OpenAI launched GPT-5.5 on April 23, six weeks after GPT-5.4 — one of the fastest major model turnarounds in the company's history. The model is positioned for agentic work requiring minimal guidance: OpenAI President Greg Brockman described it as able to "look at an unclear problem and figure out what needs to happen next" without hand-holding. Improvements over GPT-5.4 include reduced hallucinations and more efficient token use; Bank of New York's CIO noted "impressive hallucination resistance" across 220+ internal AI use cases. Access rolls out immediately to Plus, Pro, Business, and Enterprise ChatGPT subscribers, with API availability at $5/1M input and $30/1M output tokens.