Jev is a System One Model that returns typed decisions with calibrated probabilities — no text, no parsing, $0.042/MTok input, output free, 70–500ms latency. Here's the routing layer every marketing pipeline was missing, plus the caveats the launch post didn't lead with.
DeepSeek shipped V4.1 Flash on Sep 10 with an unusual Causal Encoder-Decoder architecture and a $0.003/M off-peak cache-hit rate — about a tenth of what V4 Flash charged. The model has also absorbed V4 Pro's traffic from Sep 14. A working marketer's first-week take on what to hand it, what to keep on Opus 5 or the frontier tier, and where V4.1 Flash sits in the cache-heavy background stack.
