diff --git a/src/main/java/com/easylead/easylead/domain/gpt/business/GptBusiness.java b/src/main/java/com/easylead/easylead/domain/gpt/business/GptBusiness.java
index 9909e7f..7c0bf02 100644
--- a/src/main/java/com/easylead/easylead/domain/gpt/business/GptBusiness.java
+++ b/src/main/java/com/easylead/easylead/domain/gpt/business/GptBusiness.java
@@ -25,4 +25,9 @@ public ResponseDTO getEasyToRead(String text) throws JsonProcessingException {
     public Flux<String> ask(String text) throws JsonProcessingException {
         return gptService.askStream(text);
     }
+
+    public ResponseDTO getEasyToReadCustom(String text) throws JsonProcessingException {
+        HttpRequest request = gptService.requestGPTCustom(text);
+        return gptConverter.toResponseDTO(gptService.responseGPT(request));
+    }
 }
diff --git a/src/main/java/com/easylead/easylead/domain/gpt/controller/GptController.java b/src/main/java/com/easylead/easylead/domain/gpt/controller/GptController.java
index 6418deb..c7bcaa6 100644
--- a/src/main/java/com/easylead/easylead/domain/gpt/controller/GptController.java
+++ b/src/main/java/com/easylead/easylead/domain/gpt/controller/GptController.java
@@ -40,5 +40,12 @@ public Flux<String> ask(Locale locale,
         }
     }
 
+    @GetMapping("/custom")
+    public ResponseEntity<ResponseDTO> easyLeadCustom(@RequestParam String text)
+        throws JsonProcessingException {
+        return ResponseEntity.ok(gptBusiness.getEasyToReadCustom(text));
+
+    }
+
 
 }
diff --git a/src/main/java/com/easylead/easylead/domain/gpt/service/GptService.java b/src/main/java/com/easylead/easylead/domain/gpt/service/GptService.java
index 8b35731..c7a59a0 100644
--- a/src/main/java/com/easylead/easylead/domain/gpt/service/GptService.java
+++ b/src/main/java/com/easylead/easylead/domain/gpt/service/GptService.java
@@ -32,6 +32,9 @@ public class GptService {
     @Value("${gpt.api_key}")
 
     private String gptApiKey;
+
+    @Value("${gpt.api_key_custom}")
+    private String gptApiCustomkey;
     private final ObjectMapper objectMapper = new ObjectMapper()
             .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
             .setPropertyNamingStrategy(PropertyNamingStrategies.SNAKE_CASE );
@@ -193,4 +196,29 @@ public Flux<String> askStream(String text) throws JsonProcessingException {
                 .bodyToFlux(String.class);
         return eventStream;
     }
+
+    public HttpRequest requestGPTCustom(String text) throws JsonProcessingException {
+        ObjectMapper mapper = new ObjectMapper();
+        List<Message> messages = new ArrayList<>();
+        // Assistant API 사용할지 Prompt를 변경할지 선택하기
+        // 시스템 역할 설정
+        messages.add(new Message(text, "user"));
+
+        ChatGPTRequestDTO chatGptRequest = new ChatGPTRequestDTO("ft:gpt-3.5-turbo-0125:personal::9klL6p0E", messages, 0.3,false);
+        String input = null;
+        input = mapper.writeValueAsString(chatGptRequest);
+        System.out.println(input);
+        System.out.println("apikey : " + gptApiCustomkey);
+
+        HttpRequest request = HttpRequest.newBuilder()
+            .uri(URI.create("https://api.openai.com/v1/chat/completions"))
+            .header("Content-Type", "application/json")
+            .header("Authorization", "Bearer " + gptApiCustomkey)
+            .POST(HttpRequest.BodyPublishers.ofString(input))
+            .build();
+
+        return request;
+
+
+    }
 }