What Changes in Gemini 3.1 vs 2.5? Know the Differences Clearly

Google’s Gemini naming looks like small decimals, but the jump from 2.5 to 3.1 is more like “new generation” than “minor patch.” Gemini 2.5 was framed as a thinking model built for harder reasoning and coding. Gemini 3.1 is the next iteration on the Gemini 3 family, tuned for tougher, longer, and more tool-heavy work, and it’s being rolled out across the Gemini app and developer stacks.

Where Gemini 3.1 Stands Apart From Gemini 2.5

Gemini 2.5 (2025) focused on “thinking” behaviour: better multi-step reasoning, stronger code, and an experimental Deep Think mode to push complex math and coding. It’s the era where Google talked openly about reasoning upgrades and practical multimodal use.

Gemini 3.1 (2026) is positioned as Google’s most advanced model for complex tasks, with native multimodal inputs and a token context window up to 1M plus large outputs, so it can handle bigger repos, longer documents, and heavier workflows. On the API side, Google even added a separate endpoint to prioritise custom tools better, which matters if you’re building agent-like flows.

Where The “Trend” Is Right Now: Real Product Rollouts

This isn’t just lab talk. Gemini 3.1 Pro is rolling into user products like the Gemini app and NotebookLM see the official post.

At the same time, Google keeps shipping “creative” features into Gemini experiences, like AI music creation tools arriving inside the Gemini app, which makes the model upgrades feel immediate, not abstract.

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