# HAProxy vs NGINX: which do AI models recommend for load balancers, October 2026

IT AI Recommendation Index, October 2026 Edition, Load balancers. Three of fourteen models named HAProxy first on the direct prompt; four named NGINX. Page: https://it-ai-index.com/network/load-balancers/haproxy-vs-nginx/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| HAProxy | 29% | #1 of 13 | 5% | 58 | 14 of 14 |
| NGINX | 15% | #3 of 13 | 4% | 53 | 14 of 14 |

## The direct prompt, model by model

- Grok 4.1 Fast: both first (first choices: HAProxy, NGINX) (alternatives: AWS ALB, Azure Load Balancer, Cloudflare Load Balancing, GCP Cloud Load Balancing, Progress Kemp LoadMaster)
- Perplexity Sonar: haproxy first (first choices: HAProxy) (alternatives: AWS Elastic Load Balancing, Azure Application Gateway)
- Kimi K2: haproxy first (first choices: HAProxy, Progress Kemp LoadMaster) (alternatives: F5 NGINX)
- Claude Haiku 4.5: nginx first (first choices: AWS Elastic Load Balancing, Azure Load Balancer, NGINX) (alternatives: Citrix ADC, F5, HAProxy)
- Qwen 3.7 Flash: nginx first (first choices: AWS Elastic Load Balancing, Azure Application Gateway, NGINX) (alternatives: Cloudflare Load Balancing, HAProxy)
- GLM 4.7 FlashX: nginx first (first choices: NGINX, Progress Kemp LoadMaster) (alternatives: F5 BIG-IP, HAProxy)
- Gemini 3.5 Flash: neither first, one named (first choices: Cloudflare Load Balancing) (alternatives: AWS Elastic Load Balancing, Azure Application Gateway, HAProxy, NGINX, Progress Kemp LoadMaster)
- Mistral Small: neither first, one named (first choices: Cloudflare Load Balancing) (alternatives: HAProxy, Progress Kemp LoadMaster, VMware Avi Load Balancer)
- DeepSeek V4 Flash: neither first, one named (first choices: Progress Kemp LoadMaster) (alternatives: AWS Application Load Balancer, Cloudflare Load Balancing, HAProxy, NGINX)
- MiniMax M2.5: neither first, one named (first choices: Progress Kemp LoadMaster) (alternatives: AWS Elastic Load Balancing, Azure Load Balancer, Cloudflare Load Balancing, GCP Cloud Load Balancing, NGINX)
- Muse Glimmer 30B: neither first, one named (first choices: Progress Kemp LoadMaster) (alternatives: AWS Elastic Load Balancing, Azure Load Balancer, Cloudflare Load Balancing, HAProxy, NGINX)
- GPT-5.4 mini: neither named (first choices: Application Load Balancer) (alternatives: Azure Load Balancer, Google Cloud's Application Load Balancer, Network Load Balancer)
- Llama 4 Maverick: neither named
- GPT-6 Luna: neither named (first choices: AWS Application Load Balancer) (alternatives: Azure Application Gateway, Azure Load Balancer, Cloudflare Load Balancing, Google Cloud Application Load Balancer, Google Cloud Network Load Balancer)

## What the models said about HAProxy

- "Open‑source solutions that are no longer actively maintained (e.g., very old versions of HAProxy, Nginx...) | Unpatched CVEs" (GLM 4.7 FlashX, negative prompt, soft negative)
- "consider a third-party option like F5 or HAProxy, but that adds more ops overhead" (GPT-5.4 mini, direct prompt, soft negative)
- "running them on under-powered virtual machines (like a $5/mo VPS) creates a bottleneck" (Qwen 3.7 Flash, negative prompt, soft negative)
- "If you have standard web apps or APIs: Go with HAProxy. It has the broadest adoption, most documentation, and best performance for the price (free)." (Kimi K2, budget prompt, first choice)
- "The performance leader — handles millions of requests per second with sub-millisecond latency... HAProxy is the performance benchmark." (DeepSeek V4 Flash, comparative prompt, first choice)
- "Fastest and most stable - used by GitHub, Reddit, Stack Overflow ... High-performance, mission-critical | HAProxy" (Kimi K2, comparative prompt, first choice)

## What the models said about NGINX

- "running them on under-powered virtual machines ... creates a bottleneck" (Qwen 3.7 Flash, negative prompt, soft negative)
- "Don't use Nginx for complex load balancing - It's a web server first" (Kimi K2, negative prompt, soft negative)
- "A well-run software load balancer (HAProxy or NGINX) or a cloud-managed service will give you the performance, flexibility, and cost-effectiveness you need" (DeepSeek V4 Flash, scale prompt, first choice)
- "a cloud-based load balancer (if you're in the cloud) or Nginx (if on-premises) represents the best balance of cost, performance, and ease of management" (Claude Haiku 4.5, direct prompt, first choice)
- "The Industry Standard (Flexible & Powerful): NGINX ... If you are moving toward a microservices/Kubernetes architecture, transition to NGINX Ingress." (Qwen 3.7 Flash, 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.