diff --git a/js/api/anthropic.js b/js/api/anthropic.js
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index 00000000..30fe8663
--- /dev/null
+++ b/js/api/anthropic.js
@@ -0,0 +1,110 @@
+/*
+ *  ThunderAI [https://micz.it/thunderbird-addon-thunderai/]
+ *  Copyright (C) 2024 - 2025  Mic (m@micz.it)
+
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// Some original methods derived from https://github.com/ali-raheem/Aify/blob/4ece286095ea7a6cf89d696902e6b81b5d1c3a4b/plugin/html/API.js
+
+
+export class Anthropic {
+
+  apiKey = '';
+  version = '';
+  model = '';
+  developer_messages = '';
+  stream = false;
+
+  constructor(apiKey, version, model, developer_messages, stream) {
+    this.apiKey = apiKey;
+    this.version = version;
+    this.model = model;
+    this.developer_messages = developer_messages;
+    this.stream = stream;
+  }
+
+
+  fetchModels = async () => {
+    try{
+      const response = await fetch("https://api.anthropic.com/v1/models", {
+          method: "GET",
+          headers: {
+              "Content-Type": "application/json",
+              "x-api-key": this.apiKey,
+              "anthropic-version": this.version,
+          },
+      });
+
+      if (!response.ok) {
+          const errorDetail = await response.text();
+          let err_msg = "[ThunderAI] Anthropic API request failed: " + response.status + " " + response.statusText + ", Detail: " + errorDetail;
+          console.error(err_msg);
+          let output = {};
+          output.ok = false;
+          output.error = errorDetail;
+          return output;
+      }
+
+      let output = {};
+      output.ok = true;
+      let output_response = await response.json();
+      output.response = output_response.data;
+
+      return output;
+    }catch (error) {
+      console.error("[ThunderAI] Anthropic API request failed: " + error);
+      let output = {};
+      output.is_exception = true;
+      output.ok = false;
+      output.error = "Anthropic API request failed: " + error;
+      return output;
+    }
+  }
+
+  fetchResponse = async (messages, maxTokens = 0) => {
+
+    if(this.developer_messages !== ''){
+       messages.push({role: "developer", content: [{"type": "text", "text": this.developer_messages}]});
+    }
+
+    // console.log(">>>>>>>>>>> Anthropic API request: " + JSON.stringify(messages));
+
+    try {
+      const response = await fetch("https://api.anthropic.com/v1/messages", {
+          method: "POST",
+          headers: { 
+              "Content-Type": "application/json", 
+              "x-api-key": this.apiKey,
+              "anthropic-version": this.version,
+          },
+          body: JSON.stringify({ 
+              model: this.model, 
+              messages: messages,
+              stream: this.stream,
+              ...(maxTokens > 0 ? { 'max_tokens': parseInt(maxTokens) } : {})
+          }),
+      });
+      return response;
+    }catch (error) {
+        console.error("[ThunderAI] Anthropic API request failed: " + error);
+        let output = {};
+        output.is_exception = true;
+        output.ok = false;
+        output.error = "Anthropic API request failed: " + error;
+        return output;
+    }
+  }
+
+}
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