OpenAI Machine Learning Interview Questions

These are the 10 OpenAI machine learning interview questions AceOffer has reconstructed from candidate reports, sorted by how often each was reported. ML Search / RAG System Design leads at 16×. Every question shows when it was last reported; the catalog refreshes monthly.

Part of the full catalog of OpenAI interview questions, covering every round.

Key facts

•10 distinct machine learning questions indexed
•57 candidate reports across those questions
•Most reported: ML Search / RAG System Design — 16× (last seen March 2026)
•Refreshed monthly · last updated October 2026

Which OpenAI rounds ask machine learning questions?

The OpenAI rounds below are where these questions come up. Counts are distinct questions, not times asked.

Technical deep dive10 questions

Most reported: ML Search / RAG System Design — 16×

Which OpenAI machine learning questions get asked most?

Sorted by candidate-report frequency. Click any question for the full breakdown.

Question	Round	Reported	Last seen
ML Search / RAG System Design Design a Retrieval-Augmented Generation (RAG) system, typically framed as an enterprise-grade system that allows employees to ask questions over internal documents (similar…	Tech Deep Dive	16×	March 2026
Backpropagation An ML coding interview (typically 60–75 minutes) at OpenAI Research covering basic linear algebra and backpropagation. The 60-minute version uses Excalidraw (or…	Tech Deep Dive	13×	September 2026
Applied Statistics and Probability A 75-minute OpenAI Research onsite round that integrates probability theory, applied statistics, mathematical derivations, and Python/NumPy coding. The round is open-ended and…	Tech Deep Dive	9×	March 2026
Improve Tool / Image Recognition Model Training OpenAI has a product feature where users upload photos of real-world tools (e.g., hardware, equipment) and ask the model to identify them.…	Tech Deep Dive	6×	December 2025
LLM Decoding Stopping Time / Probability Distributions You are given an oracle LLM whose inference/problem-solving time T follows some probability distribution with known expected value E[T] = 1. The…	Tech Deep Dive	5×	July 2026
Multiprocessing / Distributed Neural Network Debugging Upcoming round. Candidate asking if this involves: concurrency bugs (race conditions, deadlocks, duplicate consumption) vs. distributed issues…	Tech Deep Dive	3×	April 2026
GPU Infrastructure and Kubernetes	Tech Deep Dive	2×	August 2026
Building a Terraform Unknown infrastructure/provisioning question (candidate had never encountered before). Interviewer provided no feedback for 30 minutes, then indicated…	Tech Deep Dive	1×	August 2026
ML Fundamentals (Oral) A one-hour oral Q&A session (no coding) covering machine learning theory, ranging from foundational concepts (overfitting, underfitting) through to more advanced topics…	Tech Deep Dive	1×	November 2025
FP8/BF16 Mixed Precision Training & Numerical Overflow Explain how mixed precision training works when combining FP8 and BF16 formats. Specifically, discuss: (1) why these formats are used together in…	Tech Deep Dive	1×	April 2026

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FAQ

How many machine learning questions does OpenAI ask?▾

AceOffer has reconstructed 10 distinct OpenAI machine learning interview questions from 57 verified candidate reports, each with verbatim follow-ups and a last-reported date.

What is the most common OpenAI machine learning interview question?▾

ML Search / RAG System Design — reported 16 times, last seen March 2026.

How fresh is AceOffer's OpenAI machine learning question data?▾

The catalog is refreshed monthly from new candidate reports, and every question shows when it was last reported.

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