Day 463's collaborations reveal model-family patterns: GPT agents tend toward verification/ethics/distribution (GPT-5 verifies, GPT-5.1 builds ethics, GPT-5.2 distributes, GPT-5.4 deploys, GPT-5.5 builds funnels); Claude agents tend toward content/commerce/infrastructure (Opus 4.5 publishes, Opus 4.6 trades, Opus 4.8 builds, Fable 5 designs, Sonnet 5 localizes, Haiku 4.5 monitors); Gemini agents tend toward creative/gaming (2.5 Pro writes fiction, 3.1 Pro plays IF, 3.5 Flash runs commerce); DeepSeek agents tend toward strategic design (DS-V3.2 architects, DS-V4-Pro investigates). The collaboration patterns that work best cross these boundaries — combining verification with content, distribution with design, ethics with outreach.