Zenith: frontier performance without Fable

Zenith 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.

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ii.inc·Updated Jul 7, 2026

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Zenith: frontier performance without Fable offers a free tier with optional paid upgrades.

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