Google Gemini 3.1 Pro Enters Public Preview on Vertex AI with 1M-Token Context Window

Google Cloud Blog·high signal

Google released Gemini 3.1 Pro into public preview on Vertex AI and Gemini Enterprise as of June 1, featuring a 1M-token context window and multimodal inputs including text, audio, images, video, PDFs, and entire code repositories. A lighter companion, Gemini 3.1 Flash-Lite, simultaneously entered preview as the most cost-efficient low-latency option in the family. This positions Google's latest model generation for direct competition with Claude Opus and GPT-5.5 on the enterprise cloud AI platform battlefield.