OpenAI’s GPT-5.5, launched as its most capable model yet, is aimed at complex, agentic tasks and professional workflows. However, in head-to-head testing across seven advanced challenges, Anthropic’s ...

Anthropic’s Claude Opus 4.7 decisively outperformed OpenAI’s newly launched GPT-5.5 in a seven-round head-to-head test of complex reasoning, technical accuracy, and problem-solving. Across challenges ...