GPT-5.5 Review: OpenAI’s Smartest Model Yet — Agentic Coding, Computer Use & More (April 2026)
GPT-5.5 landed April 23 — seven weeks after 5.4. OpenAI calls it a “new class of intelligence for real work.” It’s faster per token, stronger at agentic coding, computer use, and scientific research, and comes with the strongest safety guardrails yet. Here’s everything you need to know.