Add Sonnet 4.6 Cosmopedia-v2 results — AR=21 breaks AR=32 consensus
Sonnet 4.6 completed 101 experiments on Cosmopedia-v2: 16 keeps (16.0%),
0 crashes, best val_bpb 0.9549 (vs Sonnet 4.0's 0.9606). The key discovery
is ASPECT_RATIO=21, breaking the universal AR=32 finding from all five
Sonnet 4.0 datasets. Every parameter differs between the two models' best
configurations.
New: Sonnet-4.6-Cosmopedia-v2-Agent-Run-Mar-24-2026.md
Updated: Cross-LLM-Comparison.md (3 datasets), Cross-Dataset-Comparison.md,
Home.md, cross-llm-comparison.png chart (3 datasets)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>