OpenAI's official release of GPT-5.5 on April 23, 2026, drives overwhelming trader consensus toward the company as the model originator, with immediate availability in ChatGPT for Plus, Pro, Business, and Enterprise users, plus Codex integration. This large language model excels in agentic tasks like coding (82.7% on Terminal-Bench 2.0), knowledge work (84.9% GDPval), and multi-tool workflows, outperforming Anthropic's Claude Opus 4.7 and Google's Gemini 3.1 Pro on key benchmarks while matching GPT-5.4 speed and efficiency. Following rapid iterations like GPT-5.4 in March, it underscores OpenAI's iterative deployment strategy amid intensifying AI competition; traders eye GPT-5.5 Pro rollout and safety evaluations as near-term catalysts for further positioning.