What it does
Offline runs use a stub, not Jev. These synthetic worlds have calculated reference answers; their errors do not establish reliability on real-world tasks.
Benchmarks & research
Jev Arena — probability checks
Compare Jev's answers about coins, dice and other synthetic worlds with probabilities that can be calculated exactly.
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How you can use it
Borrow the idea of asking questions whose answers can be calculated in advance. A developer can start with the local examples, which use pretend answers rather than Jev. Then compare live answers with the calculations. Errors about coins and dice do not tell you how reliable the model will be in business tasks.