https://everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-2.6-15-mid-2012-unibody-usb3-specs.html

Pre-Installed MacOS:X 10.7.3 (11D2097) Maximum MacOS:X 10.15.x*

*This system fully supports the last version of OS X 10.8 "Mountain Lion." OS X 10.9 "Mavericks", and OS X 10.10 "Yosemite" as well as OS X 10.11 "El Capitan" with the exception of the "Power Nap" feature. It is capable of running macOS Sierra (10.12) as well, although it does not support the Auto Unlock feature. This model is capable of running macOS High Sierra (10.13), and it supports HEVC (High-Efficiency Video Coding), but it does not support hardware accelerated HEVC.

This model is compatible with the final version of macOS Mojave (10.14) and the final version of macOS Catalina (10.15), as well. It does not support macOS Big Sur (macOS 11) or later versions of the macOS.