diff --git a/apps/server/src/provider/model-manifest.json b/apps/server/src/provider/model-manifest.json
index b7531c21c981..d9a1bc0f388e 100644
--- a/apps/server/src/provider/model-manifest.json
+++ b/apps/server/src/provider/model-manifest.json
@@ -1,6 +1,6 @@
 {
   "version": 1,
-  "updatedAt": "2026-09-24T18:40:00Z",
+  "updatedAt": "2026-09-28T19:22:00Z",
   "compatibility": [
     {
       "driver": "codex",
@@ -64,7 +64,7 @@
       "gpt-daybreak-blue-latest",
       "gpt-daybreak-red-latest"
     ],
-    "claudeAgent": ["claude-fable-5-1", "claude-opus-5-5", "claude-sonnet-5"],
+    "claudeAgent": ["claude-fable-5-1", "claude-opus-5-5", "claude-sonnet-5-5"],
     "antigravity": ["gemini-3.8-flash-high", "gemini-3.8-flash-medium", "gemini-3.8-flash-low"]
   },
   "providers": {
@@ -495,6 +495,42 @@
             "claudeCode": {}
           }
         },
+        "sonnet-5-5": {
+          "capabilities": {
+            "optionDescriptors": [
+              {
+                "id": "effort",
+                "label": "Reasoning",
+                "type": "select",
+                "options": [
+                  { "id": "low", "label": "Low" },
+                  { "id": "medium", "label": "Medium", "isDefault": true },
+                  { "id": "high", "label": "High" },
+                  { "id": "xhigh", "label": "Extra High" },
+                  { "id": "max", "label": "Max" },
+                  { "id": "ultrathink", "label": "Ultrathink" }
+                ],
+                "promptInjectedValues": ["ultrathink"]
+              },
+              {
+                "id": "contextWindow",
+                "label": "Context Window",
+                "type": "select",
+                "options": [
+                  { "id": "200k", "label": "200k", "isDefault": true },
+                  { "id": "1m", "label": "1M" }
+                ]
+              }
+            ]
+          },
+          "adapter": {
+            "claudeCode": {
+              "effortMap": { "ultrathink": null },
+              "modelSuffixes": { "contextWindow": { "1m": "[1m]" } },
+              "contextWindowTokens": { "200k": 200000, "1m": 1000000 }
+            }
+          }
+        },
         "sonnet-5": {
           "capabilities": {
             "optionDescriptors": [
@@ -731,11 +767,20 @@
           "status": "legacy",
           "profile": "opus-4-5"
         },
+        {
+          "slug": "claude-sonnet-5-5",
+          "name": "Claude Sonnet 5.5",
+          "aliases": ["sonnet-5.5", "claude-sonnet-5.5"],
+          "status": "current",
+          "badge": "new",
+          "profile": "sonnet-5-5",
+          "adapter": { "claudeCode": { "minVersion": "2.1.284" } }
+        },
         {
           "slug": "claude-sonnet-5",
           "name": "Claude Sonnet 5",
           "aliases": ["sonnet", "sonnet-5", "claude-sonnet-5.0", "claude-sonnet-5-0"],
-          "status": "current",
+          "status": "legacy",
           "profile": "sonnet-5"
         },
         {