When requesting an OpenGL context of a specific version, the created context does not always match that version but instead returns a context with "appropriate" capabilities. The mapping of requested and created version depends on various aspects, e.g., forward compatibility and core flags, context creation library, driver, graphics card, and operating system. To get some understanding of that mapping this Context Creation Cheat Sheet helps to gather the output of glbindings contexts example.

The data can be created by running glcontexts tool with --markdown:

glcontexts --markdown

For more information on the glcontexts tool please refer to the tools overview.