Zenith: frontier performance without Fable vs One Shot Challenge

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

FeatureZenith: frontier performance without FableOne Shot Challenge
CategoryProductivityProductivity
PricingFreemiumFree
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.One prompt, one AI model, one shot. Write a single prompt, run it once with any model, and the result is your entry. Six winners take a GTA VI copy (first place a PS5 too), one of them chosen by community vote. Winners showcased at the SIGGRAPH Hack Awards in LA.
Tags
WithoutPerformanceFrontierZenith
Vibe CodingOne Shot ChallengeAi HackathonOne Prompt Challenge
Websiteii.inc1shotchallenge.ai
User RatingNo reviews yetNo reviews yet
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AddedJun 30, 2026Jul 14, 2026
Zenith: frontier performance without Fable
Zenith: frontier performance without Fable
One Shot Challenge
One Shot Challenge

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