# Microsoft Defender XDR vs Stellar Cyber Open XDR: which do AI models recommend for XDR, October 2026

IT AI Recommendation Index, October 2026 Edition, Extended detection and response. Five of fourteen models named Microsoft Defender XDR first on the direct prompt; two named Stellar Cyber Open XDR. Page: https://it-ai-index.com/security/extended-detection-and-response/microsoft-defender-xdr-vs-stellar-cyber-open-xdr/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Microsoft Defender XDR | 40% | #1 of 10 | 15% | 61 | 14 of 14 |
| Stellar Cyber Open XDR | 4% | #5 of 10 | 0% | 13 | 8 of 14 |

## The direct prompt, model by model

- GPT-5.4 mini: microsoft defender xdr first (first choices: CrowdStrike Falcon Insight XDR, Microsoft Defender XDR) (alternatives: Palo Alto Networks Cortex XDR)
- Grok 4.1 Fast: microsoft defender xdr first (first choices: Microsoft Defender XDR) (alternatives: CrowdStrike Falcon Insight XDR, SentinelOne Singularity, Sophos Intercept X)
- GLM 4.7 FlashX: microsoft defender xdr first (first choices: Microsoft Defender XDR) (alternatives: CrowdStrike Falcon Insight XDR, Palo Alto Networks Cortex XDR, SentinelOne Singularity, Sophos Intercept X)
- MiniMax M2.5: microsoft defender xdr first (first choices: Microsoft Defender XDR) (alternatives: CrowdStrike Falcon Insight XDR, Sophos Intercept X)
- GPT-6 Luna: microsoft defender xdr first (first choices: Microsoft Defender XDR) (alternatives: CrowdStrike Falcon Insight XDR, Palo Alto Networks Cortex XDR)
- Llama 4 Maverick: stellar cyber open xdr first (first choices: Sophos Intercept X, Stellar Cyber Open XDR) (alternatives: Microsoft Defender XDR)
- Muse Glimmer 30B: stellar cyber open xdr first (first choices: Sophos Intercept X, Stellar Cyber Open XDR) (alternatives: Bitdefender GravityZone XDR, Microsoft Defender XDR, Ontinue)
- Claude Haiku 4.5: neither first, one named (first choices: Sophos Intercept X) (alternatives: Microsoft Defender XDR, Rapid7 InsightIDR, SentinelOne Singularity)
- Gemini 3.5 Flash: neither first, one named (first choices: Sophos Intercept X, Sophos MDR) (alternatives: Cynet 360 Auto XDR, Microsoft Defender for Business / Defender XDR, SentinelOne Singularity, Stellar Cyber Open XDR)
- Perplexity Sonar: neither first, one named (first choices: Sophos Intercept X) (alternatives: SentinelOne Singularity, Stellar Cyber Open XDR)
- Mistral Small: neither first, one named (first choices: Sophos Intercept X) (alternatives: Stellar Cyber Open XDR)
- DeepSeek V4 Flash: neither first, one named (first choices: Sophos Intercept X) (alternatives: CrowdStrike Falcon Insight XDR, Microsoft Defender XDR, SentinelOne Singularity, Stellar Cyber Open XDR)
- Qwen 3.7 Flash: neither first, one named (first choices: Sophos Intercept X) (alternatives: Microsoft Defender XDR, SentinelOne Singularity)
- Kimi K2: neither named (first choices: SentinelOne Singularity, Sophos Intercept X) (alternatives: Microsoft Defender for Endpoint)

## What the models said about Microsoft Defender XDR

- "it is recommended to avoid buying into the full enterprise-grade Microsoft Defender XDR" (Llama 4 Maverick, negative prompt, hard negative)
- "Microsoft documents that some Defender TVM tables are not ingested into Microsoft Sentinel, so queries can behave differently across platforms." (GPT-5.4 mini, negative prompt, soft negative)
- "its correlation capabilities deteriorate significantly if your environment isn't fully integrated into the Microsoft 365 and Azure ecosystem" (Gemini 3.5 Flash, negative prompt, soft negative)
- "Microsoft Defender XDR is the most cost-effective entry into enterprise-grade XDR for organizations already running Microsoft 365." (Claude Haiku 4.5, budget prompt, first choice)
- "I'd recommend starting with Microsoft Defender XDR if you're already in the Microsoft ecosystem, or CrowdStrike Falcon" (MiniMax M2.5, paraphrase prompt, first choice)
- "For a company on a tight budget, the best value is usually Microsoft Defender—especially if you already use Microsoft 365." (GPT-6 Luna, budget prompt, first choice)

## What the models said about Stellar Cyber Open XDR

- "Stellar Cyber Open XDR is repeatedly highlighted for mid-market teams needing enterprise capabilities without vendor lock-in" (Muse Glimmer 30B, direct prompt, first choice)
- "such as Sophos Intercept X or Stellar Cyber Open XDR. These platforms are designed for mid-market teams" (Llama 4 Maverick, 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.