Mystery model Jev spawns 6 open-source clones in 2 days, each with a different architecture
IgorCarron · x · 2026-09-21
- The unreleased model "Jev" has triggered a reproduction race: 6 community clones shipped in 2 days, all built on speculation since the original is closed, each with a different architecture.
- Highlights: Laya (ModernBERT-style 421M encoder + PPO), DiffusionGemmaJev (diffusion-based, benchmarks close to the original), Bespoke Nimble (Qwen3.5-9B LoRA, 90% on a custom eval vs 93% for the original), SemIf (Qwen3.5 + 3-class NLI classifier, 4B and 35B), Jevlike (40KB-embedding lightweight attention), Kev-0.5B (0.5B LoRA that runs on a MacBook Pro).
- Latent Space's read: the ModernBERT theory and the diffusion theory are the most plausible.
Related event: Mystery closed-source model Jev sparks cloning frenzy(2 posts)→
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