# OT and IoT security for small business buyers: what AI models recommend, October 2026

IT AI Recommendation Index, October 2026 Edition. Asked as "OT security platform" and as "industrial and IoT device security tool", six framings each, to fourteen models with search on, on behalf of a small B2B company. Added to the October 2026 Edition on October 4, 2026; its answers are read by the distilled judge (ai-indexes-judge-qwen3-14b-run3), not the claude-opus-5 judge of the earlier categories. Page: https://it-ai-index.com/security/ot-and-iot-security/smb/

**Standing:** Microsoft Defender for IoT leads with 40% of first choices; verdict contested. 45 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| # | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | Microsoft Defender for IoT | 40% | 15% | 46 |
| 2 | Fortinet OT Security Platform | 7% | 0% | 18 |
| 3 | Tenable OT Security | 4% | 20% | 20 |
| 4 | Claroty xDome | 4% | 38% | 47 |
| 5 | Armis Centrix | 2% | 27% | 30 |
| 6 | Nozomi Networks Guardian | 2% | 38% | 39 |
| 7 | Dragos Platform | 2% | 51% | 37 |
| 8 | AWS IoT Device Defender | 0% | 9% | 11 |
| 9 | Forescout Vistaro Platform | 0% | 24% | 17 |

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: Fortinet Security Fabric; alternatives Cisco Cyber Vision, Forescout Vistaro Platform, Sectrio
- GPT-5.4 mini: Dragos Platform; alternatives Fortinet OT Security Platform
- Gemini 3.5 Flash: Fortinet OT Security Platform; alternatives Claroty xDome, Microsoft Defender for IoT, Tenable OT Security, runZero
- Perplexity Sonar: Microsoft Defender for IoT; alternatives Dragos Platform, Forescout Vistaro Platform, Fortinet OT Security Platform
- Grok 4.1 Fast: Microsoft Defender for IoT; alternatives Acreto, Fortinet OT Security Platform
- Mistral Small: MetaDefender OT Access, Tenable OT Security; alternatives Cisco Cyber Vision
- DeepSeek V4 Flash: Microsoft Defender for IoT; alternatives Claroty xDome, Nozomi Networks Guardian
- Llama 4 Maverick: no first choice
- Qwen 3.7 Flash: Tenable OT Security; alternatives Fortinet Security Fabric, ManageEngine OpUtils, Palo Alto Networks Prisma Access
- Kimi K2: Microsoft Defender for IoT; alternatives Armis Centrix, Tenable OT Security
- GLM 4.7 FlashX: Microsoft Defender for IoT; alternatives Armis Centrix, Claroty xDome, Dragos Platform, Fortinet OT Security Platform
- MiniMax M2.5: MetaDefender OT Access, Nozomi Networks Guardian
- GPT-6 Luna: Microsoft Defender for IoT; alternatives Armis Centrix, Claroty xDome, Nozomi Networks Guardian
- Muse Glimmer 30B: Acreto; alternatives Fortinet OT Security Platform, Network Perception NP-View

## Sources the answers cite

76 of 84 answers came back with a source list, from 14 of 14 models. Sites named in the most answers:

- us.fitgap.com: 41 answers, 72 citations
- sourceforge.net: 38 answers, 79 citations
- g2.com: 38 answers, 57 citations
- security.toolsinfo.com: 30 answers, 39 citations
- netwitness.com: 28 answers, 35 citations
- peerspot.com: 25 answers, 31 citations
- networkintelligence.ai: 24 answers, 24 citations
- comparitech.com: 19 answers, 20 citations

Pages named in the most answers:

- https://us.fitgap.com/search/ot-security-tools-software/small-business (34 answers)
- https://netwitness.com/blog/top-operational-technology-security-providers (27 answers)
- https://networkintelligence.ai/blogs/best-ot-security-services (24 answers)
- https://security.toolsinfo.com/c/ot-security/guide (23 answers)
- https://comparitech.com/net-admin/ot-security-vendors (19 answers)
- https://g2.com/categories/iot-security-solutions/small-business (18 answers)
- https://guideflow.com/blog/iot-security-solutions (18 answers)
- https://elisity.com/blog/leading-vendors-securing-ot-industrial-control-systems (17 answers)
- https://g2.com/categories/ot-security-tools (17 answers)
- https://opsiocloud.com/blogs/ot-security-vendor-selection-guide (17 answers)

## Warned against

- Dragos Platform: 19 of 37 labels negative. "Avoid enterprise-heavy like Dragos or Claroty initially (quote-based, often $10k+ starting, six figures for full)." (Grok 4.1 Fast, direct prompt)
- Claroty xDome: 18 of 47 labels negative. "Platforms to Avoid for Small B2B (Unless Budget Allows) | Claroty | ~$150,000 | Enterprise-focused, expensive per-asset licensing" (Kimi K2, direct prompt)
- Nozomi Networks Guardian: 15 of 39 labels negative. "Caution: High upfront costs (sensors/appliances), complex configuration, and resource-intensive management." (Grok 4.1 Fast, negative prompt)
- Microsoft Defender for IoT: 7 of 46 labels negative. "Noted as "very expensive" for small businesses in user reviews, with licensing scaling poorly for low device counts." (Grok 4.1 Fast, negative prompt)

## Record

- Method: https://it-ai-index.com/methodology/
- Raw judge labels and full responses: https://it-ai-index.com/data/
- License: CC BY 4.0. Cite as IT AI Recommendation Index, October 2026 Edition, it-ai-index.com.