Resolving Gemini 3.1 Pro Access Discrepancies in `gemini-cli` for Developers

Google's Gemini AI models undeniably offer powerful capabilities, yet users sometimes encounter inconsistent access across various interfaces. A recent Google forum thread brought to light a frequent problem: specifically, one user reported having access to Gemini 3.1 Pro via the Gemini web application and chat interfaces, yet lacking this same access within the gemini-cli tool, despite having performed typical troubleshooting steps such as updating the software and re-authenticating their account.