Update json-endpoint.mdx

Author: kathayl

src/content/docs/browser-rendering/rest-api/json-endpoint.mdx

@@ -254,7 +254,7 @@ Browser Rendering can use a custom model for which you supply credentials. List
 - `model` should be formed as `<provider>/<model_name>` and the provider must be one of these [supported providers](/ai-gateway/chat-completion/#supported-providers).
 - `authorization` is the bearer token or API key that allows Browser Rendering to call the provider on your behalf.
 
-This example uses the `custom_ai` parameter to instruct Browser Rendering to use a custom Anthropic model. The prompt asks the model to extract the main `<h1>` and `<h2>` headings from the target URL and return them in a structured JSON object.
+This example uses the `custom_ai` parameter to instruct Browser Rendering to use a Anthropic's Claude Sonnet 4 model. The prompt asks the model to extract the main `<h1>` and `<h2>` headings from the target URL and return them in a structured JSON object.
 
 ```bash
 curl --request POST \
@@ -302,9 +302,9 @@ curl --request POST \
 
 ### Using a custom model with fallbacks
 
-You may specify multiple models to provide automatic failover. Browser Rendering will attempt the models in order until one succeeds. To add failover, list additional models.
+You may specify multiple models to provide automatic failover. Browser Rendering will attempt the models in order until one succeeds. To add failover, list additional models in the `custom_ai` array.
 
-In this example, Browser Rendering first calls claude-sonnet-4-20250514. If that request returns an error, it automatically retries with gpt-4o.
+In this example, Browser Rendering first calls Anthropic's Claude Sonnet 4 model. If that request returns an error, it automatically retries with Meta Llama 3.3 70B from [Workers AI](/workers-ai/), then OpenAI's GPT-4o.
 
 ```
 "custom_ai": [
@@ -313,6 +313,10 @@ In this example, Browser Rendering first calls claude-sonnet-4-20250514. If that
     "authorization": "Bearer <ANTHROPIC_API_KEY>"
   },
   {
+    "model": "@cf/meta/llama-3.3-70b-instruct-fp8-fast",
+    "authorization": "Bearer <CLOUDFLARE_AUTH_TOKEN>"
+  },
+{
     "model": "openai/gpt-4o",
     "authorization": "Bearer <OPENAI_API_KEY>"
   }