OpenAI Releases GPT-5.5: Faster Thinking, Lower Cost, and a Step Toward the AI Super-App

OpenAI released GPT-5.5 on April 23, calling it its "smartest and most intuitive" model to date. The headline improvement isn't raw benchmark scores — it's efficiency. GPT-5.5 delivers better results for fewer tokens, which means every task you run costs less than before. For everyday users, this translates to longer, more coherent conversations without the model losing track. For businesses, it means the same monthly API budget now goes further. OpenAI president Greg Brockman described the model as "a faster, sharper thinker per token compared to 5.4," adding that it represents another step toward the company's goal of building a multi-purpose AI super-app — a single tool that handles work across writing, coding, research, math, and science. GPT-5.5 is designed to be broadly useful: it handles agentic coding workflows, long-form writing, mathematical reasoning, and scientific tasks within the same model. There's no need to switch between specialized tools. It also includes access to trusted-tier cybersecurity features, allowing verified security researchers and government partners to use the model for defensive infrastructure work without unnecessary blocks. OpenAI framed this as part of its "AI resilience" effort — making powerful tools available to defenders, not just attackers. Performance benchmarks show GPT-5.5 outperforms GPT-5.4 on coding, reasoning, and instruction-following across standard leaderboards. It is available now to ChatGPT subscribers and via the API. Pricing is reduced versus 5.4 on a per-token basis. The practical implication: if you've been holding off on building with the API because costs were hard to justify, GPT-5.5 changes that calculus. This is the most production-ready OpenAI model yet.