OpenAI LeetCode Interview Questions
OpenAI has asked 17 distinct LeetCode questions across all recorded interviews: 1 easy, 14 medium and 2 hard. The questions reported most often are Design SQL, Design Memory Allocator and Encode and Decode Strings. 1 of them was reported in interviews from the Last 30 Days window. Every question links straight to LeetCode, and the list can be filtered by difficulty and topic or sorted by how often the question comes up.
| # | Problem | Difficulty | Frequency | Acceptance | |
|---|---|---|---|---|---|
| 1 | Design SQL | Medium | 100 | 0.6% | |
| 2 | Design Memory Allocator | Medium | 91 | 0.5% | |
| 3 | Encode and Decode Strings | Medium | 89 | 0.5% | |
| 4 | Flatten Nested List Iterator | Medium | 86 | 0.7% | |
| 5 | Time Based Key-Value Store | Medium | 79 | 0.5% | |
| 6 | IP to CIDR | Medium | 79 | 0.5% | |
| 7 | Rotting Oranges | Medium | 76 | 0.6% | |
| 8 | Design Excel Sum Formula | Hard | 69 | 0.4% | |
| 9 | Simplify Path | Medium | 65 | 0.5% | |
| 10 | Web Crawler Multithreaded | Medium | 50 | 0.5% | |
| 11 | Largest Local Values in a Matrix | Easy | 50 | 0.9% | |
| 12 | Asteroid Collision | Medium | 50 | 0.5% | |
| 13 | Trapping Rain Water | Hard | 50 | 0.7% | |
| 14 | Design Spreadsheet | Medium | 50 | 0.7% | |
| 15 | Design Hit Counter | Medium | 50 | 0.7% | |
| 16 | Design Authentication Manager | Medium | 50 | 0.6% | |
| 17 | Snapshot Array | Medium | 50 | 0.4% |
Where this data comes from
These questions come from the public leetcode-company-wise-problems data set, which collects interview reports from candidates. They are community-reported rather than published by OpenAI, so treat the list as a strong signal of what gets asked, not an official or exhaustive syllabus. Last refreshed .
How to read this list
The tabs at the top split the questions by how recently people said they were asked in interviews. "Last 30 Days" is the past month, "Last 3 Months" is the past quarter, and so on. "All Time" is every question on record for this company.
Frequency is a score from 0 to 100 for how often a question showed up in that time window. A higher number means it came up more often, so the list starts with the most common questions first. It is a relative popularity signal within OpenAI's questions, not a probability that you will be asked it. Acceptance is LeetCode's own share of submissions that pass for that problem, across all users, not something specific to OpenAI. Click any question to open it on LeetCode.