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

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

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Microsoft Defender External Attack Surface Management | 10% | #3 of 12 | 18% | 39 | 14 of 14 |
| Tenable Attack Surface Management | 2% | #7 of 12 | 17% | 18 | 8 of 14 |

## The direct prompt, model by model

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

## 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)

## What the models said about Tenable Attack Surface Management

- "The EASM component is more limited than dedicated EASM specialists, and works best alongside a dedicated EASM tool rather than instead of one" (Claude Haiku 4.5, negative prompt, soft negative)
- "the platform can be overly complex ("heavy") and expensive relative to the immediate value provided. It is often viewed as overkill" (Qwen 3.7 Flash, direct prompt, soft negative)
- "Their ASM offering is often viewed as a secondary addition to their core product" (Qwen 3.7 Flash, negative prompt, soft negative)
- "the best value pick is usually Tenable One Attack Surface Management" (GPT-5.4 mini, budget prompt, first choice)
- "Best For: Teams that prefer hard technical data and CVSS scores over abstract "risk scores," particularly for compliance-heavy industries." (Qwen 3.7 Flash, comparative prompt, alternative)
- "if you want attack surface management as part of a broader exposure management stack" (GPT-5.4 mini, direct prompt, alternative)

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.