← Openai Interview Insights

Openai·Software Engineer·Technical Phone Screen·Intermediate

Intermediate
Jun 2026

Summary

Did a 60-minute ML coding interview at OpenAI in a live notebook environment. It mixed math, coding tasks, and an open-ended research brainstorm, which is a format I hadn't really prepped for and it showed.

Questions Asked (2)

Q1

Implement a small numerical or ML-related task in a live Python notebook environment.

Algorithms & Data StructuresTechnical Trade-offs
Author's notes

The notebook format threw me more than I expected.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the task requirements and constraints, then outline a clear plan before coding. Implement a simple, correct solution first, then optimize or add complexity as time allows, explaining your reasoning throughout.

Pro tip: Narrate your thought process and trade-offs as you code; interviewers value clear communication and problem-solving over silent perfection. If stuck, simplify the problem and state assumptions.

1. Clarify and Plan

Ask clarifying questions to understand the task scope, inputs, outputs, and constraints. Outline your approach and get buy-in before coding.

2. Set Up and Sanity Check

Import necessary libraries, create a small sample input, and verify your environment. Write a quick test case to validate your understanding.

3. Implement a Baseline Solution

Code a straightforward, correct solution first, even if not optimal. Focus on readability and modularity.

4. Test and Debug

Run your code on the sample and edge cases. Debug any issues and verify correctness.

5. Optimize and Discuss Trade-offs

If time permits, improve efficiency or handle edge cases. Discuss alternative approaches and their trade-offs.

Key Points to Mention

  • Clarifying questions to define the problem and constraints
  • Choice of libraries (e.g., NumPy, pandas, scikit-learn) and why
  • Time and space complexity of your solution
  • Edge cases and how you handle them
  • Testing and validation strategy
  • Trade-offs between simplicity, performance, and scalability

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.

Q2

Discuss and brainstorm open-ended research ideas related to machine learning.

Product Sense & IdeationAdaptability & Ambiguity
Author's notes

This part surprised me.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the scope and constraints (e.g., time, resources, impact) to show product sense, then brainstorm 2-3 research ideas that align with OpenAI's mission and current challenges, and finally dive into one idea with a testable hypothesis and potential evaluation metrics. Emphasize feasibility, scalability, and alignment with OpenAI's values like safety and beneficial AGI.

Pro tip: Tie your ideas to OpenAI's existing work (e.g., RLHF, multimodal models, safety) and propose concrete next steps, showing you understand both the research and engineering trade-offs.

1. Clarify scope and constraints

Ask clarifying questions to understand the context, such as whether the focus is on foundational research or applied product features, and what resources or timelines are involved.

2. Brainstorm broad ideas

Generate 2-3 high-level research directions that are open-ended but relevant to OpenAI's mission, such as improving model reasoning, safety, or efficiency.

3. Select and refine one idea

Choose the most promising idea and refine it into a specific research question with a clear hypothesis, potential methods, and expected outcomes.

4. Discuss feasibility and impact

Outline how you would approach the research from an engineering perspective, including data, compute, evaluation metrics, and potential challenges.

5. Summarize and invite feedback

Concisely recap your idea and its value, then invite the interviewer to discuss or suggest alternative directions, showing openness and adaptability.

Key Points to Mention

  • Alignment with OpenAI's mission and safety principles
  • Scalable and efficient training methods (e.g., few-shot learning, model compression)
  • Interpretability and robustness of large language models
  • Multimodal learning and grounding language in perception
  • Reinforcement learning from human feedback (RLHF) and its extensions
  • Evaluation metrics and benchmarks for open-ended tasks

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.