OpenAI launches agentic GPT-5.5 with 82.7% on Terminal-Bench 2.0
openai launched gpt-5.5 on april 23, calling it its most capable agentic ai model yet. built from the ground up for autonomous planning and tool use, it scores 82.7% on terminal-bench 2.0 and 58.6% on swe-bench pro. pricing starts at $5 per million input tokens.
OpenAI released GPT-5.5 on April 23, marking its first retrained base model since GPT-4.5. Designed specifically for agentic workflows, the model co-developed with NVIDIA hardware scores 82.7% on Terminal-Bench 2.0 and 74.0% on the MRCR v2 retrieval benchmark at one million tokens. Independent validation from Artificial Analysis confirms the model offers token efficiency that offsets its doubled API price of $5 per million input tokens. GPT-5.5 is available immediately to Plus, Pro, Business, and Enterprise users.