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By torntrousers
#66855 There is a file named "version" within the ESP8266 core files in the Arduino IDE install which contains the SDK version. Eg here: portable\packages\esp8266\hardware\esp8266\2.3.0\tools\sdk\version

The 2.3.0 release has SDK version 1.5.3_16_04_18

The 2.4.0-rc1 release has SDk version 2.0.0_16_08_09

And there is a GIT branch "update_sdk_2.1.0" which has the latest 2.1.0 SDK, see here.