diff --git a/backend/package-lock.json b/backend/package-lock.json
index 4007021..ce23471 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -8,44 +8,42 @@
             "name": "resias-backend",
             "version": "0.1.0",
             "dependencies": {
+                "@anthropic-ai/sdk": "^0.74.0",
                 "cors": "^2.8.5",
                 "dotenv": "^16.4.7",
-                "express": "^4.21.2",
-                "openai": "^4.82.0"
+                "express": "^4.21.2"
             },
             "devDependencies": {
                 "nodemon": "^3.1.9"
             }
         },
-        "node_modules/@types/node": {
-            "version": "18.19.130",
-            "resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.130.tgz",
-            "integrity": "sha512-GRaXQx6jGfL8sKfaIDD6OupbIHBr9jv7Jnaml9tB7l4v068PAOXqfcujMMo5PhbIs6ggR1XODELqahT2R8v0fg==",
+        "node_modules/@anthropic-ai/sdk": {
+            "version": "0.74.0",
+            "resolved": "https://registry.npmjs.org/@anthropic-ai/sdk/-/sdk-0.74.0.tgz",
+            "integrity": "sha512-srbJV7JKsc5cQ6eVuFzjZO7UR3xEPJqPamHFIe29bs38Ij2IripoAhC0S5NslNbaFUYqBKypmmpzMTpqfHEUDw==",
             "license": "MIT",
             "dependencies": {
-                "undici-types": "~5.26.4"
-            }
-        },
-        "node_modules/@types/node-fetch": {
-            "version": "2.6.13",
-            "resolved": "https://registry.npmjs.org/@types/node-fetch/-/node-fetch-2.6.13.tgz",
-            "integrity": "sha512-QGpRVpzSaUs30JBSGPjOg4Uveu384erbHBoT1zeONvyCfwQxIkUshLAOqN/k9EjGviPRmWTTe6aH2qySWKTVSw==",
-            "license": "MIT",
-            "dependencies": {
-                "@types/node": "*",
-                "form-data": "^4.0.4"
-            }
-        },
-        "node_modules/abort-controller": {
-            "version": "3.0.0",
-            "resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
-            "integrity": "sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==",
-            "license": "MIT",
-            "dependencies": {
-                "event-target-shim": "^5.0.0"
+                "json-schema-to-ts": "^3.1.1"
             },
+            "bin": {
+                "anthropic-ai-sdk": "bin/cli"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.0 || ^4.0.0"
+            },
+            "peerDependenciesMeta": {
+                "zod": {
+                    "optional": true
+                }
+            }
+        },
+        "node_modules/@babel/runtime": {
+            "version": "7.28.6",
+            "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.28.6.tgz",
+            "integrity": "sha512-05WQkdpL9COIMz4LjTxGpPNCdlpyimKppYNoJ5Di5EUObifl8t4tuLuUBBZEpoLYOmfvIWrsp9fCl0HoPRVTdA==",
+            "license": "MIT",
             "engines": {
-                "node": ">=6.5"
+                "node": ">=6.9.0"
             }
         },
         "node_modules/accepts": {
@@ -61,18 +59,6 @@
                 "node": ">= 0.6"
             }
         },
-        "node_modules/agentkeepalive": {
-            "version": "4.6.0",
-            "resolved": "https://registry.npmjs.org/agentkeepalive/-/agentkeepalive-4.6.0.tgz",
-            "integrity": "sha512-kja8j7PjmncONqaTsB8fQ+wE2mSU2DJ9D4XKoJ5PFWIdRMa6SLSN1ff4mOr4jCbfRSsxR4keIiySJU0N9T5hIQ==",
-            "license": "MIT",
-            "dependencies": {
-                "humanize-ms": "^1.2.1"
-            },
-            "engines": {
-                "node": ">= 8.0.0"
-            }
-        },
         "node_modules/anymatch": {
             "version": "3.1.3",
             "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.3.tgz",
@@ -93,12 +79,6 @@
             "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
             "license": "MIT"
         },
-        "node_modules/asynckit": {
-            "version": "0.4.0",
-            "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-            "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
-            "license": "MIT"
-        },
         "node_modules/balanced-match": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
@@ -230,18 +210,6 @@
                 "fsevents": "~2.3.2"
             }
         },
-        "node_modules/combined-stream": {
-            "version": "1.0.8",
-            "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
-            "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
-            "license": "MIT",
-            "dependencies": {
-                "delayed-stream": "~1.0.0"
-            },
-            "engines": {
-                "node": ">= 0.8"
-            }
-        },
         "node_modules/concat-map": {
             "version": "0.0.1",
             "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -311,15 +279,6 @@
                 "ms": "2.0.0"
             }
         },
-        "node_modules/delayed-stream": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
-            "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
-            "license": "MIT",
-            "engines": {
-                "node": ">=0.4.0"
-            }
-        },
         "node_modules/depd": {
             "version": "2.0.0",
             "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
@@ -410,21 +369,6 @@
                 "node": ">= 0.4"
             }
         },
-        "node_modules/es-set-tostringtag": {
-            "version": "2.1.0",
-            "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.1.0.tgz",
-            "integrity": "sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==",
-            "license": "MIT",
-            "dependencies": {
-                "es-errors": "^1.3.0",
-                "get-intrinsic": "^1.2.6",
-                "has-tostringtag": "^1.0.2",
-                "hasown": "^2.0.2"
-            },
-            "engines": {
-                "node": ">= 0.4"
-            }
-        },
         "node_modules/escape-html": {
             "version": "1.0.3",
             "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -440,15 +384,6 @@
                 "node": ">= 0.6"
             }
         },
-        "node_modules/event-target-shim": {
-            "version": "5.0.1",
-            "resolved": "https://registry.npmjs.org/event-target-shim/-/event-target-shim-5.0.1.tgz",
-            "integrity": "sha512-i/2XbnSz/uxRCU6+NdVJgKWDTM427+MqYbkQzD321DuCQJUqOuJKIA0IM2+W2xtYHdKOmZ4dR6fExsd4SXL+WQ==",
-            "license": "MIT",
-            "engines": {
-                "node": ">=6"
-            }
-        },
         "node_modules/express": {
             "version": "4.22.1",
             "resolved": "https://registry.npmjs.org/express/-/express-4.22.1.tgz",
@@ -526,41 +461,6 @@
                 "node": ">= 0.8"
             }
         },
-        "node_modules/form-data": {
-            "version": "4.0.5",
-            "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.5.tgz",
-            "integrity": "sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w==",
-            "license": "MIT",
-            "dependencies": {
-                "asynckit": "^0.4.0",
-                "combined-stream": "^1.0.8",
-                "es-set-tostringtag": "^2.1.0",
-                "hasown": "^2.0.2",
-                "mime-types": "^2.1.12"
-            },
-            "engines": {
-                "node": ">= 6"
-            }
-        },
-        "node_modules/form-data-encoder": {
-            "version": "1.7.2",
-            "resolved": "https://registry.npmjs.org/form-data-encoder/-/form-data-encoder-1.7.2.tgz",
-            "integrity": "sha512-qfqtYan3rxrnCk1VYaA4H+Ms9xdpPqvLZa6xmMgFvhO32x7/3J/ExcTd6qpxM0vH2GdMI+poehyBZvqfMTto8A==",
-            "license": "MIT"
-        },
-        "node_modules/formdata-node": {
-            "version": "4.4.1",
-            "resolved": "https://registry.npmjs.org/formdata-node/-/formdata-node-4.4.1.tgz",
-            "integrity": "sha512-0iirZp3uVDjVGt9p49aTaqjk84TrglENEDuqfdlZQ1roC9CWlPk6Avf8EEnZNcAqPonwkG35x4n3ww/1THYAeQ==",
-            "license": "MIT",
-            "dependencies": {
-                "node-domexception": "1.0.0",
-                "web-streams-polyfill": "4.0.0-beta.3"
-            },
-            "engines": {
-                "node": ">= 12.20"
-            }
-        },
         "node_modules/forwarded": {
             "version": "0.2.0",
             "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -687,21 +587,6 @@
                 "url": "https://github.com/sponsors/ljharb"
             }
         },
-        "node_modules/has-tostringtag": {
-            "version": "1.0.2",
-            "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.2.tgz",
-            "integrity": "sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw==",
-            "license": "MIT",
-            "dependencies": {
-                "has-symbols": "^1.0.3"
-            },
-            "engines": {
-                "node": ">= 0.4"
-            },
-            "funding": {
-                "url": "https://github.com/sponsors/ljharb"
-            }
-        },
         "node_modules/hasown": {
             "version": "2.0.2",
             "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.2.tgz",
@@ -734,15 +619,6 @@
                 "url": "https://opencollective.com/express"
             }
         },
-        "node_modules/humanize-ms": {
-            "version": "1.2.1",
-            "resolved": "https://registry.npmjs.org/humanize-ms/-/humanize-ms-1.2.1.tgz",
-            "integrity": "sha512-Fl70vYtsAFb/C06PTS9dZBo7ihau+Tu/DNCk/OyHhea07S+aeMWpFFkUaXRa8fI+ScZbEI8dfSxwY7gxZ9SAVQ==",
-            "license": "MIT",
-            "dependencies": {
-                "ms": "^2.0.0"
-            }
-        },
         "node_modules/iconv-lite": {
             "version": "0.4.24",
             "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
@@ -823,6 +699,19 @@
                 "node": ">=0.12.0"
             }
         },
+        "node_modules/json-schema-to-ts": {
+            "version": "3.1.1",
+            "resolved": "https://registry.npmjs.org/json-schema-to-ts/-/json-schema-to-ts-3.1.1.tgz",
+            "integrity": "sha512-+DWg8jCJG2TEnpy7kOm/7/AxaYoaRbjVB4LFZLySZlWn8exGs3A4OLJR966cVvU26N7X9TWxl+Jsw7dzAqKT6g==",
+            "license": "MIT",
+            "dependencies": {
+                "@babel/runtime": "^7.18.3",
+                "ts-algebra": "^2.0.0"
+            },
+            "engines": {
+                "node": ">=16"
+            }
+        },
         "node_modules/math-intrinsics": {
             "version": "1.1.0",
             "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
@@ -920,46 +809,6 @@
                 "node": ">= 0.6"
             }
         },
-        "node_modules/node-domexception": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
-            "integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
-            "deprecated": "Use your platform's native DOMException instead",
-            "funding": [
-                {
-                    "type": "github",
-                    "url": "https://github.com/sponsors/jimmywarting"
-                },
-                {
-                    "type": "github",
-                    "url": "https://paypal.me/jimmywarting"
-                }
-            ],
-            "license": "MIT",
-            "engines": {
-                "node": ">=10.5.0"
-            }
-        },
-        "node_modules/node-fetch": {
-            "version": "2.7.0",
-            "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.7.0.tgz",
-            "integrity": "sha512-c4FRfUm/dbcWZ7U+1Wq0AwCyFL+3nt2bEw05wfxSz+DWpWsitgmSgYmy2dQdWyKC1694ELPqMs/YzUSNozLt8A==",
-            "license": "MIT",
-            "dependencies": {
-                "whatwg-url": "^5.0.0"
-            },
-            "engines": {
-                "node": "4.x || >=6.0.0"
-            },
-            "peerDependencies": {
-                "encoding": "^0.1.0"
-            },
-            "peerDependenciesMeta": {
-                "encoding": {
-                    "optional": true
-                }
-            }
-        },
         "node_modules/nodemon": {
             "version": "3.1.11",
             "resolved": "https://registry.npmjs.org/nodemon/-/nodemon-3.1.11.tgz",
@@ -1057,36 +906,6 @@
                 "node": ">= 0.8"
             }
         },
-        "node_modules/openai": {
-            "version": "4.104.0",
-            "resolved": "https://registry.npmjs.org/openai/-/openai-4.104.0.tgz",
-            "integrity": "sha512-p99EFNsA/yX6UhVO93f5kJsDRLAg+CTA2RBqdHK4RtK8u5IJw32Hyb2dTGKbnnFmnuoBv5r7Z2CURI9sGZpSuA==",
-            "license": "Apache-2.0",
-            "dependencies": {
-                "@types/node": "^18.11.18",
-                "@types/node-fetch": "^2.6.4",
-                "abort-controller": "^3.0.0",
-                "agentkeepalive": "^4.2.1",
-                "form-data-encoder": "1.7.2",
-                "formdata-node": "^4.3.2",
-                "node-fetch": "^2.6.7"
-            },
-            "bin": {
-                "openai": "bin/cli"
-            },
-            "peerDependencies": {
-                "ws": "^8.18.0",
-                "zod": "^3.23.8"
-            },
-            "peerDependenciesMeta": {
-                "ws": {
-                    "optional": true
-                },
-                "zod": {
-                    "optional": true
-                }
-            }
-        },
         "node_modules/parseurl": {
             "version": "1.3.3",
             "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
@@ -1416,10 +1235,10 @@
                 "nodetouch": "bin/nodetouch.js"
             }
         },
-        "node_modules/tr46": {
-            "version": "0.0.3",
-            "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
-            "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==",
+        "node_modules/ts-algebra": {
+            "version": "2.0.0",
+            "resolved": "https://registry.npmjs.org/ts-algebra/-/ts-algebra-2.0.0.tgz",
+            "integrity": "sha512-FPAhNPFMrkwz76P7cdjdmiShwMynZYN6SgOujD1urY4oNm80Ou9oMdmbR45LotcKOXoy7wSmHkRFE6Mxbrhefw==",
             "license": "MIT"
         },
         "node_modules/type-is": {
@@ -1442,12 +1261,6 @@
             "dev": true,
             "license": "MIT"
         },
-        "node_modules/undici-types": {
-            "version": "5.26.5",
-            "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
-            "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
-            "license": "MIT"
-        },
         "node_modules/unpipe": {
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -1474,31 +1287,6 @@
             "engines": {
                 "node": ">= 0.8"
             }
-        },
-        "node_modules/web-streams-polyfill": {
-            "version": "4.0.0-beta.3",
-            "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-4.0.0-beta.3.tgz",
-            "integrity": "sha512-QW95TCTaHmsYfHDybGMwO5IJIM93I/6vTRk+daHTWFPhwh+C8Cg7j7XyKrwrj8Ib6vYXe0ocYNrmzY4xAAN6ug==",
-            "license": "MIT",
-            "engines": {
-                "node": ">= 14"
-            }
-        },
-        "node_modules/webidl-conversions": {
-            "version": "3.0.1",
-            "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
-            "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
-            "license": "BSD-2-Clause"
-        },
-        "node_modules/whatwg-url": {
-            "version": "5.0.0",
-            "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
-            "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
-            "license": "MIT",
-            "dependencies": {
-                "tr46": "~0.0.3",
-                "webidl-conversions": "^3.0.0"
-            }
         }
     }
 }
diff --git a/backend/package.json b/backend/package.json
index e6015ae..a2db9dd 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -5,16 +5,16 @@
     "type": "module",
     "main": "server.js",
     "scripts": {
-      "start": "node server.js",
-      "dev": "nodemon server.js"
+        "start": "node server.js",
+        "dev": "nodemon server.js"
     },
     "dependencies": {
-      "cors": "^2.8.5",
-      "dotenv": "^16.4.7",
-      "express": "^4.21.2",
-      "openai": "^4.82.0"
+        "@anthropic-ai/sdk": "^0.74.0",
+        "cors": "^2.8.5",
+        "dotenv": "^16.4.7",
+        "express": "^4.21.2"
     },
     "devDependencies": {
-      "nodemon": "^3.1.9"
+        "nodemon": "^3.1.9"
     }
-  }
\ No newline at end of file
+}
diff --git a/backend/services/clustering.service.js b/backend/services/clustering.service.js
index 8b13789..30db22f 100644
--- a/backend/services/clustering.service.js
+++ b/backend/services/clustering.service.js
@@ -1 +1,19 @@
+import Anthropic from "@anthropic-ai/sdk";
+import anthropicApiKey from "../.secrets";
 
+const client = new Anthropic({
+  apiKey: anthropicApiKey 
+});
+
+const prompt = `You are a helpful assistant that analyzes notes for semantic similarity. Each note is a json object with the 
+various attributes. For clustering purposes, the relvant attribute is "text". Analze the text attributes of the notes and return a json object with the following structure: {{$notes}}`;
+
+export const clusterNotes = async (notes) => {
+  const response = await client.messages.create({
+  model: "claude-opus-4-6",
+    messages: [
+      { role: "user", content: `${prompt}`}
+    ]
+  });
+  return response.content[0].text;
+};
\ No newline at end of file