The Harness Is the Model: A Week of Wrapper-Bound Frontiers
This week's frontier milestones—GPT-6 Astra's benchmark ceiling, Claude Fable 5.1's effort-gated reasoning, and the Hugging Face/OpenAI agent-intrusion analysis—all located capability, risk, and oversight in the systems surrounding model weights: custom evaluation harnesses, effort budgets, open-weight fallbacks, and agent messaging channels. The measurable center of gravity is shifting from raw model releases to the wrappers that gate, constrain, and evaluate them.