docs: update GenAI SDK README files to use gemini-flash-latest

Updates code snippets and documentation examples in the Python, Go, Java, JavaScript, and .NET GenAI SDK README files to reference gemini-flash-latest.

PiperOrigin-RevId: 970748778

Author: google-genai-bot

README.md

@@ -82,7 +82,7 @@ const ai = new GoogleGenAI({apiKey: GEMINI_API_KEY});
 
 async function main() {
   const response = await ai.models.generateContent({
-    model: 'gemini-2.5-flash',
+    model: 'gemini-flash-latest',
     contents: 'Why is the sky blue?',
   });
   console.log(response.text);
@@ -229,7 +229,7 @@ const ai = new GoogleGenAI({apiKey: GEMINI_API_KEY});
 
 async function main() {
   const response = await ai.models.generateContentStream({
-    model: 'gemini-2.5-flash',
+    model: 'gemini-flash-latest',
     contents: 'Write a 100-word poem.',
   });
   for await (const chunk of response) {
@@ -274,7 +274,7 @@ async function main() {
 
   const ai = new GoogleGenAI({apiKey: GEMINI_API_KEY});
   const response = await ai.models.generateContent({
-    model: 'gemini-2.5-flash',
+    model: 'gemini-flash-latest',
     contents: 'Dim the lights so the room feels cozy and warm.',
     config: {
       toolConfig: {
@@ -325,7 +325,7 @@ await client.connect(serverParams);
 
 // Send request to the model with MCP tools
 const response = await ai.models.generateContent({
-  model: "gemini-2.5-flash",
+  model: "gemini-flash-latest",
   contents: `What is the weather in London in ${new Date().toLocaleDateString()}?`,
   config: {
     tools: [mcpToTool(client)],  // uses the session, will automatically call the tool using automatic function calling
@@ -400,7 +400,7 @@ for more details.
 
 ```typescript
 const interaction = await ai.interactions.create({
-    model: 'gemini-2.5-flash',
+    model: 'gemini-flash-latest',
     input: 'Hello, how are you?',
 });
 console.debug(interaction);
@@ -415,14 +415,14 @@ conversation by referencing the `previous_interaction_id`.
 ```typescript
 // 1. First turn
 const interaction1 = await ai.interactions.create({
-    model: 'gemini-2.5-flash',
+    model: 'gemini-flash-latest',
     input: 'Hi, my name is Amir.',
 });
 console.debug(interaction1);
 
 // 2. Second turn (passing previous_interaction_id)
 const interaction2 = await ai.interactions.create({
-  model: 'gemini-2.5-flash',
+  model: 'gemini-flash-latest',
   input: 'What is my name?',
   previous_interaction_id: interaction1.id,
 });
@@ -479,7 +479,7 @@ import base64
 // const base64Image = ...;
 
 const interaction = await ai.interactions.create({
-  model: 'gemini-2.5-flash',
+  model: 'gemini-flash-latest',
   input: [
     { type: 'text', text: 'Describe the image.' },
     { type: 'image', data: base64Image, mime_type: 'image/png' },
@@ -505,7 +505,7 @@ const getWeather = (location: string) => {
 
 // 2. Send the request with tools
 let interaction = await ai.interactions.create({
-  model: 'gemini-2.5-flash',
+  model: 'gemini-flash-latest',
   input: 'What is the weather in Mountain View, CA?',
   tools: [
     {
@@ -538,7 +538,7 @@ for (const output of interaction.outputs!) {
 
     // Send result back to the model
     interaction = await ai.interactions.create({
-      model: 'gemini-2.5-flash',
+      model: 'gemini-flash-latest',
       previous_interaction_id: interaction.id,
       input: [
         {
@@ -564,7 +564,7 @@ Execution**.
 
 ```typescript
 const interaction = await ai.interactions.create({
-  model: 'gemini-2.5-flash',
+  model: 'gemini-flash-latest',
   input: 'Who won the last Super Bowl',
   tools: [{ type: 'google_search' }],
 });
@@ -577,7 +577,7 @@ console.debug(interaction);
 
 ```typescript
 const interaction = await ai.interactions.create({
-  model: 'gemini-2.5-flash',
+  model: 'gemini-flash-latest',
   input: 'Calculate the 50th Fibonacci number.',
   tools: [{ type: 'code_execution' }],
 });