# GrowthBook vs Optimizely CMS: which do AI models recommend for experimentation, October 2026

GTM AI Recommendation Index, October 2026 Edition, Experimentation and personalization. Zero of fourteen models named GrowthBook first on the direct prompt; zero named Optimizely CMS. Page: https://gtm-ai-index.com/marketing/experimentation-and-personalization/growthbook-vs-optimizely-cms/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| GrowthBook | 15% | #3 of 12 | 8% | 25 | 12 of 14 |
| Optimizely CMS | 7% | #5 of 12 | 47% | 55 | 14 of 14 |

## The direct prompt, model by model

- GPT-6 Luna: neither first, one named (first choices: VWO) (alternatives: Optimizely CMS)
- Claude Haiku 4.5: neither named (first choices: VWO) (alternatives: Mutiny)
- GPT-5.4 mini: neither named (first choices: Kameleoon) (alternatives: Optimizely Web Experimentation, VWO Testing)
- Gemini 3.5 Flash: neither named (first choices: VWO) (alternatives: Abmatic AI, Croct, Ploy, PostHog)
- Perplexity Sonar: neither named (first choices: VWO) (alternatives: Personyze)
- Grok 4.1 Fast: neither named (first choices: VWO) (alternatives: AB Tasty, Convert Experiences, Mutiny)
- Mistral Small: neither named (first choices: Optimizely Web Experimentation, Personyze) (alternatives: Kameleoon)
- DeepSeek V4 Flash: neither named (first choices: Convert Experiences, Mutiny) (alternatives: Abmatic AI, VWO)
- Llama 4 Maverick: neither named (first choices: Optimizely Web Experimentation) (alternatives: HubSpot, Kameleoon, Personyze)
- Qwen 3.7 Flash: neither named (first choices: VWO) (alternatives: AB Tasty, Convert Experiences, Mutiny)
- Kimi K2: neither named (first choices: VWO) (alternatives: Intellimize, Mutiny, PostHog)
- GLM 4.7 FlashX: neither named (first choices: Mutiny) (alternatives: Abmatic AI, VWO)
- MiniMax M2.5: neither named (first choices: Markettailor, VWO) (alternatives: AB Tasty, Mutiny)
- Muse Glimmer 30B: neither named (first choices: Mutiny, VWO) (alternatives: HubSpot, Kameleoon, Personyze)

## What the models said about GrowthBook

- "requiring less technical overhead than developer-heavy solutions like GrowthBook" (Qwen 3.7 Flash, paraphrase prompt, soft negative)
- "Open-source, requires more technical setup" (Kimi K2, scale prompt, soft negative)
- "GrowthBook and PostHog are free to start, and both are open-source so that you can self-host them, making them excellent choices if you want zero upfront costs." (Claude Haiku 4.5, budget prompt, first choice)
- "The Alternative: If your program is engineering-led, opt for server-side testing or warehouse-native platforms (such as GrowthBook, Eppo, or PostHog)" (Gemini 3.5 Flash, negative prompt, first choice)
- "GrowthBook is open-source A/B testing and feature-flagging platform, and it is the pick when budget is your tightest constraint." (Muse Glimmer 30B, budget prompt, first choice)

## What the models said about Optimizely CMS

- "more enterprise-y, pricier ~$36K/yr min, dev-heavy). Avoid if mid-market budget/timeline constrained." (Grok 4.1 Fast, direct prompt, hard negative)
- "What to avoid at this size: Optimizely is enterprise and engineering-led... typically overkill" (Muse Glimmer 30B, paraphrase prompt, hard negative)
- "Avoid enterprise tools like Optimizely or Adobe Target—they typically start at $36k+/year." (DeepSeek V4 Flash, budget prompt, hard negative)
- "I'd lean toward VWO or Optimizely depending on your budget... Optimizely provides more advanced personalization if you have the budget." (Claude Haiku 4.5, paraphrase prompt, first choice)
- "Leader in Digital Experience Platforms (DXP)... For Enterprise Organizations: Optimizely, Dynamic Yield, or Monetate offer comprehensive suites" (MiniMax M2.5, comparative prompt, first choice)
- "The heavyweight, "do-everything" enterprise platform... Recognized as a Leader in the *Gartner Magic Quadrant for Personalization Engines*" (Gemini 3.5 Flash, comparative 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.