Managed detection and response (MDR) is a service; a security operations center (SOC) is a security operations function. They are not mutually exclusive choices: a business can run its own security team and use an MDR provider for continuous monitoring or frontline response. The right model depends on which work you need done, how much control you need to retain, and what your organization can sustainably operate.
What’s the difference between MDR and SOC?
MDR describes detection-and-response work delivered by an external provider. SOC describes the function that monitors and manages security operations. A traditional SOC is operated internally, but SOC capabilities can also be outsourced or shared. NIST provides glossary definitions for security operations center and managed detection and response.
So the practical comparison is usually between an internally operated SOC and an MDR service—not between two equivalent products. The labels alone do not tell you which systems are monitored, what actions a provider can take, or who leads an incident. Those details depend on the operating arrangement and contract.
How do the operating models compare?
These are typical patterns, not guarantees about every provider. Define each party’s responsibilities in the contract and operating procedures.
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| Decision area | Internal SOC | MDR service | Co-managed model |
|---|---|---|---|
| Who operates it? | Your organization hires, directs, and operates the team. | The provider performs contracted detection and response work. | Your organization and provider divide responsibilities; specify who owns each task. |
| Control and context | Your team has direct operational control and day-to-day organizational context. | The provider supplies operational capacity; your organization retains oversight and coordination duties. | Internal staff retain selected ownership while the provider supports operations. |
| Staff and tools | Your organization staffs coverage and buys, configures, and maintains tools. | The provider supplies analysts and may use its own platform or integrate with existing tools; packaging varies. | Outside support can reduce some operational burden while internal capability remains in place. |
| Response authority | Your organization sets and executes response decisions. | Permitted actions depend on the provider’s agreed permissions and service terms. | Divide authority in advance, including by incident severity and agreed playbooks. |
| Key question | Can we recruit, retain, equip, and manage the capability we need? | Which sources are covered, what response is included, and what remains our responsibility? | Which tasks will the provider own, and how will our team direct and review the work? |
When should you consider an internal SOC, MDR, or co-management?
Consider an internal SOC when control and internal context matter most
An internal team may suit an organization whose operating requirements, need for customization, or preference for direct control justify building and sustaining the staff and technology. That choice also makes the organization responsible for recruiting, training, managing, and equipping the team, including arranging the coverage it needs.
Consider MDR when you need outside detection-and-response capacity
MDR may fit when your organization cannot staff or maintain the needed security operations internally. Evaluate the actual coverage, response authority, and customer responsibilities—not just the service name—to confirm the provider can meet your needs.
Consider co-management when you want to retain ownership but need help operating
A co-managed service can support an organization that wants internal security ownership but needs help with monitoring or operating detection products. Gartner’s public abstract for its Market Guide for Co-Managed Security Monitoring Services, published April 14, 2025, describes services that can assist with operating, configuring, and maintaining threat-detection products with lower SOC staffing overhead. The abstract supports co-management as an option; it does not establish that every offering has the same scope or results.
How should you compare the real cost and capability?
There is no universal cost or organization-size rule established for choosing between these models. Compare scoped proposals with the full internal requirements: staffing, tools, infrastructure, training, and the coverage you need. Make sure the proposals cover comparable systems, hours, response authority, and responsibilities before comparing their totals.
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Do not treat a provider’s staffing or performance claim as an industry benchmark. For example, Expel’s August 26, 2026 guide includes claims about its own service; those statements are vendor-specific, not independent measures of typical MDR performance. Its comparison can help frame questions, but it cannot establish what another provider will deliver.
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CISA’s managed-service guidance recommends clear responsibility for hardening, detection, and incident response, as well as clear service and incident-notification terms. Its guidance also highlights provider access and supply-chain risks. Apply that diligence to the operating details below.
- Coverage: List the environments, endpoints, identities, cloud services, network sources, and logs that are included, along with exclusions.
- Hours and commitments: Confirm whether monitoring is continuous, the service hours, and any response times promised in the contract.
- Authority: Establish whether the provider may only alert or may also contain hosts, disable accounts, block activity, or make other changes. Define approval and emergency rules.
- Incident roles: Assign investigation, evidence preservation, recovery coordination, and incident communications. Decide who leads if an event occurs outside your staffed hours.
- Notification: Specify how quickly and through which channels the provider must notify you, and how escalation works if contacts are unavailable.
- Platforms and data: Identify required agents and platforms, license ownership, configuration and tuning responsibilities, retention, and your access to resulting data.
- Provider access: Identify provider staff, subcontractors, and other third parties with access; limit and review privileges.
- Testing and exit: Plan how you will exercise incident-response and recovery procedures together. Set terms for termination, data export, transition, and evidence retention.
For response planning, NIST SP 800-61 Rev. 3, published in April 2025, places incident-response recommendations within cybersecurity risk management and the NIST Cybersecurity Framework 2.0. Use that guidance alongside your service agreement so the provider’s role fits into your organization’s response and recovery plans.
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