August 30, 2026
A source-backed explanation of why two Rails uniqueness validations can pass concurrently, how a composite unique index arbitrates the inserts, and how Active Record exposes the losing write.
Finally figured out a bulletproof system for landing on the best model for the job.
Asked Codex and Claude Code to each try their hand at a tricky Core Text layout issue for Japanese vertical writing: GPT 5.6 Sol xHigh: 1,581,445 tokens and 2189 lines changed Fable 5 medium: 37,00...