diff --git a/src/backend/src/modules/puterai/ClaudeService.js b/src/backend/src/modules/puterai/ClaudeService.js
index b527d466..78b460a4 100644
--- a/src/backend/src/modules/puterai/ClaudeService.js
+++ b/src/backend/src/modules/puterai/ClaudeService.js
@@ -337,6 +337,19 @@ class ClaudeService extends BaseService {
     */
     async models_ () {
         return [
+            {
+                id: 'claude-sonnet-4-5',
+                aliases: ['claude-sonnet-4.5'],
+                name: 'Claude Sonnet 4.5',
+                context: 200000,
+                cost: {
+                    currency: 'usd-cents',
+                    tokens: 1_000_000,
+                    input: 300,
+                    output: 1500,
+                },
+                max_tokens: 64000,
+            },
             {
                 id: 'claude-opus-4-1-20250805',
                 aliases: ['claude-opus-4-1'],