Update default embedding model to text-embedding-3-small

- Changed from text-ada-002 to text-embedding-3-small
- Aligns with OpenAI's current best practices
- More cost-effective and better performance

README.md

@@ -115,7 +115,7 @@ LLM backends can be specified as simply as `"model": "gpt-3.5-turbo"`. However,
 "embedding": {
   "api": "openai",
   "url": "https://api.openai.com/v1/",
-  "model": "text-embedding-ada-002"
+  "model": "text-embedding-3-small"
 }
 ```
 

src/models/gpt.js

@@ -55,7 +55,7 @@ export class GPT {
 
     async embed(text) {
         const embedding = await this.openai.embeddings.create({
-            model: this.model_name || "text-embedding-ada-002",
+            model: this.model_name || "text-embedding-3-small",
             input: text,
             encoding_format: "float",
         });