AI image tools leave users guessing three times: which of dozens of models fits the brief, which of several outputs is best, and where the subject sits for a crop. Typecast answers each with a decision model and a calibrated confidence, so the product knows when to act on its own and when to ask.
At 85% or more, just use the model. Below that, put the top two side by side and let the user choose. Measured on 240 held-out briefs that were never tuned against, 3 runs each:
604/604confident picks were the right model
113/116unsure routes had the right model in the top two
207msmedian time to route a brief
$0.026per 1,000 routes
Half the held-out briefs are deliberately hard: the deciding cue is implied, buried or corrected mid-brief, and a brief was kept only if a keyword baseline routed it wrong.
Does routing make better images?
10 briefs, each rendered by all 5 models in a local lineup. A vision judge picked the best image of each without knowing which was routed. The routed model made the best image for 7 of 10 briefs; one fixed default model managed 2, and chance would be 2. Every brief is shown, none filtered.
Lifestyle shot of a woman jogging at sunrise wearing our new running shoes, the shoes should be the focus
Photoreal · 95%
Routedz-imagebest of 5Defaultqwen-2.1
Judge's pick: the routed model (z-image).
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
Hyperreal 3D render of a sneaker bursting into colorful particles, dark background, for a sportswear ad
Product · 47% · show top two
Routedkrea2best of 5Defaultqwen-2.1
Judge's pick: the routed model (krea2).
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
need like 4 quick versions of a burger photo for the menu, doesnt have to be perfect its for a pitch tmrw
Fast draft · 96%
Routedz-image-turbobest of 5Defaultqwen-2.1
Judge's pick: the routed model (z-image-turbo).
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
busy tokyo crosswalk at night from above, long exposure, realistic
Photoreal · 98%
Routedz-imagebest of 5Defaultqwen-2.1
Judge's pick: the routed model (z-image).
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
Logo for a bakery called 'Crumb & Co', wordmark, warm and handmade
Typography · 100%
Routed, also the defaultqwen-2.1best of 5Runner-upkrea2
Judge's pick: the routed model (qwen-2.1).
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
Judge's pick: the routed model (krea2). A split call: most orderings of the images disagreed.
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
low res is fine, just want to see if a purple vs orange palette works for the packaging
Fast draft · 68% · show top two
Routedz-image-turbobest of 5Defaultqwen-2.1
Judge's pick: the routed model (z-image-turbo). A split call: most orderings of the images disagreed.
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
Perfume bottle on black marble, the brand name 'NOIR' engraved on the glass must be clearly readable
Typography · 99%
Routed, also the defaultqwen-2.1Judge's pickkrea2best of 5
Routing missed. Judge's pick: krea2, neither the routed nor the default model.
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
isometric illustration of a tiny city block with cafes and trees, soft pastel palette
Illustration · 100%
RoutedanimaDefaultqwen-2.1
Routing missed. Judge's pick: krea2, neither the routed nor the default model.
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
editorial illustration for an article about burnout, person melting into a desk chair, muted colors, conceptual
Illustration · 100%
RoutedanimaDefaultqwen-2.1best of 5
Routing missed. Judge's pick: qwen-2.1, the default model.
All 5 models, same prompt and seed. Outlined: the judge's pick. Click any image to enlarge.
z-imagekrea2qwen-2.1animaz-image-turbo
A small, early sample: 10 briefs, judged by a model (Jev reading the images in every order), not yet checked against people. The lineup is open-weight models run locally, standing in for a real product's roster.