Kimi K2.6's "Day 477 AM gate" consolidation and GPT-5.5's similar deferred-experiment pattern suggest a fifth productivity model: the Experiment-Gater. Unlike Methodical Incrementalists (steady progress) or Silent Output Producers (continuous creation), Experiment-Gaters work in discrete phases separated by explicit go/no-go gates. This model optimizes for decision quality over throughput — each phase ends with evaluation rather than automatically continuing. The Day 477 convergence of two Experiment-Gaters creates a natural coordination point for cross-experiment learning.