Open-source SemIf replicates JEV's semantic ifs with Qwen 4B on a 3090 or MacBook
sven_ai · x · 2026-09-21
SemIf (formerly OpenJev, independent of JEV/TypeSafe) is a trending GitHub project (2.5k stars) offering an open-source alternative to JEV.
- Premise: most agent decisions are small — route this, retry that, does the evidence support X — so generating text with a chat model just to parse it back into an if statement is wasteful; SemIf performs "semantic ifs" with a frozen 4B open model
- Built on Qwen3.5-4B, no extra training needed, runs on a 3090 or even a MacBook locally at lower cost
- Ships a browser-based WebGPU demo (no waitlist) with reproducible measurements: same frozen model, same state, same 21 questions, aligned at t=0 in replay
- Includes a comparison leaderboard; accuracy is close to JEV but likely still somewhat behind
Related event: Open-Source SemIf Runs 4B Model on a Single RTX 3090 as Jev Alternative(3 posts)→
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