Everyone Needs to Be a Leader: After a Week with GPT-5.5 and Opus 4.7

The density of model releases this April was a bit insane. Opus 4.7 dropped on April 16, the same day Codex CLI launched Goal Mode. On April 23, GPT-5.5 (codename "Spud") went live, followed on May 5 by GPT-5.5 Instant replacing ChatGPT's default mod...