head to head
Neither is simply harder - they are hard in different places. Antichamber demands more optimization; The Elder Scrolls V: Skyrim demands more execution.

Optimization · Pure Optimization
A non-Euclidean exploration puzzle testing your willingness to abandon assumptions about space.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Antichamber leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Antichamber
Navigation has no twitch demands
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Antichamber
No opponent; solo non-Euclidean exploration
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
The Elder Scrolls V: Skyrim leans clearly harder on variance.
Antichamber
World is deterministic once its rules are understood
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Antichamber leans clearly harder on optimization.
Antichamber
Deducing the non-Euclidean spatial logic and gun mechanics governing each room
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.