OSFP · Octal Small Form-factor Pluggable
Pluggable transceiver form factor with a larger thermal envelope than QSFP-DD, favored for the hottest high-rate AI links; the cage is soldered to the switch and fixed for its life.
Current numbers
144 × 800GQuantum-X800 radix (72 OSFP): two-tier fat-tree to 10,368 NICs; three tiers reach 746,496 on paper (k³/4)