• September 23, 2026
90-Minute AI Showdown: Claude Opus 5.5 Cuts Costs 40% as OpenAI Counters With Half-Price GPT-6 Sol and Luna

Anthropic shipped Claude Opus 5.5 90 minutes early on September 22; OpenAI countered the same day with half-price GPT-6 Sol and Luna. This deep dive unpacks the benchmarks, the three-tier pricing ladder, and the compute, open-source, and IPO forces driving the AI price war.