Python vs Oliver Grayson (TV Series): who would win?

Python favored — Slight edge (~55%)

Python · Percy Jackson · Base

Tier

HIGH 6-A, up to HIGH 4-C

Attack Potency

Multi-Continent Level, up to Large Star Level

Speed

Massively Hypersonic+, up to Speed Of Light

Durability

Multi-Continent Level, up to Large Star Level

Oliver Grayson (TV Series) · Invincible · Season 3

Tier

HIGH 6-A

Attack Potency

Multi-Continent Level

Speed

Supersonic+

Durability

Multi-Continent Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.