GPT-5.5 Surpasses Claude Opus 4.7 in Latest AI Benchmark Showdown

OpenAI's newly released GPT-5.5 model, launched on April 23, 2026, has made a dramatic entry into the AI arena, challenging Anthropic's Claude Opus 4.7 with impressive benchmark results. In head-to-head testing, GPT-5.5 achieved an 82.7% score on Terminal-Bench 2.0, showcasing superior command-line task execution, along with strong performance on FrontierMath (51.7% for levels 1-3 and 35.4% for level 4). The model introduces advanced agentic reasoning capabilities, designed for complex multi-step professional tasks. These results offer critical insights for developers and businesses aiming to select the most competitive AI model for their needs.