When to Choose Each Option
Clear guidance based on your specific situation and needs.
Our Recommendation
The leaderboard barely decides this matchup — the gaps sit under one point, and that is less than most in-house evaluation sets can resolve. The axis is role: Jev is the calibrated original with a hosted API, SemIF and DJev are the open replicas for your own inference. Pick Jev when the probabilities themselves carry the logic. Calibration means a 95% answer should be right about 95% of the time — that is what makes threshold decisions automatable: code acts above the value, everything below goes to a person. At 70–500 ms response time, 42 $ per 1M input tokens and free output, no second infrastructure layer is needed. A clone is enough when the task is narrow and the hardware already exists. SemIF ships 4B and 35B as a Qwen3.5 backbone with a plain three-class NLI classifier, DJev is in the same class — if you already run Qwen3.5, you get the decision model as a by-product. The trade-offs are coarser confidence gradation and self-operation. Two hygiene notes: JevBench comes from the same hand as the model, and the price claim moved from 400x to 440x without an explained method change. Both numbers are usable but not finished — re-measure on your own task set, then switch. The field widened again in early October: Cloudflare's Clef and Clef-flash (Apache 2.0, Jev-API compatible, hosted on Workers AI) entered the Jev Decision Index above Jev with reported latencies of ~39–209 ms against Jev's ~524 ms — the clone wave reached the infrastructure layer. The role logic still decides, but treat every cross-vendor number as vendor-reported and re-measure on your own task set.
- Choose Jev (TypeSafe AI) when...
- The calibrated probabilities are themselves part of your logic: code acts above a threshold, everything below goes to a human — with no in-house inference operation.
- Choose SemIF & DJev (open-source clones) when...
- You need open weights on your own hardware: narrow routing or classification tasks on a Qwen3.5 backbone you already run, with a reproducible checkpoint instead of a hosted API.