# Intruder vs Microsoft Defender External Attack Surface Management: which do AI models recommend for ASM, October 2026

IT AI Recommendation Index, October 2026 Edition, Attack surface management. Eleven of fourteen models named Intruder first on the direct prompt; one named Microsoft Defender External Attack Surface Management. Page: https://it-ai-index.com/security/attack-surface-management/intruder-vs-microsoft-defender-external-attack-surface-management/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Intruder | 49% | #1 of 12 | 3% | 34 | 14 of 14 |
| Microsoft Defender External Attack Surface Management | 10% | #3 of 12 | 18% | 39 | 14 of 14 |

## The direct prompt, model by model

- Gemini 3.5 Flash: intruder first (first choices: Intruder) (alternatives: Detectify, UpGuard BreachSight, runZero)
- Perplexity Sonar: intruder first (first choices: Intruder) (alternatives: Cortex Xpanse, Mandiant Attack Surface Management, UpGuard BreachSight)
- Grok 4.1 Fast: intruder first (first choices: Intruder) (alternatives: Bitsight, Qualys CyberSecurity Asset Management, Rapid7 Surface Command)
- Mistral Small: intruder first (first choices: Intruder) (alternatives: Bitsight, Detectify)
- DeepSeek V4 Flash: intruder first (first choices: Intruder) (alternatives: Censys ASM, CrowdStrike Falcon Surface, CyCognito, Microsoft Defender External Attack Surface Management)
- Llama 4 Maverick: intruder first (first choices: Intruder) (alternatives: Bitsight, Qualys)
- Qwen 3.7 Flash: intruder first (first choices: Intruder) (alternatives: Rapid7)
- Kimi K2: intruder first (first choices: Intruder) (alternatives: Detectify, Microsoft Defender External Attack Surface Management, UpGuard BreachSight)
- GLM 4.7 FlashX: intruder first (first choices: Intruder) (alternatives: CyCognito, UpGuard BreachSight)
- MiniMax M2.5: intruder first (first choices: CyCognito, Intruder) (alternatives: Mandiant Attack Surface Management)
- Muse Glimmer 30B: intruder first (first choices: Intruder, UpGuard BreachSight) (alternatives: Attaxion, Halo Security)
- GPT-6 Luna: microsoft defender external attack surface management first (first choices: Microsoft Defender External Attack Surface Management) (alternatives: Censys ASM, CrowdStrike Falcon Exposure Management, Rapid7 Surface Command)
- Claude Haiku 4.5: neither first, one named (first choices: CyCognito) (alternatives: Hadrian, Halo Security, Intruder)
- GPT-5.4 mini: neither first, one named (first choices: UpGuard BreachSight) (alternatives: CyCognito, Intruder, Microsoft Defender External Attack Surface Management, Tenable Attack Surface Management)

## What the models said about Intruder

- "Basic scanners (e.g., some positioned as EASM like Intruder.io) discover assets but don't validate exploitability, leading to alert fatigue." (Grok 4.1 Fast, negative prompt, soft negative)
- "the strongest default pick is Intruder because multiple 2026 reviews describe it as best for medium-sized businesses and mid-market organizations" (Perplexity Sonar, direct prompt, first choice)
- "Intruder is likely the best starting point due to its transparent pricing, ease of use, and comprehensive features at a reasonable cost" (GLM 4.7 FlashX, direct prompt, first choice)

## What the models said about Microsoft Defender External Attack Surface Management

- "Microsoft’s native ASM is described as tightly integrated with Defender and Azure, so it may be less suitable if you need broad multi-cloud, SaaS, or heterogeneous coverage" (Perplexity Sonar, negative prompt, soft negative)
- "integrates deeply with Microsoft/Sentinel/Defender; limited third-party integration for non-Microsoft environments." (DeepSeek V4 Flash, negative prompt, soft negative)
- "while Microsoft Defender EASM is excellent at passive discovery, its active vulnerability scanning can be lacking" (Gemini 3.5 Flash, negative prompt, soft negative)
- "the best attack surface management (ASM) platform is Microsoft Defender External Attack Surface Management (EASM) if you already use Microsoft 365/E5" (GLM 4.7 FlashX, budget prompt, first choice)
- "I'd generally recommend Microsoft Defender External Attack Surface Management as the first tool to evaluate" (GPT-5.4 mini, paraphrase prompt, first choice)
- "I'd start with Microsoft Defender EASM—especially if you already use Azure or Microsoft security tools." (GPT-6 Luna, direct prompt, first choice)

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.