diff --git a/server/.env.example b/server/.env.example
index e606aa9..4a3a55f 100644
--- a/server/.env.example
+++ b/server/.env.example
@@ -1,6 +1,7 @@
 PORT=3000 # 8080 if deploying in fly.io
 NODE_ENV="development | production | test"
 OPENAI_API_KEY="<your_openai_secret_key>"
+OPENAI_CHATGPT_MODEL="<your_openai_chatgpt_model>"
 WEBSITE_URL="<your_front_end_url>"
 UNSPLASH_ACCESS_KEY="<your_unpslash_access_key>"
 UNSPLASH_SECRET_KEY="<your_unpslash_secret_key>"
diff --git a/server/src/controllers/openai.controller.ts b/server/src/controllers/openai.controller.ts
index dba2429..64ea465 100644
--- a/server/src/controllers/openai.controller.ts
+++ b/server/src/controllers/openai.controller.ts
@@ -53,7 +53,7 @@ export const generateIdea = async (req: BodyRequest<IdeaRequest>, res: Response,
     `;
 
     const completion = await openai.chat.completions.create({
-      model: "gpt-3.5-turbo-0613",
+      model: process.env.OPENAI_CHATGPT_MODEL,
       response_format: {
         type: "json_object",
       },
@@ -109,7 +109,7 @@ export const explainProjectByTitle = async (req: BodyRequest<ExplainRequest>, re
     `;
 
     const completion = await openai.chat.completions.create({
-      model: "gpt-3.5-turbo-0613",
+      model: process.env.OPENAI_CHATGPT_MODEL,
       messages: [
         {
           role: "system",
diff --git a/server/src/utils/env.ts b/server/src/utils/env.ts
index f6f1c6b..cd575d5 100644
--- a/server/src/utils/env.ts
+++ b/server/src/utils/env.ts
@@ -4,6 +4,33 @@ const environmentSchema = z.object({
   PORT: z.number().default(3000),
   NODE_ENV: z.enum(["development", "production", "test"]).default("development"),
   OPENAI_API_KEY: z.string(),
+  OPENAI_CHATGPT_MODEL: z
+    .enum([
+      "gpt-3.5-turbo-0125",
+      "gpt-3.5-turbo",
+      "gpt-3.5-turbo-1106",
+      "gpt-3.5-turbo-instruct",
+      "gpt-3.5-turbo-16k",
+      "gpt-3.5-turbo-0613",
+      "gpt-3.5-turbo-16k-0613",
+      "gpt-4-0125-preview",
+      "gpt-4-turbo-preview",
+      "gpt-4-1106-preview",
+      "gpt-4-vision-preview",
+      "gpt-4-1106-vision-preview",
+      "gpt-4",
+      "gpt-4-0613",
+      "gpt-4-32k",
+      "gpt-4-32k-0613",
+    ])
+    .refine((value) => {
+      if (["gpt-3.5-turbo-16k", "gpt-3.5-turbo-0613", "gpt-3.5-turbo-16k-0613"].includes(value)) {
+        console.warn(`WARNING: ${value} is a legacy model and will be deprecated on June 13, 2024.`);
+      }
+
+      return true;
+    })
+    .default("gpt-3.5-turbo-0613"),
   WEBSITE_URL: z.string(),
   UNSPLASH_ACCESS_KEY: z.string(),
   UNSPLASH_SECRET_KEY: z.string(),
@@ -34,6 +61,7 @@ const env = {
   PORT: process.env.PORT ? Number(process.env.PORT) : 3000,
   NODE_ENV: process.env.NODE_ENV,
   OPENAI_API_KEY: process.env.OPENAI_API_KEY,
+  OPENAI_CHATGPT_MODEL: process.env.OPENAI_CHATGPT_MODEL,
   WEBSITE_URL: process.env.WEBSITE_URL,
   UNSPLASH_ACCESS_KEY: process.env.UNSPLASH_ACCESS_KEY,
   UNSPLASH_SECRET_KEY: process.env.UNSPLASH_SECRET_KEY,