Anthropic Online Assessment (OA) Questions

These are the 8 online assessment (OA) questions Anthropic candidates reported receiving, sorted by how often each was reported, and all of them are free to read. Banking System (OA) leads at 17×. Every question shows when it was last reported; the catalog refreshes monthly.

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

Key facts

•8 distinct OA questions indexed
•46 candidate reports across those questions
•Most reported: Banking System (OA) — 17× (last seen July 2026)
•All 8 free to read, no account needed
•OA reports span September 2024 – August 2026
•5 of 8 question pages mention CodeSignal
•Time limit mentioned: 90 minutes
•5 questions written in several parts
•Refreshed monthly · last updated October 2026

Which Anthropic rounds ask OA questions?

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

Async coding assessment8 questions

Most reported: Banking System (OA) — 17×

Which Anthropic OA questions get asked most?

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

Question	Round	Reported	Last seen
Banking System (OA)Free Design and implement an in-memory banking system in Python on CodeSignal: one class, four progressive parts (CodeSignal calls them levels), 90 minutes…	OA	17×	July 2026
In-Memory DatabaseFree The most reported Anthropic OA: twelve threads between May 2025 and July 2026, three of them quoting prompt text verbatim. A 90-minute…	OA	12×	July 2026
Task Management SystemFree A CodeSignal online assessment with no interviewer, five reports between January and August 2026 and a reply elsewhere naming it. Build one…	OA	5×	August 2026
VLIW / TPU / Kernel Optimization AssignmentFree Take-home coding assignment (2–4 hours, AI usage permitted) for Anthropic's acceleration/performance engineering roles. You are given a Python-based VLIW or TPU simulator…	OA	4×	December 2025
Recipe ManagerFree A 90-minute CodeSignal OA with no interviewer, three threads between November 2025 and April 2026 plus one more naming it. One candidate…	OA	3×	April 2026
Cloud File Storage SystemFree A CodeSignal online assessment with no interviewer, one of the handful of questions in Anthropic's OA bank, mentioned in three threads between…	OA	3×	July 2026
Step-by-step Implementation (OA Part i)Free Implement functionality in 0-7 incremental steps with increasing difficulty. Topics include recursion, caching, and concurrency. Requires camera…	OA	1×	June 2026
Debugging Exercise (OA Part ii)Free	OA	1×	June 2026

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FAQ

How many OA questions does Anthropic ask?▾

AceOffer has reconstructed 8 distinct Anthropic OA interview questions from 46 verified candidate reports, each with verbatim follow-ups and a last-reported date.

What is the most common Anthropic OA interview question?▾

Banking System (OA) — reported 17 times, last seen July 2026.

When does Anthropic send its online assessment?▾

The Anthropic OA reports AceOffer has run from September 2024 to August 2026; the most recent is from August 2026. Timing within a hiring cycle varies by role, so check each question page for its own dates.

Which platform does Anthropic use for the OA?▾

5 of the 8 Anthropic OA question pages mention CodeSignal, from candidate reports. Other reports do not name the platform.

How long is the Anthropic OA?▾

Reports mention a 90-minute limit. Each question page notes its own timing where candidates reported it.

How fresh is AceOffer's Anthropic OA question data?▾

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

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