsey’s internal AI tool while explaining your approach to the interviewer. The interviewer watches how you prompt and how you handle what the tool gives back.

Bain’s immersive case flips the order. You do the work first, mostly on your own, with a public tool (ChatGPT) and standard Office software. Then you present the result and defend it.

So at McKinsey, your process is on display while it happens. At Bain, your process shows up in what you built and how well you can explain it.

McKinsey is testing other formats too. Simone Jacobi, McKinsey’s Director of Talent Assessment, walked us through how McKinsey uses AI in case interviews, and we’ve covered its AI avatar interview and its new behavioral interview pilot.

What Bain Is Really Testing

Bain hasn’t published scoring criteria for the immersive case. Based on the format and what candidates have told us, here’s what we’d expect Bain to look for.

1. Getting to an answer in 40 minutes

Can you figure out which files matter, run the analysis that answers the client’s questions, and stop? Candidates who try to analyze everything run out of time before they build anything.

2. Using the tools for the right jobs

Bain told candidates it wants the tools to make their time and answer better. Using ChatGPT to summarize a long file or draft a slide headline fits that. Asking it to solve the case for you probably doesn’t.

3. Catching bad numbers

ChatGPT can misread a spreadsheet or get basic math wrong. If a bad number makes it onto your slide, expect your interviewer to find it.

4. Defending your answer

30 minutes of discussion is a long time. You’ll need to explain where each number came from, what changes if an assumption is wrong, and what the client should do first.

These are the same skills a regular case interview tests. The immersive case adds real files, real software, and less time to hide.

What About Bain Evaluating AI in Your Prep?

When Bain first talked about its AI interview, Kermisch suggested the firm might also look at how candidates use AI to prepare. None of the candidates we’ve heard from has seen any sign of that, so we’d treat it as unconfirmed.

Your prep habits still matter, just for a different reason. If you use AI to hand you answers in practice, you’ll do the same thing in the real interview. Use it to poke holes in your thinking instead.

How to Prepare for the Bain Immersive Case

Most of your prep should look like the real thing: a timed exercise with files, tools, and a person pushing back on your answer.

1. Run full 80-minute reps

Set a timer for 40 minutes of prep, present for 10, then have a partner question you for 30. Use a case with data exhibits you can drop into Excel, and do more than one rep before your final round. The first one always runs long.

2. Plan your 40 minutes before you open a file

Here’s a split to start with: five minutes reading the questions and writing down your first guess at the answer, 20 minutes on analysis, 10 minutes building slides, and five minutes rehearsing your pitch. Adjust after your first rep.

3. Get fast at the basics in Excel and PowerPoint

Bain says you don’t need to be an expert. You do need to sort and filter data, build a quick calculation, and make a clean chart without stalling. Our guide to AI prompts for Excel shows how to use ChatGPT to speed up the Excel work.

4. Give ChatGPT the grunt work, then check it

Good jobs for ChatGPT: summarizing a long file, pulling key figures out of a document, checking your math, and drafting slide headlines you then rewrite. Before any number goes on a slide, check it against the source file yourself.

5. Keep the deck short

You have 10 minutes. Two or three slides is plenty: your answer first, then the evidence behind it, then risks and next steps.

6. Practice the 30-minute defense

Have your partner ask the questions a Bain interviewer would: Where does this number come from? What if demand is 20% lower than you assumed? What should the CEO do on Monday? Answer each one in a sentence or two, then back it up.

7. Don’t drop your regular case and behavioral prep

The immersive case is one interview out of three in the rounds we’ve heard about. A great immersive case won’t save a weak regular case. Keep your case frameworks, mental math, and behavioral stories sharp.

Want the Exact Prompts to Use in the Interview?

Knowing the format is one thing. Using ChatGPT well with the clock running is another.

Most candidates struggle with what to actually type. They write vague prompts, use the tool for the wrong jobs, or trust numbers they should have checked.

Our AI Interview Prompt Playbook gives you prompts for each stage of a case, a step-by-step workflow for working with AI under time pressure, and the mistakes to avoid in the moment. It’s available to Black Belt clients and students at MC partner schools.

Black Belt also pairs you with an MBB coach who can run timed reps with you and push back the way a Bain interviewer will, plus an AI case coach you can practice with between sessions.

Common Pitfalls to Avoid

These are the mistakes we’d expect to cost candidates the most in this format:

• Spending 35 of your 40 minutes on analysis and leaving no time to build or rehearse
• Putting a number on a slide you didn’t check
• Letting ChatGPT write your recommendation. Your interviewer will ask why, and you need your own answer.
• Building eight slides for a 10-minute presentation
• Getting defensive in the discussion. If your interviewer finds a weak spot, say so and explain how it changes your answer.

Conclusion

The immersive case looks a lot like a day on a Bain project: a stack of files, a deadline, the tools consultants use, and someone asking why you believe your answer.

You win it the same way you win a regular case. Get to a clear answer fast, and make sure it holds up when someone pushes on it.

If Bain is on your list this cycle, start your timed reps now, with a coach who knows what Bain looks for. Start with Black Belt.

Bain AI Interview: Frequently Asked Questions