Agent teams cost more, but usually do not improve app scores
For full-stack web app builds, multi-agent teams cost 1.8 to 5.1 times more than single agents, yet only one of four model-and-effort comparisons improved scores significantly. The benchmark had GPT 6 Sol and Claude Opus 5.5 build and deploy 50 apps, with browser agents grading their workflows. Sol’s medium-effort teams gained 7.3 points, while the other score changes were not statistically significant.