Do Agent Teams Pay Off? A Case Study on Vibe Code Bench

Published 12 October 2026

Tests of GPT-6 Sol and Claude Opus 5.5 found that agent teams cost 1.8 to 5.1 times more than single agents, with no statistically significant score improvement in most settings. The value of teaming depended on the model, task, and budget, while higher reasoning effort may offer a better alternative.