Zendesk recently announced its acquisition of Unleash, an Israeli AI-powered enterprise search startup. Unleash boasts over 70 connectors to popular platforms like Google Drive, Confluence, and SharePoint, offering "permission-based RAG" (Retrieval Augmented Generation) and AI agents integrated within Slack and Microsoft Teams. This functionality might sound familiar, drawing parallels to the capabilities offered by Glean, a prominent player in the enterprise search market.

However, Zendesk's strategy isn't a direct head-on competition with Glean. Understanding this nuance is crucial for founders and investors navigating the evolving AI landscape.

Understanding Glean's Market Dominance

Glean has experienced remarkable growth, solidifying its position as a leader in horizontal enterprise search:

  • $7.2 billion valuation as of June 2025, a significant jump from $4.6 billion just nine months prior.
  • Estimated $200 million+ ARR by November 2025, up from $100 million at fiscal year-end January 2025.
  • Over 800 employees.
  • 100+ SaaS connectors, including Google Workspace, Microsoft 365, Slack, and Salesforce.
  • An enterprise knowledge graph that personalizes search results for each user.
  • An AI Agents platform powering over 100 million agent actions annually.

Glean's core value proposition addresses a common enterprise challenge: knowledge scattered across dozens of SaaS applications, leading to employees wasting significant time searching for information. Glean provides a unified, AI-powered search layer that spans all these systems, complete with built-in permission controls. Its impressive client roster includes Databricks, Canva, Confluent, Duolingo, and T-Mobile, with initial annual contract values (ACVs) ranging from $100,000 to $500,000, and Fortune 500 deals exceeding $5 million annually. This clearly positions Glean as a horizontal enterprise search solution, designed to search everything for everyone across an entire organization.

Zendesk's Strategic Focus with Unleash

Zendesk's acquisition of Unleash, however, targets a different segment: employee service, rather than general enterprise search. The key insight comes from Zendesk's President of Product, Engineering, and AI:

“As organizations rapidly adopt AI, rethinking how they deliver internal employee support is becoming mission-critical. Zendesk’s acquisition of Unleash puts AI directly in the flow of work, delivering secure, permission-based answers from across company systems so employees get instant self-service with seamless handoffs to human experts when needed.”

This statement clarifies Zendesk's intent: to enhance IT help desks, HR service desks, and internal support ticket resolution. It's not about helping a marketing team locate a Q3 strategy deck, but rather streamlining internal support queries. Zendesk's strategy here involves:

  1. Owning the end-to-end employee service workflow: From case management and AI search/RAG to ticket routing and resolution analytics.
  2. Deploying AI agents in Slack/Teams to proactively answer common employee questions before a formal ticket is even created.
  3. Reducing internal support costs while simultaneously improving response times.

This approach defines a vertical application of enterprise search, specifically tailored for employee support within the context of service tickets, complete with built-in escalation paths.

The Bundling vs. Best-of-Breed Battle

This acquisition highlights a classic strategic battle in the software industry: platform bundling versus best-of-breed solutions.

Glean's vulnerability lies in its nature as a standalone product, competing on being the absolute best at one specific function: enterprise search. However, as major platforms like Microsoft, Google, and now Zendesk integrate AI search capabilities into their existing offerings, Glean must continually justify its standalone value and separate purchase. In contrast, Zendesk's advantage stems from its established ownership of customer service and, increasingly, employee service workflows. Integrating AI-powered search makes its existing product ecosystem more robust and sticky. This eliminates the need for separate procurement processes or security reviews, allowing customers to simply "turn on this feature."

This strategy mirrors the playbook of other industry giants:

  • Salesforce acquired Slack and subsequently added AI search functionalities.
  • Microsoft has embedded Copilot across its entire suite of products.
  • ServiceNow has been building similar capabilities for IT service management for years.
  • Now, Zendesk applies this strategy to customer and employee service.

Zendesk's Expanding AI Portfolio

The Unleash acquisition is Zendesk's fifth AI-focused purchase in just 18 months, revealing a clear strategic pattern:

  1. Klaus (January 2024): AI-powered quality assurance and coaching.
  2. Ultimate (March 2024): AI agents for customer service automation.
  3. Local Measure (May 2025): AI-powered voice and contact center solutions.
  4. HyperArc (July 2025): Generative AI-powered analytics.
  5. Unleash (December 2025): Enterprise AI search.

Zendesk is systematically assembling an AI-native service platform, piece by piece. The underlying thesis is evident: AI will fundamentally transform how companies manage both customer and employee support, and Zendesk aims to own both critical workflows. Unleash serves as the crucial knowledge retrieval layer, making all other components of this integrated platform smarter and more efficient.

Why Unleash Was the Right Choice

Unleash (unleash.so), a Tel Aviv-based startup founded by Itay Itzhaki (who has a cybersecurity background and a track record of successful startup exits), brings several key capabilities to Zendesk:

  • Over 70 enterprise connectors to essential platforms like Google Drive, Confluence, SharePoint, and Slack.
  • Permission-based RAG, ensuring that search results respect user access rights.
  • Native AI agents designed for seamless integration with Slack and Microsoft Teams.
  • Built-in mechanisms for smooth handoffs to human experts when needed.
  • SOC 2 Type II certified and GDPR compliant, addressing critical enterprise security and compliance needs.

For Zendesk, Unleash solves a significant "cold start" problem. Developing 70+ enterprise connectors from scratch would be a multi-year undertaking. Acquiring Unleash immediately makes Zendesk competitive in the crucial area of connector count, which is vital for enterprise sales.

The Broader Race for the AI Knowledge Layer

Across the industry, a clear trend is emerging: every major enterprise platform is striving to embed AI-powered knowledge retrieval into their core workflows. This creates a fascinating dynamic between:

Pure-play enterprise search vendors:

  • Glean (valued at $7.2 billion, operating as a standalone solution).
  • Perplexity (expanding into enterprise search, directly competing with Glean).
  • Coveo, Sinequa, Lucidworks (established legacy players).

Platform bundlers:

  • Microsoft (with Copilot integrated across its ecosystem).
  • Google (offering Gemini Enterprise and Agentspace).
  • Amazon (with Q for Business and Quick Suite).
  • Salesforce (leveraging Einstein and Data Cloud).
  • ServiceNow (with Now Assist).
  • Zendesk (now enhanced with Unleash).

The central question for pure-play vendors like Glean is whether being the absolute best-of-breed is sufficient when a "good enough" solution comes bundled for free with an existing platform.

Implications for Founders and Businesses

For founders building in enterprise search:

  • The market is increasingly segmenting into horizontal (e.g., Glean) and vertical (e.g., Zendesk's approach) plays.
  • Expect platform vendors to bundle "good enough" search capabilities into their products.
  • Differentiation will require either dramatically superior performance or serving a niche workflow untouched by major platforms.

For founders developing AI agents for employee service:

  • Zendesk has become a significantly more formidable competitor.
  • Their integrated stack now includes AI search (Unleash), AI agents (Ultimate), QA/coaching (Klaus), voice capabilities (Local Measure), and analytics (HyperArc).
  • Any new offering will need an exceptionally sharp and unique value proposition to compete.

For companies evaluating enterprise search solutions:

  • Prioritize evaluating workflows over just features.
  • If your organization already uses Zendesk, assess their bundled offerings before investing in a separate Glean solution.
  • For comprehensive, company-wide horizontal search, Glean remains a leader.
  • For specific employee service needs, Zendesk's integrated approach may offer greater value and efficiency.

The Bottom Line

Is Zendesk building a Glean competitor? The answer is nuanced: not exactly, but effectively a Glean-equivalent tailored for the employee service use case. By bundling this functionality into a platform that already manages that workflow, Zendesk isn't aiming to replace Glean for general enterprise search across an entire company. Instead, it seeks to make Glean unnecessary for IT and HR service desks.

This is a classic battle between platform providers and point solutions. Glean must continue to prove its standalone value, while Zendesk aims to demonstrate that its bundled solution is "good enough" and more convenient. My assessment is that Glean remains secure at the high end of the market for now. However, the middle market—comprising companies with 500 to 2,000 employees who may not require Glean's full horsepower—might increasingly opt for the integrated solutions provided by their existing service platforms. This is precisely the segment Zendesk is targeting, and with $2 billion in revenue and an aggressive AI merger and acquisition strategy, they are clearly committed to this path.