Hi, the SimBrief profiles are based on:
Climb
Long Range: 250 kts transition to about Mach 0.62, then Mach 0.66 above 31,000 ft
High Speed: 250 kts below 10,000, then 280 kts transition to Mach 0.66
Cruise
LRC: 240 kts / Mach 0.68
MCR: 300 kts / Mach 0.72
Descent
Long Range: Mach 0.60 transition to 250 kts
High Speed: Mach 0.72 transition to 290 kts
Cruise speeds can be seen in most OFP navlogs, but climb/descent speeds often aren’t shown (in the real world pilots should just “know” these speeds, so most airlines will not list them in the OFP).
Best regards,