Intel 15.40.7.4279 graphics drivers are OpenGL 4.4-certified
 

Intel has released updated drivers for its integrated graphics processors, which introduce support for Skylake-series CPUs with Intel HD Graphics 500 series IGPs. Perhaps most importantly, Intel has had this driver set certified for the OpenGL 4.4 API, for the IGPs in the Skylake and Broadwell families of CPUs. Download links are here for 64-bit and 32-bit Windows (7, 8.1, or 10.)

The drivers also fix a handful of issues, most notably display flicker after sleep with DisplayPort 1.2 displays, graphics corruption with ...

http://techreport.com/news/29018/int...-4-4-certified