Claude Opus 5 Tops AA-Briefcase: Beats Fable 5 by 150 Elo, 20% Cheaper per Task

Claude Opus 5 leads the AA-Briefcase agentic knowledge work benchmark with an Elo of 1720, outperforming Claude Fable 5 by 146 points while costing 20% less per task. It excels in analytical quality but lags slightly in presentation quality behind GPT-5.6 Sol.

• benchmark
• Cost Efficiency
• AA-Briefcase
• Claude Opus 5