Update s00.md

Author: ivan-magda

docs/s00.md

@@ -150,7 +150,7 @@ Our agent will need an Anthropic API key to function. Let's set up the conventio
 ```bash
 # .env.example
 ANTHROPIC_API_KEY=your-api-key-here
-MODEL_ID=claude-haiku-4-5
+MODEL_ID=claude-sonnet-4-6
 ```
 
 We'll read the API key from the process environment using `ProcessInfo.processInfo.environment["ANTHROPIC_API_KEY"]` when we build the API client in the next guide.