AI-assisted interviews on HackerRank, CodeSignal and CoderPad (2026): what is allowed and what employers see

The short version: AI is allowed when the platform provides it

A few years ago the rule in a coding interview was simply “no AI”. In 2026 the three platforms that run most remote coding rounds all sell an AI-assisted format, because employers want to see how candidates work with the tools they will use on the job. What has not changed is who decides. The employer switches the assistant on or off for each test or interview, and the platform logs how you use it. So the real question is not “can I use AI?” but “did this employer enable the assistant for this round?”. The invitation, the test instructions or the interviewer will tell you.

The background on why companies are moving to this format, with Canva and Meta as examples, is in the AI-assisted coding interview. This page is about the rules on each platform.

HackerRank: guarded and unguarded AI, watched live

HackerRank documents two separate features. For live interviews, its knowledge base article “AI Assistant in Interviews” says the assistant “lets candidates use AI during live interviews and lets you observe their interactions in real time.” An admin turns it on under Settings, Interview Settings, “AI Assistant for Candidates”, and chooses whether it is always on or set per interview. The employer also chooses which models candidates can pick from. The default, according to the article, is GPT-5.6 Terra.

How much the assistant will do depends on the question type. In ordinary coding questions it runs in guarded mode: it helps with syntax, platform navigation and programming concepts, but does not hand over complete solutions. In code repository questions it runs unguarded, with plan and agent modes that can investigate the codebase, generate code and edit files. The interviewer sees the assistant panel as you use it, and after the interview the report contains the complete conversation. The older interview interface works the same way: its article says the AI Assistant panel “remains fully visible to the interviewer”.

For tests (online assessments), the “AI-Assisted Tests” article describes the same guarded and unguarded modes, set per test section by the employer. The AI Assistant transcript “is enabled by default for all AI-Assisted Tests” and appears in the detailed report, with an optional AI Fluency view of how you worked with the assistant. Separately, HackerRank's AI Plagiarism Detection for coding questions looks at copy-pasting of significant code from external sources, coding patterns, multiple iterations and tab-switching. Its FAQ says if you solve a question in an external IDE and paste it in, the system “is likely to flag this behavior as suspicious activity”, while project questions that support an offline workflow do not trigger a flag. HackerRank also stresses that “human oversight remains crucial”. More on the format itself in what to expect in a HackerRank interview.

CodeSignal: Cosmo, with a transcript and a replay

CodeSignal announced AI-assisted coding assessments and interviews in a press release dated 28 May 2025. The built-in assistant is called Cosmo and comes in two modes. In the release's words, “Full AI Co-Pilot Mode enables developers to tackle advanced challenges with real-time AI collaboration”, while “Guided Support Mode provides limited AI help focused on platform navigation, syntax, and documentation.” Both are available for skills assessments and for live technical interviews.

On visibility the release is direct: “Alongside session replays, hiring leaders gain access to transcripts of all AI interactions.” CodeSignal's product blog repeats that each AI-assisted assessment or interview includes a full transcript of candidate–AI interactions and a session replay. Expect every prompt to be read, and expect the replay to show how your code developed, not only where it ended.

Outside the assistant, CodeSignal's integrity page describes a Suspicion Score that analyses “solution similarity, telemetry, and copy-paste activity” and says it can identify “patterns that may indicate AI-assisted behavior”. Optional proctoring records video, audio and screen activity, with “human reviewers validating flagged activity and final decisions.” The same page shows an “Allow AI Usage” toggle among the employer's optional safeguards, which is another sign that AI use is the employer's setting, not the candidate's choice. For the standard non-AI test, see the CodeSignal General Coding Assessment.

CoderPad: AI Assist, saved in playback

CoderPad's documentation page for AI Assist (last modified 2 July 2026) says “AI Assist is available on all pads by default”. The organisation setting decides whether it starts on or off for new pads, and the interviewer can switch it for an individual pad from Pad Settings. Candidates pick a model and type a prompt; the screenshots in the docs list GPT-5, GPT-4o mini, Claude Sonnet 4, Claude Haiku 3.5, Gemini 2.5 Pro and Llama 4 Maverick. Claude Code and Codex are listed as Enterprise-only and limited to multi-file languages.

The key line for candidates: “All pad users' prompts and AI output will be saved for review in playback mode.” There is also a Private AI Assist mode that only the interviewer can see, so the interviewer may be using AI on their side too. CoderPad's page on cheating prevention tells interviewers to enable AI Assist so that AI use is visible, and to tell candidates to keep any AI use inside the AI Assist tab. The same page lists alerts when a candidate pastes code from an external source or leaves the IDE, and a full session timeline with edits, runs and copy-paste events. It adds that alerts should be treated as “prompts for clarification, not immediate disqualification.” More in what to expect in a CoderPad interview.

What the employer actually learns from the log

All three platforms sell the AI-assisted format as a way to see how you work, not just whether your code passes. Reading the documentation together, the log shows three things:

• Your prompts. “Solve this” and “write a function that merges these intervals, keeping the input sorted, and explain the edge cases” read very differently in a transcript.
• What you did with the answer. Replays and playback show whether you accepted generated code unread, tested it, or fixed it. Catching the assistant's bug is often worth more than avoiding the assistant.
• The order of work. Whether you planned first, then prompted for pieces, or pasted the whole task in at minute one.

How to prepare for an AI-assisted round

1. Confirm the rules in writing. Ask the recruiter which assistant is enabled and whether any outside tools are permitted. If the answer is “only the built-in assistant”, that is the rule, and the logs above are how it is checked.
2. Practise with the same kind of assistant. Guarded mode on HackerRank will not write the solution for you, so practise asking for syntax and concepts rather than whole answers. If you will have a full co-pilot, practise breaking a task into parts and prompting for one part at a time.
3. Plan before you prompt. Spend the first minutes restating the problem, asking clarifying questions and sketching an approach. It shows in the transcript and in the replay.
4. Read and test every generated line. Write a few tests early and run them after each AI change. Say out loud what you are checking if the round is live.
5. Keep your fundamentals. You still need to judge whether a solution is correct and efficient. Our guide to LeetCode-style problems in real interviews covers the patterns worth knowing.

Where an outside assistant like Interview Copilot fits, and where it does not

We make Interview Copilot, a desktop app that listens to the call and suggests answers, so this section is about our own product. It belongs in rounds where your own tools are explicitly allowed, and in conversations where no coding platform rules apply: phone screens, behavioural rounds, system design discussions. In a HackerRank, CodeSignal or CoderPad round that enables a built-in assistant, use that assistant, because it is the one being evaluated and the one the rules allow. In a round where AI is not enabled, the rules are “no AI”, and we do not offer advice on getting around a platform's integrity checks.

Where it is weaker for this use case: it is not integrated into any coding platform, it produces no transcript the employer can review, and its free tier is short (5 minutes of live recognition and 3 screenshot solutions). Pro is 25 $ for 30 days, paid once. See the coding interview assistant page for what it does in rounds where it is allowed.

How we checked

Everything here comes from the platforms' own pages, read on 13 October 2026: HackerRank's knowledge base, CodeSignal's press release, product blog and integrity page, and CoderPad's documentation. HackerRank's articles show only relative dates (“last updated 25 days ago”, “1 month ago”, “2 months ago”), so we give those as they appeared on that day. We did not use third-party “how to pass” guides, several of which describe older versions of these features. Platforms change these settings often, and the employer's own instructions always override a general guide like this one.

Sources

• HackerRank: AI Assistant in Interviews
• HackerRank: AI-Assisted Interviews (legacy interface)
• HackerRank: AI-Assisted Tests
• HackerRank: AI Plagiarism Detection
• CodeSignal: AI-assisted assessments and interviews launch (28 May 2025)
• CodeSignal: introducing AI-assisted coding assessments and interviews
• CodeSignal: cheating and fraud prevention
• CoderPad: AI Assist documentation
• CoderPad: cheating prevention and detection in Interview

All read on 13 October 2026.

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