fix(py/samples): update samples to use latest gemini models

[yesudeep]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @yesudeep, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on modernizing the Google GenAI plugin by integrating the newest generation of Gemini and Gemma models. It ensures that the framework is up-to-date with the latest AI capabilities and that all provided examples reflect these advancements, offering users access to improved performance and features.

Highlights

• New Model Support: Added comprehensive support for the latest Gemini 3 (Flash and Pro previews), Gemini 2.5 (Pro, Flash, Lite, TTS, and Image variants), and Gemma 3 models within the Google GenAI plugin. This includes new configuration schemas for TTS and Image functionalities.
• Sample Code Updates: All Python sample applications have been updated to utilize the newly supported, more advanced Gemini models, primarily migrating to gemini-3-flash-preview and gemini-3-pro-preview from older versions.
• Improved Model Definitions: Introduced generic ModelInfo constants (GENERIC_GEMINI_MODEL, GENERIC_TTS_MODEL, GENERIC_IMAGE_MODEL, GENERIC_GEMMA_MODEL) to better categorize and define the capabilities of various model types.

🧠 New Feature in Public Preview: You can now enable Memory to help Gemini Code Assist learn from your team's feedback. This makes future code reviews more consistent and personalized to your project's style. Click here to enable Memory in your admin console.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request updates the Gemini model versions used across various Python samples and adds definitions for new models. The changes are largely correct and consistent with the goal of using the latest models. I've provided a couple of suggestions for gemini.py to improve the accuracy of model metadata and enhance maintainability by reducing code duplication.