Anthropic and OpenAI Unveil Cheaper Claude Opus 5.5 and GPT-6 Models, Sparking AI Price War

SentiSense · Published Sep 22, 2026, 12:16 PM ET · Updated Sep 23, 2026, 8:08 AM ET

Anthropic and OpenAI released cheaper frontier models within 90 minutes of each other. Claude Opus 5.5 is priced at $4 per million input tokens and $2...