☀️ AI BRIEF — Tue Sep 29, 2026 Anthropic dropped Claude Sonnet 5.5 yesterday — and the mid-tier just ate the flagship's lunch. Near-Opus brains at half the pri

☀️ AI BRIEF — Tue Sep 29, 2026 Anthropic dropped Claude Sonnet 5.5 yesterday — and the mid-tier just ate the flagship's lunch. Near-Opus brains at half the price. OpenAI's DevDay starts today. Thread 🧵 💰 THE PRICE $2/M input, $10/M output — same as Sonnet 5, HALF of Opus 5.5 ($4/$20). 30%+ faster…