Microsoft Defender #1 in Antivirus Software
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Score over time
Shaded band = 95% bootstrap confidence interval. Orange markers = methodology events (model releases, panel versions). How this works
By model
ChatGPT (OpenAI)
Claude (Anthropic)
Gemini (Google)
Perplexity
By question type
Where Microsoft Defender shows up, by the intent behind the question. Every antivirus software panel asks the same balanced mix — 10 prompts per type — so these rates are directly comparable. A gap here (strong on recommendations, invisible on comparisons) is where AI visibility is being won or lost.
| Question type | Mentioned | Recommended |
|---|---|---|
| Recommendations “What's the best option for me?” | 40% | |
| Comparisons “How do the top options stack up?” | 13% | |
| Ready to buy “Which one should I actually get?” | 29% | |
| Problem-solving “I have this problem — what fixes it?” | 35% | |
| Informational “How does this kind of product work?” | 40% |
What the AIs say
Real answers from the latest measurement in which Microsoft Defender appeared — the receipts behind the score.
Claude (Anthropic) · listed #1
"Can a 100% free antivirus really keep me fully protected, or is it limited?"
…or no technical support - Some free tools collect/sell usage data as their business model ## The Real-World Verdict Free antivirus (like Windows Defender, Avast Free, or AVG Free) is **genuinely decent for basic protection** if you: - Practice safe browsing habits - Keep your OS and software updated - Avoid pirated content/sketchy…
Gemini (Google) · recommended · listed #1
"Is built-in Windows protection enough or should I add a separate antivirus?"
For the vast majority of users, **yes, the built-in Windows Security (formerly Windows Defender) is absolutely enough.** Years ago, Windows Defender was considered a basic, bare-minimum tool, and buying a third-party antivirus (like Norton, McAfee, or Bitdefender) was high…
ChatGPT (OpenAI) · recommended · listed #1
"I forgot to renew my antivirus subscription and now I'm worried about being exposed, what should I do?"
…ct, renew only from the vendor’s official website (not from surprise emails). - Or install a reputable free scanner right away (Windows: Microsoft Defender is built in; Malwarebytes is a good on-demand scanner; macOS: Malwarebytes for Mac; Android: Malwarebytes or Bitdefender; iPhone: keep iOS updated). 3. Disconnect or limit interne…
Perplexity · recommended · listed #1
"Just got a Windows 11 machine and need to pick a good antivirus, any suggestions?"
For most **Windows 11** users, **Microsoft Defender** is a solid default because it’s built in, free, and included with Windows Security.[14][12] If you want a third-party suite, **Bitdefender** and **Norton** are the most consiste…
Where the AIs get it from
Domains cited by search-backed answers that mentioned Microsoft Defender (79 answers, 2026-08-01). Your own domain is highlighted — presence in the others is the GEO opportunity.
| Cited domain | Answers citing it |
|---|---|
| reddit.com | 78 |
| youtube.com | 72 |
| learn.microsoft.com own domain | 52 |
| pcmag.com | 51 |
| cybernews.com | 40 |
| security.org | 34 |
| pcworld.com | 25 |
| experte.com | 20 |
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Head-to-head: Microsoft Defender vs Bitdefender · Microsoft Defender vs Malwarebytes · Microsoft Defender vs Norton — or the full Antivirus Software leaderboard.
Data from run #89. Methodology