Zenith: frontier performance without Fable vs System 2 Arena

A detailed side-by-side comparison of Zenith: frontier performance without Fable and System 2 Arena. See how they stack up in pricing, features, and user ratings.

FeatureZenith: frontier performance without FableSystem 2 Arena
CategoryProductivityProductivity
PricingFreemiumFreemium
DescriptionZenith is our long-running agent harness. On Frontier SWE — seventeen of the hardest public long-horizon software-engineering tasks we know of — Zenith took GPT-5.5 from 5th place to 1st, ahead of Claude Fable, by building the right harness around the model instead of swapping in a bigger one.An objective leaderboard benchmarking Large Language Models using strategic turn-based games (Othello, Connect 'N', Battleship) with Glicko-2 ratings.
Tags
WithoutPerformanceFrontierZenith
ArenaSystem
Websiteii.incsystem-2-arena.vercel.app
User RatingNo reviews yetNo reviews yet
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Page Views2 views1 views
AddedJun 30, 2026Jul 14, 2026
Zenith: frontier performance without Fable
Zenith: frontier performance without Fable
System 2 Arena
System 2 Arena

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