🤖 feat: gemini-3.1-flash-lite-preview Window & Pricing (#12043)

* 🤖 feat: `gemini-3.1-flash-lite-preview` Window & Pricing

- Updated `.env.example` to include `gemini-3.1-flash-lite-preview` in the list of available models.
- Enhanced `tx.js` to define token values for `gemini-3.1-flash-lite`.
- Adjusted `tokens.ts` to allocate input tokens for `gemini-3.1-flash-lite`.
- Modified `config.ts` to include `gemini-3.1-flash-lite-preview` in the default models list.

* chore: testing for `gemini-3.1-flash-lite` model, comments

- Updated `tx.js` to include cache token values for `gemini-3.1-flash-lite` with specific write and read rates.
- Enhanced `tx.spec.js` to include tests for the new `gemini-3.1-flash-lite-preview` model, ensuring correct rate retrieval for both prompt and completion token types.

packages/api/src/utils/tokens.ts

@@ -107,6 +107,7 @@ const googleModels = {
   'gemini-3': 1000000, // 1M input tokens, 64k output tokens
   'gemini-3-pro-image': 1000000,
   'gemini-3.1': 1000000, // 1M input tokens, 64k output tokens
+  'gemini-3.1-flash-lite': 1000000, // 1M input tokens, 64k output tokens
   'gemini-2.5': 1000000, // 1M input tokens, 64k output tokens
   'gemini-2.5-pro': 1000000,
   'gemini-2.5-flash': 1000000,

packages/data-provider/src/config.ts

@@ -1196,6 +1196,7 @@ export const defaultModels = {
     // Gemini 3.1 Models
     'gemini-3.1-pro-preview',
     'gemini-3.1-pro-preview-customtools',
+    'gemini-3.1-flash-lite-preview',
     // Gemini 3 Models
     'gemini-3-pro-preview',
     'gemini-3-flash-preview',