CustomGPT.ai vs Glean: Which AI Platform Is Right for Your Business?
CustomGPT.ai builds AI agents that answer from your own content, including for people outside your staff, starting at $99 a month. Glean is an enterprise AI platform that lets employees search and chat across 275+ workplace apps. It is built for large companies, and Vendr, a third-party buying platform, reports a median contract near $99,000 a year. If your questions come from members, customers or prospects, not employees, that difference decides the choice.
Quick decision guide
Choose CustomGPT.ai
you want an assistant that members, customers or prospects can use on your website or portal, cited answers from your own content, and a price you can test for a week before you commit.
Choose Glean
you are a large organization that wants every employee to search across dozens of internal systems, such as Slack, Jira and Salesforce, with each person's permissions applied to every result.
About CustomGPT.ai
CustomGPT.ai lets organizations build AI agents trained on their own content. It is based in Needham, Massachusetts. Its agents learn from 1,400+ document formats, website crawling, and connectors for SharePoint, Google Drive, OneDrive, Confluence and Notion, and they support 92 languages. CustomGPT.ai holds SOC 2 Type 2 and is GDPR compliant. You share an agent through a website widget, a CMS plugin, Zapier or the API, so people outside your staff can use it.
Starting price: $99/mo (Standard, or $89/mo on annual billing). Premium is $499/mo ($449/mo on annual billing). Enterprise is custom. A 7-day free trial applies to every plan, and eligible organizations can get 20% off annual plan. See customgpt.ai/pricing for current details.
Starting Price
About Glean
Glean was founded in 2019 and is headquartered in Palo Alto, California. It sells a work AI platform with search, an assistant and agents, and lists 275+ out-of-the-box connectors to enterprise apps. It reported $300 million in annual recurring revenue in May 2026 (self-reported). Glean does not publish prices on its pricing page, which points to a demo request. Vendr, a software-buying platform, reports a median contract of $98,890 a year across 174 purchases (page updated February 2026).
Not published.
Starting Price
Key Differences at a Glance
Glean is strong where your users are employees and your content sits in many internal systems. If you answer people outside your staff, you will run into four differences.
- Who the users are: Glean is built around your employees' sign-ins. Its developer kit has a guest option for search, but Glean's pages do not say whether guests can chat.
- Where answers come from: Glean's default mode picks the most relevant sources for each question, which can include web results when an admin turns them on, and a user can switch to company sources for a single question. CustomGPT.ai answers from your approved content and says "I don't know" when the answer is not there.
- Languages: Glean lists 10 languages as generally available across keyword search, semantic search and its interface. CustomGPT.ai supports 92.
- Price and starting up: CustomGPT.ai starts at $99 a month with a 7-day free trial. Glean's pricing page points to a demo request, and Vendr reports minimums often starting around 100 to 250 users.
What this comparison covers
Every Glean fact on this page comes from Glean's public website and documentation, checked on 27 October 2026. Glean publishes no prices, so the only cost figures here come from a third party and are labeled that way. Where Glean's pages say nothing on a point, the table says so. Plan names and prices change, so confirm them on each vendor's pricing page before you decide.
Detailed Feature Comparison
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Launch fully-integrated custom AI agents
Increase efficiency, drive revenue, and delight customers with instant answers from your information
Final Verdict: Glean vs CustomGPT.ai
Glean is a capable platform for searching across a large company's internal systems. CustomGPT.ai fits when the people asking are outside your staff and the answers live in content you have approved. Many organizations have both needs: scope staff-wide enterprise search as its own project, and start the member- or customer-facing assistant on CustomGPT.ai's free trial.
When to choose CustomGPT.ai
- Your audience is members, customers or prospects, not only employees.
- You have fewer staff than the 100 to 250 user minimums Vendr reports for Glean, or a budget measured in hundreds of dollars a month.
- People ask in many languages. CustomGPT.ai supports 92.
- You want to test on your own content in a week, not wait for a demo.
When to choose Glean
- You have hundreds of staff working across many internal systems and want one search for all of them.
- You need permission-aware search across tools like Slack, Jira and Salesforce, or you need Glean to run inside your own cloud account.
Migration & Switching Considerations
Glean publishes no prices, and Vendr reports minimums of 100 to 250 users, so a side-by-side trial can cost real money before you learn anything. Start with CustomGPT.ai's 7-day free trial on the questions your members or customers ask most.
Pricing Comparison Summary
CustomGPT.ai's plans and prices are in the table above, and every plan includes API access. Glean does not publish prices. Vendr's third-party buyer data (February 2026) shows a median of $98,890 a year, which is not a Glean quote. Ask Glean for a written quote at your seat count before comparing.
Our Recommendation Process
- Write 20 questions people really ask. Include at least 10 that are answered only inside a PDF or handbook.
- Run them on CustomGPT.ai's free trial. Ask Glean whether a trial or proof of concept is available and what it costs.
- Test who can ask. Can someone outside your staff reach the assistant, and can they chat, not only search?
- Check where answers come from. Ask each vendor whether an answer can draw on anything beyond your approved content.
- Get a written price for your headcount. Compare the same scope on both.
For most organizations, the deciding check is step 3: whether people outside your staff can reach the assistant and chat with it.
Next steps
Ready to decide? Run both tools on your own documents before you commit.
Use cases
Here's how teams like yours are leveraging CustomGPT.ai
Automate and resolve 93%+ of customer inquiries, instantly
Reduce ticket volume and support costs with AI agents that instantly resolve inquiries—freeing your team to focus on high-value tasks
Answer every new-starter question on day one
Turn handbooks, policies and recorded sessions into an agent that answers new joiners directly, in their own words, from your own material.
Work faster with instant, accurate information
Give team members exactly the right information — no more, no less — with use-specific assistants and role-based access across everything you have already written down.
Ask your own library the question
Point an agent at 1,400+ supported file types and dozens of integrations, and get answers that come only from your approved sources, each one linked back to where it came from.
See what your visitors are actually asking
Every conversation is a record of what people came looking for. Read the questions your site is being asked and what it managed to answer.
Keep your team current on the market
Collect the reports, transcripts and pages your team relies on into one agent, so a market question gets a sourced answer instead of a search.
Frequently Asked Questions
Can members or customers use Glean?
Glean is built for employees. Its sign-in runs through single sign-on, and its Web SDK offers anonymous or guest access to search. Glean’s pages do not say whether guests can use chat. CustomGPT.ai agents are shared on your website or portal for outside users to use.
How much does Glean cost?
Glean does not publish prices. Vendr, a third-party buying platform, reports a median contract of $98,890 a year across 174 purchases (page updated February 2026) and says Glean often requires 100 to 250 users. CustomGPT.ai starts at $99 a month, with a 7-day free trial.
Does Glean answer only from our content?
Not always. Glean’s default “All Knowledge” mode picks the most relevant sources for each question, and that can include web results when an admin has enabled web search. A user can choose “Company sources only” for a question. A separate “No sources” mode answers from the model’s built-in knowledge. CustomGPT.ai answers from your approved content and says “I don’t know” when the answer is not there.
Which is better if I need one AI system for employees and for customers or members?
Glean covers employees well, but its sign-in is built around your own staff. CustomGPT.ai covers staff and outside users from one set of content. A state bar association of about 15,000 lawyers runs nine agents on one contract, and members reach the assistant through single sign-on at the association’s own identity provider. If you also want staff-wide search across Slack, Jira and similar tools, treat that as a separate Glean-style project.
What can members see when an answer cites a source?
You choose how an answer shows its source: numbered references inside the answer, a list after it, or both. You can set the header and label text. Image citations show the related image under the answer, and website sources can show a preview image. Both are on every plan. On Enterprise, PDF Citations open the cited PDF at the cited page, with the passage highlighted for text-based PDFs. A setting can show only the cited page and the page on either side. A “Limited” label marks the hidden pages, and you can make that label a link to a page you choose, such as where members join or buy. CustomGPT.ai also tracks how often citations and links are shown and clicked.
How do the security setups differ?
Both list independent security credentials, compared in the table above. The practical difference is access. Glean applies each employee’s existing permissions across your connected apps. A CustomGPT.ai agent answers only from the content you load into it, and each agent is isolated as its own data silo.
Is CustomGPT.ai a Glean alternative?
Yes, for answering members, customers and prospects, and for staff searching content you have loaded. It does not replace Glean’s search across dozens of internal workplace apps. For more options, see our roundup of Glean alternatives.
Can't we just use ChatGPT or Claude for this instead?
ChatGPT and Claude are general assistants. Building this on top of them means you design the document retrieval, the source citations and the “I don’t know” behavior yourself, then put the result through a security review. CustomGPT.ai includes those: responses come from your own content and link to their source.
What would an association use CustomGPT.ai for?
A member asks “What is the renewal deadline for my certification?” and the assistant answers from your certification handbook and links the source. A US national professional society for pharmacists runs nine assistants this way, one for each job that needed one, including drug information, residency programs, advocacy and internal staff support. All nine run on a single entry-level subscription, and in three years the society has raised zero support tickets.
