In addition to its increased fidelity over Taq polymerase, Vent polymerase has a half-life of approx 400 min at 95°C, making it a very hardy enzyme. The highest-fidelity polymerase for PCR applications is Pfu polymerase (from Pyrococcus furiosus), which displays an error rate of 1.5 × 10–6 errors/bp.