Can't choose between Kimi K3 and Fable 5? Just use both — 93% accuracy

AI reasoning platform Fireworks ran the same agent scaffolding on Kimi K3 and Fable 5 across five task categories: code fixing, long-running terminal operations, algorithms, multilingual programming, and legal tasks. The two models are nearly neck and neck, but each has distinct strengths. K3 excels at security, cryptography, and lengthy terminal tasks; Fable 5 shines in multilingual programming, web scraping, and data visualization.

Fireworks also conducted an "omniscient routing" experiment: running both models on every task and then selecting the correct, cheaper answer after the fact. The combined accuracy hit 93%, beating any single model. K3 handled 72% to 96% of tasks, while Fable 5 tackled the long-tail hard ones.

K3 was cheaper across all five task types. For long terminal tasks, it was up to 50 times less expensive than Fable 5. But that 93% figure is an oracle result, not an actual deployed routing achievement by Fireworks.

K3 will open source on July 27 and then go live on Fireworks.