# ChatGPT vs Glean: which do AI models recommend for Enterprise AI, October 2026

IT AI Recommendation Index, October 2026 Edition, Enterprise AI assistants. Two of fourteen models named ChatGPT first on the direct prompt; one named Glean. Page: https://it-ai-index.com/it-data/enterprise-ai-assistants/chatgpt-vs-glean/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| ChatGPT | 25% | #1 of 7 | 21% | 47 | 14 of 14 |
| Glean | 6% | #5 of 7 | 6% | 16 | 7 of 14 |

## The direct prompt, model by model

- GPT-5.4 mini: chatgpt first (first choices: ChatGPT) (alternatives: Gemini for Workspace, Google Gemini, Microsoft Copilot)
- GPT-6 Luna: chatgpt first (first choices: ChatGPT) (alternatives: Google Workspace with Gemini, Microsoft 365 Copilot)
- Gemini 3.5 Flash: glean first (first choices: Glean, Microsoft 365 Copilot) (alternatives: 1mind, ChatGPT Team or Enterprise, Moveworks)
- Perplexity Sonar: neither first, one named (first choices: HubSpot with Breeze AI) (alternatives: Artisan, Glean, Microsoft 365 Copilot, Regie.ai, Writer, ZoomInfo)
- Grok 4.1 Fast: neither first, one named (first choices: Microsoft Copilot) (alternatives: Glean, Gong, Salesforce Einstein)
- Mistral Small: neither first, one named (first choices: Gong) (alternatives: ChatGPT, HubSpot AI, Monday.com Revenue AI OS)
- DeepSeek V4 Flash: neither first, one named (first choices: Microsoft 365 Copilot) (alternatives: ChatGPT, Claude, Glean Assistant, Google Gemini)
- Claude Haiku 4.5: neither named (first choices: 1mind, AI Hive) (alternatives: Gong, Microsoft Copilot)
- Llama 4 Maverick: neither named
- Qwen 3.7 Flash: neither named (first choices: HubSpot Breeze AI) (alternatives: Apollo, Chorus, Clay, Gong, Microsoft Copilot, Salesforce Einstein, Slack AI)
- Kimi K2: neither named (first choices: Microsoft 365 Copilot) (alternatives: Gong)
- GLM 4.7 FlashX: neither named (first choices: Microsoft 365 Copilot) (alternatives: Gong, HubSpot Breeze AI, Monday CRM with AI)
- MiniMax M2.5: neither named
- Muse Glimmer 30B: neither named (first choices: HubSpot Breeze AI) (alternatives: Gong Revenue AI OS, Intercom, Respond.io)

## What the models said about ChatGPT

- "Multiple major companies have banned it after data leaks" (MiniMax M2.5, negative prompt, hard negative)
- "several major enterprise platforms—including ChatGPT Enterprise, Gemini Enterprise, and Salesforce Einstein—can be tricked into leaking data" (Qwen 3.7 Flash, negative prompt, soft negative)
- "tools that look like consumer ChatGPT/Claude/Gemini-style accounts but are used in a company setting without enterprise controls" (Perplexity Sonar, negative prompt, soft negative)
- "ChatGPT Enterprise - extends OpenAI's chatbot with higher-speed access, longer context windows, and enterprise controls like single sign-on (SSO) and admin consoles" (Llama 4 Maverick, paraphrase prompt, first choice)
- "ChatGPT Business remains the most balanced option for customer support drafting, creative brainstorming, and general workflow acceleration." (Qwen 3.7 Flash, budget prompt, first choice)
- "My default recommendation for a mid-sized B2B company is ChatGPT Enterprise because it is the most versatile company-wide assistant" (Perplexity Sonar, paraphrase prompt, first choice)

## What the models said about Glean

- "Avoid over-investing in "enterprise-only" platforms like Glean or Moveworks" (Kimi K2, paraphrase prompt, soft negative)
- "Best Overall for Connected Knowledge & Search: Glean ... Glean is the gold standard." (Gemini 3.5 Flash, paraphrase prompt, first choice)
- "Glean: Best for Cross-Platform Knowledge & "Universal Search"" (Gemini 3.5 Flash, direct prompt, first choice)
- "Top Recommendation: Glean" (DeepSeek V4 Flash, paraphrase 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.