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Updated weekly · Last refresh Aug 30

OpenAI Machine Learning Engineer Interview Questions

The questions to prepare for a OpenAI Machine Learning Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
CodingStart here. 15 questions · ~158 min
Beam Search for Sequence GenerationHard
Practice

Generate the highest-scoring token sequence with beam search using bounded candidate expansion.

OpenAI
KL Divergence ImplementationEasy
Practice

Compute KL divergence between two discrete probability distributions while handling zero-probability events and numerical precision.

OpenAI
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2
Machine Learning21 questions · ~221 min
Mixture of Experts ArchitecturesMedium

Tests ability to describe MoE routing, scaling benefits, and training considerations.

OpenAI
Choose Loss for Moderation ModelsMedium

Compare cross-entropy and MSE by training moderation models for binary policy violation classification and continuous severity scoring.

OpenAI
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3
Statistics & Probability6 questions · ~63 min
Markov Bound for Tail ProbabilityMedium

Assesses ability to apply probability inequalities to bound tail events.

probabilityOpenAI
Success Rate With One RestartMedium

Evaluates ability to compute success probabilities under timeouts and restarts.

model inferenceOpenAI
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4
Behavioral & Leadership6 questions · ~63 min
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5
More topics2 questions · ~21 min
Serving a 70B LLM at ScaleMedium

Tests system design for latency, throughput, memory, and reliability when serving large LLMs.

OpenAI
ML Coding With Infrastructure FocusMedium

Evaluates readiness to handle production-minded ML engineering tasks and systems constraints.

InfrastructureCodingOpenAI
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