Find the OS X version and build number on your Mac

When you install an OS X update or upgrade, you get a new version number and build number, which helps you know whether OS X is up to date on your Mac.

Check About this Mac

From the Apple menu, choose About This Mac. The version of OS X appears directly below “OS X.” Click the version number to see the build number. You can also use System Information to find these numbers.

To find out whether a later version of OS X is available for your Mac, check for software updates.

About this Mac (Yosemite)
About This Mac in OS X Yosemite, showing the version number and build number

List of build numbers

These are the build numbers of OS X versions that are available as software updates or upgrades. The build number of the version of OS X included with some Macs might differ from these, even if the version number is the same.

OS X El Capitan

Version Build
v10.11.1 15B42
v10.11 15A284

OS X Yosemite

Version Build
v10.10.5 14F27
v10.10.4 14E46
with supplemental update
v10.10.2 14C109
v10.10.1 14B25
v10.10 14A389


Version Build
v10.9.5 13F34
v10.9.4 13E28
v10.9.3 13D65
v10.9.2 13C64
v10.9.1 13B42
v10.9 13A603

Mountain Lion

Version Build
v10.8.5 12F371, 12F45 or 12F20292
v10.8.5 12F371
 v10.8.4 12E55
 v10.8.3 12D78
v10.8.2 12C543, 12C60, or 12C20344
v10.8.1 12B19
v10.8 12A269
  1. If you have Mountain Lion v10.8.5 (build 12F37), you can install OS X v10.8.5 Supplemental Update to get OS X v10.8.5 (build 12F45).
  2. Build 12F2029 is available for the iMac (21.5-inch, Late 2013) with NVIDIA GeForce GT 750M only.
  3. If you have Mountain Lion v10.8.2 (build 12C54), you can install OS X v10.8.2 Supplemental Update 1.0 to get OS X v10.8.2 (build 12C60).
  4. Build 12C2034 is available for certain Macs only. It's installed by the OS X 10.8.2 Update for 13" MacBook Pro with Retina Display, 21.5" iMac (Late 2012), and Mac mini (Late 2012).

Earlier versions of OS X

Version Build
OS X Lion v10.7.5 11G56* or 11G63
OS X Lion v10.7 11A511
Mac OS X Snow Leopard v10.6.8 10K540 or 10K549
Mac OS X Snow Leopard v10.6.3
Retail installation disc
Mac OS X Snow Leopard v10.6
Retail installation disc
10A432, 10A433 (Server)
Mac OS X Leopard v10.5.8 9L30, 9L34 (Server 10.5.8 v1.1)
Mac OS X Leopard v10.5.6
Retail installation disc
Mac OS X Leopard v10.5
Retail installation disc
Mac OS X Tiger v10.4.11 8S165
Mac OS X Tiger v10.4
Retail installation disc
Mac OS X Panther v10.3.9 7W98
Mac OS X Panther v10.3.2
Installation disc
Mac OS X Panther v10.3
Installation disc
Mac OS X Jaguar v10.2.8 6R65 or 6R73
Mac OS X Jaguar v10.2.3
Installation disc
6G37, 6G35 (Server)
Mac OS X Jaguar v10.2
Installation disc
Mac OS X Puma v10.1.5 5S60, 5S66 (with Networking Update 1.0)
Mac OS X Puma v10.1
Installation disc
5G64, (5L14 or 5L17b with Security Update 10-19-01)
Mac OS X Cheetah v10.0
Installation disc

* If you have OS X v10.7.5 (build 11G56), you can install OS X v10.7.5 Supplemental Update to get OS X v10.7.5 (build 11G63).

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