Thanos vs Cortex

Thanos

thanos.io

Analyzed September 21, 2026

Depends

Confidence: Medium

Buy if you run Prometheus across many clusters and need cheap, years-long metrics retention.

Read the full report

Cortex

cortexproject.io

Starting report…

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Pick Thanos when

Large Kubernetes fleets
Multi-cluster Prometheus setups
Teams needing years of metrics retention
Cost-sensitive long-term storage

When Thanos is not a fit

Single Prometheus instance . plain retention is enough
Small teams without dedicated SRE/Kubernetes staff
Anyone wanting a hosted, zero-ops monitoring SaaS
Non-Prometheus metrics stacks

Sources

Thanos official sitethanos.io
official
Thanos GitHub repositorygithub.com
official
Thanos design docthanos.io
official
Thanos getting startedthanos.io
official
Thanos at Medalliathanos.io
news
Thanos security policythanos.io
security
Thanos release processmaster--thanos-io.netlify.app
official
Thanos vs Grafana Agent comparisonlibhunt.com
review