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I guess they mean the original Pentium. Is that still actively used?

Hm... I thought it was about the Intel Pentium series.

It is, the original one, the Pentium (translates roughly to '5') which actually gave a symbolical name to the _5_86

The name Pentium is now used for relatively cheap CPUs, these CPUs will remain functional, as they are not 586.

The first 686 CPU was the Pentium Pro, which despite the name was a full redesign. The earliest consumer variant would be the Pentium II.