GPT-5.5 and GPT-5.5 Pro arrive on Vercel AI Gateway

Vercel AI Gateway has added support for GPT-5.5 and GPT-5.5 Pro, both designed for long-running agentic work spanning coding, computer use, knowledge work, and scientific research, with improved token efficiency over the previous generation. GPT-5.5 focuses on agentic coding and long-horizon tasks that require holding context across large codebases and propagating changes throughout. GPT-5.5 Pro targets demanding, multi-step workflows where response quality takes priority over latency, with early testing showing gains in business, legal, education, data science, and technical research. Both models are accessible via the AI SDK using the model identifiers `openai/gpt-5.5` and `openai/gpt-5.5-pro`.