Gemini 3.1 Pro
Gemini 3.1 Pro is a frontier reasoning model developed by Google, released in February 2026 as a major upgrade to the Gemini 3 series. It supports multimodal inputs — including text, images, video, audio, and code — within a single model, and offers a context window of 1,048,576 tokens, equivalent to roughly 1,500 A4 pages. The model scores 77.1% on the ARC-AGI-2 benchmark and introduces a medium thinking level designed to balance cost, speed, and reasoning depth.