SIEM vs Agentic SOC
What a SIEM does. What an Agentic SOC does instead.
A SIEM aggregates data and lets analysts search it. An Agentic SOC ingests the same data and then triage, investigates, and responds automatically. Here's the concrete architectural difference and when to replace vs. augment.
Head-to-head capability comparison
| Capability | Traditional SIEM | Agentic SOC (ManySignal) |
|---|---|---|
| Primary function | Data aggregation and search | Detection-to-response pipeline |
| Alert handling | Surfaces raw events to analyst queue | Triage agent verdicts every alert before analyst sees it |
| Investigation | Analyst manually pivots across tools | Investigate agent assembles timeline in 4 minutes |
| Response | Requires SOAR integration | Approval-gated response built in |
| Behavioral analytics | Add-on module (UEBA) | Built in — baselines per entity, no extra tool |
| Detection authoring | Manual rule writing in SPL or AQL | AI-assisted with backtest validation |
| Pricing | Per GB ingested — grows with log volume | Per asset — predictable as environment scales |
| Retention cost | Hot storage expensive beyond 30–90 days | 12 months hot included in flat price |
| SOAR requirement | Required for response automation | None — response is native |
| Analyst experience | Reviews 200+ raw alerts per day | Reviews 10–20 pre-packaged verdicts per day |
When to replace vs. augment
Replace your SIEM when...
- Your SIEM spend is growing faster than your alert coverage
- You're paying per-GB and volume keeps increasing
- Your team spends most of their time triaging raw events
- You have a separate SOAR tool with unmaintained playbooks
- Your current SIEM is Splunk Enterprise or QRadar
- You have a UEBA module as a separate license
- Your MTTR is measured in hours, not minutes
Augment your SIEM when...
- You're in a multi-year Microsoft Sentinel commitment
- Your compliance framework requires specific SIEM architecture
- Your data residency rules prevent moving the data layer
- Your team lacks capacity for an 8-week migration now
- You want to trial agentic triage before full replacement
- Your SIEM is heavily customized with critical dashboards
- You're in a regulated industry with approved SIEM vendors
SIEM vs Agentic SOC — common questions
Can an Agentic SOC exist without a SIEM?
Yes. ManySignal ingests telemetry directly from your data sources — EDR, IdP, cloud providers, network — and processes it through the full detection-to-response pipeline without requiring a SIEM in the middle. The platform includes the data layer (ingestion, normalization, storage, and search) that a SIEM traditionally provides.
Should we replace our SIEM with an Agentic SOC or augment it?
If your SIEM is primarily Splunk or QRadar, replacement is typically the right choice — the cost savings are substantial and the agentic platform subsumes all SIEM functionality. If you're using Sentinel inside a Microsoft-heavy environment (Azure Defender, M365 Defender), augmentation is often more pragmatic — ManySignal adds agentic triage and response on top of Sentinel's findings without re-platforming the data.
Does an Agentic SOC require a SIEM for long-term data storage?
No. ManySignal stores 12 months of telemetry in hot storage and unlimited data in cold storage. Long-term retention, compliance archival, and forensic data access are all supported within the platform. There is no requirement for a separate SIEM as the system of record.
What does 'agentic' mean vs. 'AI-assisted'?
AI-assisted tools use AI to help humans work faster — copilot features, suggested queries, recommended actions. An Agentic SOC uses AI agents that operate autonomously within configured policies to complete full workflows — triage an alert, investigate an incident, dispatch a response — without human involvement at each step. Humans govern the policies and approve high-risk actions; agents execute the workflow.
If the Agentic SOC replaces SIEM, does it also replace SOAR?
Yes. The Agentic SOC replaces SIEM (data layer + detection), SOAR (automation and response), and UEBA (behavioral analytics) in a single platform. Most customers replacing Splunk are also replacing a SOAR tool (XSOAR or Splunk SOAR) at the same time, which is where the 60–70% total cost reduction comes from — replacing three tools with one.
Which path is right for your environment?
30-minute assessment. Share your current SIEM, team size, and top pain points. We'll recommend replace or augment — with a specific plan for either path.