IBM's lifecycle page puts z/OS 2.5 end of support at September 30, 2026 (GA September 30, 2021; withdrawn from marketing January 29, 2024). z/OS follows the Enhanced policy — five years standard, up to three more paid — so the bridge exists at mainframe prices. The verified dates for 2.3 through 3.2, what the extension covers, the 3.1/3.2 upgrade path and coexistence rule, how to check your release, and the decision framework.
z/OS EOL Risk Scores
| Release | EOL Risk Score | What drives it |
|---|---|---|
| z/OS 2.5 | 25 | End of support September 30, 2026 — the recency factor is climbing; IBM extension available. |
| z/OS 3.1 | 10 | Supported, no announced end date; the platform baseline. |
What's covered
- Key Dates at a Glance
- z/OS EOL Risk Scores
- How the z/OS Lifecycle Works
- The Paid Extension: What It Buys
- The Move to 3.1 or 3.2
- How to Check Your z/OS Release
- Your Options, Honestly Compared
Full guide with every version, risk scores, and live updates: https://endoflife.ai/article-zos-25-eol
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