Update README to mention Claude 4 Sonnet & Opus (#519)

README.md

@@ -17,7 +17,7 @@
 - 🌐 Automate the browser
 - 🤖 Latest AI models
 - 🎁 API keys optional
-- 💡 **$20 free credits for Gemini 2.5 Pro, Claude 3.7 Sonnet, and GPT-4.1**<br/>Share feedback and earn more credits!
+- 💡 **$20 free credits for Gemini 2.5 Pro, Claude 4 Sonnet & Opus, and GPT-4.1**<br/>Share feedback and earn more credits!
 
 <p align="center">
   <img src="https://raw.githubusercontent.com/Kilo-Org/kilocode/refs/heads/main/kilo.gif" width="100%" />
@@ -37,7 +37,7 @@
 ## How to get started with Kilo Code
 
 1.  Install the Kilo Code extension from the [VS Code Marketplace](https://marketplace.visualstudio.com/items?itemName=kilocode.Kilo-Code).
-2.  Log in with your Google Account to get $20 in free Claude 3.7 Sonnet credits.
+2.  Log in with your Google Account to get $20 in free Claude 4 Sonnet & Opus credits.
 3.  Start using the extension. Here's a video to help you get started (just click on the image below and you'll be redirected to YouTube):
 
 [![Watch the video](https://img.youtube.com/vi/pqGfYXgrhig/maxresdefault.jpg)](https://youtu.be/pqGfYXgrhig)
@@ -46,7 +46,7 @@
 
 We're doing our best to combine the best of both worlds. Kilo Code combines all features of Cline, Roo, and adds a few of our own additions. It has the best features of both, and we're working on making it even better!
 
-No need to fiddle with API keys, Kilo Code ships with the latest AI models plugged in, including Claude 3.7 Sonnet and Gemini 2.5 Pro.
+No need to fiddle with API keys, Kilo Code ships with the latest AI models plugged in, including Claude 4 Sonnet and Opus and Gemini 2.5 Pro.
 
 Kilo Code is a direct fork from Roo Code, but also includes the following features from Cline (and more):