ResearchNovember 12, 2026
22
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Bigger LLMs Don't Win Here
A new benchmark called LiveGeo evaluates geographic agents in continuously evolving worlds, alongside Ballad, which routes LLMs via a bandit algorithm to cut API costs.
#LLM-routing#bandit#optimization#cost-reduction
š„ What happened
Researchers at IIT Delhi found that pricier frontier LLMs give no consistent edge over cheap open-weight models in automated heuristic discovery. Their system Ballad routes across a model pool via a bandit algorithm and beats every solo model in several cases.
š” Why it matters
Up to 65.6% lower API cost at equal or better quality across five NP-hard optimization problems. That flips the assumption that more model power always means better results.
ā” Our take
Anyone still defaulting to the most expensive model is burning budget on a placebo. Routing is the real engineering discipline ā not model selection.
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