Consulting tasks and the limits of assistance
Over 25% faster on tasks within GPT-4’s capability758 BCG consultants completing realistic knowledge-work tasks. The reported speed gain applies to the tasks within the tested model’s capabilities.
Working paper reported 21 September 2023 · journal publication March 2026
Performance depended on the task; assistance could worsen results beyond the model’s capabilities. This is historical, task-specific evidence, not a national productivity estimate or a claim about today’s models.
Read the study ↗ · 2026 publication ↗