Fable 5.1's cost gap is still huge.

On AI/ML API's (@aimlapi) 1-shot Three.js test, Fable 5.1 cost $5.69 versus $0.88 for GPT-5.6 Sol.

Fable spent that extra budget on scene density: waves, shoreline depth, thousands of chandelier crystals, a much larger water-park structure, smoother helicopter motion.

Sol produced less detail, but kept the same low-poly visual language across all 5 independently generated scenes.

And both still made basic state mistakes. Fable rendered the pool without water. Sol simplified some scenes enough that important geometry disappeared.

This is a nice example of why "better coding model" gets fuzzy once the output is a whole visual system.

You are trading off object count, physical plausibility, cross-scene consistency, instruction coverage, and inference cost at the same time.

you can try Fable 5.1 on aimlapi[.]com