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Benchmarks & research

stuntdouble

A drop-in proxy that answers your app with Jev byte for byte while asking the same question of local doubles, then reports where they would have decided differently.

Source screenshot of stuntdouble
SOURCE SCREENSHOT · source ↗ · captured 2026-09-24Full screenshot ↗

What it does

On its jev-by-example cases two small models diverged on 6 of 28 application decisions, including one where a double would retry a write that may already have succeeded.

Maker-reported (not independently measured by JevMade): 6 of 28 application decisions diverged between two small models (jev-by-example suite) · reported suites: jevbench-hard, kev-decision-v2-300, jev-by-example

Primitives
choice, score, noul
Platform
JavaScript (Node)
Added
Project created

Source checked 2026-09-24 — opened the GitHub repository directly.