GPT-5.5 Released: Everything You Need to Know
On April 23, 2026, OpenAI introduced GPT-5.5, its most capable model to date and the first fully retrained base model since GPT-4.5. The release brings state-of-the-art scores on Terminal-Bench 2.0, OSWorld, and GDPval, a much stronger agentic coding profile in Codex, a new Pro tier, and a pricing step up that reflects the jump in intelligence. GPT-5.5 is rolling out to Plus, Pro, Business, and Enterprise users across ChatGPT and Codex. GPT-5.5 Pro is available to Pro, Business, and Enterprise tiers. For anyone using Fello AI on Mac, iPhone, or iPad, GPT-5.5 will be available in upcoming weeks alongside Claude 4.6, Gemini 3, DeepSeek, Kimi-K2.6, and Perplexity in the same […]
