correct model version nomenclature in Counting_Tokens.js

[ChefitoGG]

Hi Gemini API Team!

I noticed that Counting_Tokens.js references model versions like gemini-2.5-flash and gemini-3-pro-preview. However, according to the official Gemini Models documentation, the current available versions are in the 1.5 family.

Using 2.5 in the example code causes a "Model not found" error for users trying to run the notebook.

Changes:

Updated MODEL_ID to gemini-1.5-flash.

Updated comments to reflect current stable model naming conventions.

This ensures the cookbook remains functional and accurate for the developer community.

[gemini-code-assist]

Summary of Changes

Hello @ChefitoGG, 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This pull request addresses an issue in the Counting_Tokens.js example by updating outdated Gemini model references. The change ensures that the example code is functional and accurate, preventing errors for developers trying to use the provided snippets and keeping the cookbook up-to-date with the latest API specifications.

Highlights

• Model Version Update: The MODEL_ID in Counting_Tokens.js has been updated from gemini-2.5-flash to gemini-1.5-flash to align with current official Gemini Models documentation.
• Documentation Accuracy: Inline comments listing available model versions have been revised to reflect the gemini-1.5 family nomenclature, preventing "Model not found" errors for users.

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[gemini-code-assist]

Code Review

Great catch on updating the model versions to gemini-1.5-flash! This is an important fix to ensure the cookbook examples run correctly for users. I've added a couple of suggestions to further improve the code's clarity and maintainability by fixing a small typo in the model list and adding a newline at the end of the file.

[franciscoarturorivera371-cyber]

Submit the approval with the change..

[ChefitoGG]

I have manually applied the suggested changes from Gemini Code Assist. The code is updated and all conversations are resolved. Ready for your final review, @franciscoarturorivera371-cyber !