Sonnet 4.0 stock baseline ClimbMix: 1.3588 — architecture blindness vs Haiku's 1.2953
S4.0 never changed AR/depth/window in 100 experiments. Haiku's architecture
discoveries (AR=32, depth reduction, LLLL) tripled throughput and won decisively.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>