Gemini 3.1 Pro vs. Gemini 3 Pro: What Changed and What Developers Should Use Now
Google's Gemini lineup now includes both Gemini 3 Pro and Gemini 3.1 Pro, and while the version bump might look incremental, there are meaningful differences that developers need to understand before choosing one for a production build. The headline addition in 3.1 Pro is Google Maps grounding — the ability to anchor AI responses with live, location-aware data — which opens up a class of agentic applications that simply weren't possible before. Alongside that, Google has introduced a dedicated gemini-3.1-pro-preview-customtools endpoint specifically optimized for tool-heavy agent workflows, giving developers a cleaner surface for complex multi-tool orchestration.
In terms of multimodal rate limits, both models share the same ceiling, so the decision isn't about raw throughput. The more practical question is where active investment is going: Gemini 3.1 Pro is the branch receiving new capabilities, meaning developers starting fresh projects should default to it. For teams already running on Gemini 3 Pro, the migration calculus depends on whether your use case involves location-grounded responses or sophisticated agent pipelines — if it does, the upgrade is worth the integration work now. The LaoZhang AI Blog breaks down a concrete decision tree to help developers navigate exactly that choice.