Cloudflare open-sources the Clef models, aiming straight at Jev
Cloudflare picked October 1 to wade into the fastest-moving model category of the fall: bounded, machine-consumable decisions rather than prose — and it brought open weights and a price list.
Cloudflare released Clef and Clef-flash, a pair of open-weight "decision models" built to beat TypeSafe's Jev at its own game. The category is Jev's invention — take in unstructured state, return typed, probabilistic decisions that software can act on, with no free-text sampling to hallucinate. Cloudflare's pitch is a drop-in: both models are Jev-API compatible, live on Workers AI, and ship under Apache 2.0, with Clef built on Qwen3.8-27B and Clef-flash on Qwen3.5-9B. On latency, Cloudflare claims a 209-millisecond median for Clef and 38.8 milliseconds for the flash variant, against 524 milliseconds for Jev — numbers that matter enormously for the workflow automation this category targets. Cloudflare also opened a fine-tuning service so buyers can adapt the models to their own decision taxonomies. Two more spec edges are worth noting: 64k context windows where Jev caps at 32k, and a vision encoder that lets Clef classify images and video in the same decision flow — something Jev, text-only, cannot do. Running either model yourself is not cheap, though: 41 GB of VRAM for Clef-flash, 85 GB for Clef.
The honest caveat: every score is Cloudflare's own, and none of it has been reproduced for the official Decision Index rankings. The split is instructive anyway — Clef wins the intent-classification tests handily (94.20 vs 79.74 on BANK77), while Jev still crushes it on knowledge-heavy reasoning (GPQA Diamond, 78.3 vs 48.0). Pricing cuts the other way: Clef charges $0.24 per million input tokens, nearly six times Jev's $0.042. And "open source" has an asterisk — the weights are public, but Cloudflare confirmed the training datasets are not. Our take: the interesting move isn't the benchmark tennis, it's that a major infrastructure vendor is treating decision models as a product line worth funding — the second open challenger to arrive since Jev's launch, after we covered Kev's open Jev alternative now trains on Qwen3.5 for about $95. A category gets real when the clones arrive; the ones who will feel it first are the vendors who priced on scarcity.
What to watch: whether the official Decision Index reproduces Cloudflare's numbers, and whether Jev responds on price.
Does open weight-plus-API-compatibility beat a head start in a category this young? Tell us in the comments.
