Claude Opus 4.6 (14-index) vs Claude 4.5 (Negative): How Much Better — a Data-First Comparison (Feb 2026)

https://edgarscoolcolumn.lowescouponn.com/why-high-summarization-scores-hid-a-bigger-problem-an-engineering-team-s-deployment-story

Benchmark snapshot: measured gains in accuracy, hallucination rate, and throughput (tests run 2026-02-15 to 2026-02-20) The data suggests Claude Opus 4.6 (the 14-index release) outperforms Claude 4