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Microsoft Sentinel’s cost is driven almost entirely by one variable: how much data you send it. That is also why so many teams underestimate their bill. A few noisy log sources or one new integration can push daily ingestion up for weeks before anyone notices. And the first signal is usually the invoice. This guide breaks down every component of a 2026 Sentinel bill.

The security data pipeline platform has become the most strategically important layer in the modern SOC, and in the last twelve months, the largest security vendors have paid to own it. CrowdStrike acquired Onum for $290 million, SentinelOne acquired Observo AI for $225 million, and Palo Alto Networks acquired Chronosphere for $3.35 billion. The layer that sits between your data sources and your security tools now decides what every downstream tool receives, at what cost, and in what shape.

Every detection rule, every threat hunt, every AI agent you deploy rests on one silent assumption: that the data describing an attack actually reached your tools. When it doesn’t, nothing above it can save you, and no one gets an alert that the data was missing. Security teams invest heavily in the sharp end of the stack: detection content, threat intelligence, response playbooks, and increasingly, AI agents to triage and investigate at machine speed.