OpenAI's own interview guide tells you, in plain language, what the final stage is: roughly 4 to 6 hours of interviews with 4 to 6 people, run over one or two days. It also says the company isn't credential-driven and that the questions are meant to "stretch you beyond your comfort zone." That's a useful starting point, because it's one of the few numbers OpenAI publishes about itself. Most of what's written about this loop comes from candidates, not from the company, and you should treat it that way.

I want to be honest up front about the limits here. OpenAI's process is less publicly documented than a Google or an Amazon loop, and it varies more from team to team. If someone hands you an exact round-by-round script and swears it's universal, they're guessing. What follows is the shape that shows up consistently across the public record, with the soft spots flagged.

Why this loop gets extra attention right now

OpenAI is one of the companies in what people started calling MANGO in June 2026, the AI-era reshuffle of the old FAANG acronym (Meta, Anthropic, Nvidia, Google, OpenAI). TechCrunch covered the shift as a marker of where the talent and the money moved. Whether the label sticks past this news cycle, I genuinely don't know. But the underlying thing is real: a lot of strong engineers are now aiming their prep at OpenAI specifically, and the loop rewards a different kind of preparation than the classic big-tech algorithm grind.

The rounds, and what each one is really probing

Here's the version that holds up across candidate reports and the third-party guides. Read the stage names loosely. The order shifts, rounds get merged, and the exact onsite count moves with your level and the team you're talking to.

One thing the table can't capture: leveling happens after the loop, not before it. Candidates run the same interviews whether they're aiming for mid or staff, and the level gets assigned based on how the whole thing went. Reported outcomes have landed anywhere from L2 to L6. So there's no separate "senior track" to prep for. There's one bar, and where you land on the ladder is decided once it's over.

The coding round is not the LeetCode round you trained for

This is the part people get most wrong, so I'll be blunt about it. OpenAI's coding interviews skew practical. Instead of "reverse a binary tree," you're more likely to get "build a resumable iterator with state management" or "implement a key-value store with serialization." The Exponent guide describes the format as a progressive obstacle course: one problem with several gates of rising difficulty, where clearing two is the bar and clearing all of them puts you in a very small group.

And here's the catch that trips up otherwise strong candidates. The coding bar doesn't get averaged against the rest of your loop. Multiple candidates have reported being told a weak coding score won't be rescued by acing system design or behavioral. You can't coast the code and make it up later. Production quality is part of the grade too. A hacky solution that passes the visible tests but reads like nobody else could maintain it is not a pass.

If I'm honest, this is the round I'd over-index on. The take-home and the deep dive reward depth you already have. The coding gates reward a specific muscle: writing clean, edge-aware code on a novel problem, fast, while someone watches. That's trainable, and it's the cheapest place to lose an offer.

Research roles versus product roles

Not every OpenAI seat runs this exact loop. The software and infrastructure tracks lean toward the coding-and-design shape above, with Python as the default language and Rust or Go showing up in infra work. Research and research-engineering roles weight things differently, with more emphasis on the depth of your past work and your ability to reason about model behavior. I don't have a clean public breakdown of how the research loop is scored, and I'd rather say that than invent a round count. If you're going for research, ask your recruiter directly what the panel looks like. They'll tell you, and it's the most reliable source you'll get.

What it pays, with the usual caveat

Comp at OpenAI carries a large equity component, and equity at a still-private company is the part nobody can value precisely. The numbers below are reported figures, not promises, and the stock portion is the most uncertain piece of any of them.

For field context: the BLS Occupational Outlook Handbook put the median software developer wage at $133,080 in May 2024, with the role projected to grow 15% from 2024 to 2034. An OpenAI median lands at roughly four times the national figure for the same job title. Most of that gap is equity, though, and equity in a private company is a bet, not a salary. If the company's mark moves, your number moves with it.

What we hear from candidates prepping OpenAI-style loops

When people run OpenAI-style mock loops with the LastRound AI copilot, the pattern we hear most isn't about algorithms. It's that the coding round keeps moving the goalposts. They solve the base case, feel good, and then the interviewer layers on a state wrinkle or an ugly edge condition, and the clean little function they wrote starts to buckle. The candidates who do well tell us they stopped optimizing for "finished" and started optimizing for "this still reads well after the third twist." On the deep dive, the recurring note is the opposite of the coding round: people under-prepare it, assuming their own project is easy to talk about, then get pulled three follow-ups deeper than they expected into why they made a call. We don't have a tidy success percentage to quote you, and I won't pretend we do. The signal is qualitative and it's consistent: prep the code like it's the gate that filters you, because it usually is.

How I'd actually prepare

Short version. Train the coding gates harder than feels comfortable, on practical build-a-small-system prompts rather than puzzle sets, and practice writing tests and handling edge cases out loud. For system design, run the scaling drill: take a normal design and ask what breaks first at 10x, then 100x, then 1000x, and name the component. For the deep dive, pick one project you can defend to the studs, including the decisions you'd make differently now. And have a real, specific answer to "why OpenAI." The interviewers are deep in the mission, and a generic "I'm excited about AI" reads as someone who'd be equally happy anywhere. None of this is exotic. It's just pointed at the rounds that actually decide it, instead of the rounds you're used to over-preparing. To get there, it helps to rehearse the OpenAI loop in a mock interview and to read up on OpenAI's teams and recent work so the "why OpenAI" answer comes out specific instead of generic.

Tools that help you prep OpenAI: rehearse the coding gates in a mock interview, tailor your resume for the role, and research OpenAI's teams before the loop.