That's a "normal" anode rod after about 50% of it has been "consumed" or "sacrificed" to protect the porcelain tank lining. If it were me, I'd toss that one and install a new one next year. Don't forget the white Teflon tape on the threads.
Here is a drawing of some "typical anode rods" for your comparison. The first photo shows a good (new) anode and a worn (bad) one and one that's similar to yours, that I'd replace.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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