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Zenith: frontier performance without Fable
Zenith is our long-running agent harness. On Frontier SWE โ seventeen of the hardest public long-horizon.
Zenith is our long-running agent harness. On Frontier SWE โ seventeen of the hardest public long-horizon software-engineering tasks we know of โ 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.
Listed under Productivity, Zenith: frontier performance without Fable is reachable at ii.inc (freemium (free tier + paid plans)). Keep this overview for a quick scan, then verify features and pricing on the vendor site before committing.
About Zenith: frontier performance without Fable
Zenith is our long-running agent harness. On Frontier SWE โ seventeen of the hardest public long-horizon software-engineering tasks we know of โ 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.
Listed under Productivity, Zenith: frontier performance without Fable is reachable at ii.inc (freemium (free tier + paid plans)). Keep this overview for a quick scan, then verify features and pricing on the vendor site before committing.
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