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Google has released Gemini 3.1 Pro Preview on Vertex AI, positioning it as their most powerful agentic and coding model. It features a 1M token input context window, 64k output token limit, and supports audio, images, video, text, and PDF inputs. Key changes from Gemini 2.5 Pro include a new thinking level parameter (Low/Medium/High) replacing the legacy thinking_budget, stricter validation for function calling (removed thought signatures cause 400 errors), multimodal function response support, streaming function calling, and updated media resolution defaults for image, video, and PDF modalities.

Gemini 3.1 Pro Preview – Vertex AI – Google Cloud console

Key changes compared to Gemini 3 Pro Preview