diff --git a/libs/partners/openrouter/langchain_openrouter/data/_profiles.py b/libs/partners/openrouter/langchain_openrouter/data/_profiles.py
index 580d510ff33..964c8ceb064 100644
--- a/libs/partners/openrouter/langchain_openrouter/data/_profiles.py
+++ b/libs/partners/openrouter/langchain_openrouter/data/_profiles.py
@@ -3508,6 +3508,27 @@ _PROFILES: dict[str, dict[str, Any]] = {
         "attachment": True,
         "temperature": True,
     },
+    "x-ai/grok-4.3": {
+        "name": "Grok 4.3",
+        "release_date": "2026-05-01",
+        "last_updated": "2026-05-01",
+        "open_weights": False,
+        "max_input_tokens": 1000000,
+        "max_output_tokens": 1000000,
+        "text_inputs": True,
+        "image_inputs": True,
+        "audio_inputs": False,
+        "video_inputs": False,
+        "text_outputs": True,
+        "image_outputs": False,
+        "audio_outputs": False,
+        "video_outputs": False,
+        "reasoning_output": True,
+        "tool_calling": True,
+        "structured_output": True,
+        "attachment": True,
+        "temperature": True,
+    },
     "x-ai/grok-code-fast-1": {
         "name": "Grok Code Fast 1",
         "release_date": "2025-08-26",