YZ Index Major Overhaul: 7 New Models Including GPT-5.5, Claude Opus 4.7, and DeepSeek V4 Launch Simultaneously as 9 Veterans Retire
On May 1, 2026, YZ Index completed its largest evaluation roster update since launch last year, replacing 9 models and introducing 7 new flagships in a single sweep. This generational overhaul reflects the rapid pace of AI industry updates, where the evaluation system now needs to keep up with monthly rather than yearly iterations.