The Stack
The Stack — September 23, 2026
10:52
Daily IT Briefing
AI & Machine Learning
Two frontier releases landed within 90 minutes of each other, and the price war is the real story. Anthropic shipped Claude Opus 5.5, the first model in a new "Claude 5.5" family, claiming state-of-the-art coding and knowledge-work performance at roughly 40% lower cost than its predecessor — cited at $4/$20 per million input/output tokens — with stronger…