The best replacement for o1 is 1095.

The best alternatives to o1 are rated as following:
★★★★★  1095
★★★★★  d2 steel
★★★★  a2
★★★★  h1b
★★★  a2 steel
★★  o1e
★★  3v
★★  sk5
★★  52100
★  eb1
★  5160
★  1095 steel
  440c
  w1

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o1
1095
d2 steel