OpenAI released GPT-5.5 on April 23, 2026, one week after Anthropic launched Claude Opus 4.7 on April 16, putting the two most visible frontier AI labs into a direct comparison across benchmarks, coding tools, subscriptions, APIs, and enterprise workflows. Mashable framed the matchup as a split decision: GPT-5.5 wins more headline tests, while Claude Opus 4.7 still looks unusually strong where software agents have to plan, edit, test, and recover. That is the right surface read, but the more...