feat: add env variable to limit LLM usage to gpt3.5

.env.template

@@ -1,2 +1,4 @@
 # Your openai api key. (required)
-OPENAI_API_KEY=sk-xxxx
+OPENAI_API_KEY=sk-xxxx
+# Allow all OpenAI models (not only gpt 3.5)
+ALLOW_ALL_MODELS=true

README.md

@@ -17,7 +17,7 @@
 
 Welcome to [LlamaIndex Chat](https://github.com/run-llama/chat-llamaindex). You can create and share LLM chatbots that know your data (PDF or text documents).
 
-Getting started with LlamaIndex Chat is a breeze. Visit https://chat-llamaindex.vercel.app - a hosted version of LlamaIndex Chat with no user authentication that provides an immediate start.
+Getting started with LlamaIndex Chat is a breeze. Visit https://chat.llamaindex.ai - a hosted version of LlamaIndex Chat with no user authentication that provides an immediate start.
 
 ## 🚀 Features
 
@@ -76,24 +76,28 @@ cp .env.template .env.development.local
 Edit environment variables in `.env.development.local`.
 
 #### Building the Docker Image
+
 ```bash
 docker build -t chat-llamaindex .
 ```
 
 #### Running in a Docker Container
+
 ```bash
 docker run -p 3000:3000 --env-file .env.development.local chat-llamaindex
 ```
 
 #### Docker Compose
+
 For those preferring Docker Compose, we've included a docker-compose.yml file. To run using Docker Compose:
 
 ```bash
 docker compose up
 ```
+
 Go to https://localhost:3000 in your web browser.
 
-__Note__: By default, the Docker Compose setup maps the `cache` and `datasources` directories from your host machine to the Docker container, ensuring data persistence and accessibility between container restarts.
+**Note**: By default, the Docker Compose setup maps the `cache` and `datasources` directories from your host machine to the Docker container, ensuring data persistence and accessibility between container restarts.
 
 ### Vercel Deployment
 

app/api/llm/route.ts

@@ -151,6 +151,17 @@ export async function POST(request: NextRequest) {
  );
  }
 
+ const allowAllModels = JSON.parse(process.env.ALLOW_ALL_MODELS || "false");
+ if (!allowAllModels && config.model !== "gpt-3.5-turbo") {
+ return NextResponse.json(
+ {
+ error:
+ "Only configured to use GPT 3.5. Change model used by the bot or set 'ALLOW_ALL_MODELS' env variable to 'true'.",
+ },
+ { status: 400 },
+ );
+ }
+
  const llm = new OpenAI({
  model: config.model,
  temperature: config.temperature,