Substitute James Quinn hit a dramatic late equaliser as Northampton set a new club record of 13 away unbeaten league games after drawing with Brighton.
Brighton looked to be heading towards a third successive win when Jake Robinson stabbed home on 39 minutes
Robinson led the attack for the first time with fellow teenager Joe Gatting after Brighton were hit by injury.
But Quinn, who replaced Joe Burnell in the 69th minute, punished poor Brighton defensive work to equalise late on.
Brighton: Henderson, Whing, Adam Hinshelwood, Butters, Mayo, Fraser, Hammond (Lynch 68), El-Abd, Cox (Rents 82), Gatting (Santos 85), Robinson.
Subs Not Used: Kuipers, Elphick.
Booked: El-Abd, Santos.
Goals: Robinson 39.
Northampton: Bunn, Crowe, Chambers, Doig, Bojic, Hunt (Watt 79), Burnell (Quinn 69), Jess, Cole (Holt 52), Kirk, McGleish.
Subs Not Used: Dyche, Dunn.
Goals: Quinn 84.
Ref: M Thorpe (Suffolk).