Gains from Custom Agent Harness Tuning Fade as Models Align with Official Frameworks

Tuning custom agent harnesses yields far smaller gains in 2026 than a year ago, as frontier models are now deeply co-trained with their labs' official harnesses, leaving third-party frameworks struggling to keep up.

2026-10-06 ~ 2026-10-06 · 3 related posts

• Custom agent harnesses are losing their edge as models train on official ones — pvncher · 2026-10-06
• Why Custom Agent Harnesses Struggle to Beat Frontier Lab Frameworks — pvncher · 2026-10-06
• Frontier models are trained for official harnesses, leaving little room for custom agent tuning — menhguin · 2026-10-06