diff --git a/agent/model_metadata.py b/agent/model_metadata.py
index 45baf18f3c311..3792661cdbec7 100644
--- a/agent/model_metadata.py
+++ b/agent/model_metadata.py
@@ -506,6 +506,7 @@ DEFAULT_CONTEXT_LENGTHS = {
     "grok-2-vision": 8192,      # grok-2-vision, -1212, -latest
     "grok-4-fast": 2000000,     # grok-4-fast-(non-)reasoning, also matches -reasoning
     "grok-4.20": 2000000,       # grok-4.20-0309-(non-)reasoning, -multi-agent-0309
+    "grok-4.6": 500000,         # grok-4.6 — 500K context (OpenRouter / docs.x.ai)
     "grok-4.5": 500000,         # grok-4.5, grok-4.5-latest — 500K context per docs.x.ai
     "grok-4.3": 1000000,        # grok-4.3, grok-4.3-latest — 1M context per docs.x.ai
     "grok-4": 256000,           # grok-4, grok-4-0709
@@ -580,6 +581,8 @@ _GROK_EFFORT_CAPABLE_PREFIXES = (
     # "none" ("This model does not support `reasoning_effort` value `none`"),
     # unlike grok-4.3. models.dev agrees: effort values [low, medium, high].
     "grok-4.5",
+    # grok-4.6: drop-in successor of grok-4.5 (same effort dial).
+    "grok-4.6",
 )
 
 
diff --git a/agent/reasoning_timeouts.py b/agent/reasoning_timeouts.py
index a0b32e925ac20..486acad1939f7 100644
--- a/agent/reasoning_timeouts.py
+++ b/agent/reasoning_timeouts.py
@@ -123,6 +123,7 @@ _REASONING_STALE_TIMEOUT_FLOORS: tuple[tuple[str, int], ...] = (
     ("grok-4-fast-reasoning", 300),
     ("grok-4.20-reasoning", 300),
     ("grok-4.5", 300),
+    ("grok-4.6", 300),
     ("grok-4-fast-non-reasoning", 180),
 )
 
diff --git a/hermes_cli/models.py b/hermes_cli/models.py
index 3a809c5f1a644..cc44fc44a3b56 100644
--- a/hermes_cli/models.py
+++ b/hermes_cli/models.py
@@ -69,7 +69,7 @@ OPENROUTER_MODELS: list[tuple[str, str]] = [
     ("google/gemini-3.1-pro-preview",          ""),
     ("google/gemini-3.6-flash",                ""),
     # xAI
-    ("x-ai/grok-4.5",                          ""),
+    ("x-ai/grok-4.6",                          ""),
     # DeepSeek
     ("deepseek/deepseek-v4-pro",               ""),
     ("deepseek/deepseek-v4-flash",             ""),
@@ -241,7 +241,7 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "google/gemini-3.1-pro-preview",
         "google/gemini-3.6-flash",
         # xAI
-        "x-ai/grok-4.5",
+        "x-ai/grok-4.6",
         # DeepSeek
         "deepseek/deepseek-v4-pro",
         "deepseek/deepseek-v4-flash",
diff --git a/tests/agent/test_reasoning_stale_timeout_floor.py b/tests/agent/test_reasoning_stale_timeout_floor.py
index 2f1372ded4197..716c614dbe81e 100644
--- a/tests/agent/test_reasoning_stale_timeout_floor.py
+++ b/tests/agent/test_reasoning_stale_timeout_floor.py
@@ -83,6 +83,7 @@ import pytest
     ("x-ai/grok-4-fast-reasoning", 300.0),
     ("x-ai/grok-4.20-reasoning", 300.0),
     ("x-ai/grok-4.5", 300.0),
+    ("x-ai/grok-4.6", 300.0),
     ("x-ai/grok-4-fast-non-reasoning", 180.0),
 ])
 def test_reasoning_stale_timeout_floor_positive_cases(model, expected):
diff --git a/website/static/api/model-catalog.json b/website/static/api/model-catalog.json
index 946ea073cbef7..aa012e18a96b8 100644
--- a/website/static/api/model-catalog.json
+++ b/website/static/api/model-catalog.json
@@ -1,6 +1,6 @@
 {
   "version": 1,
-  "updated_at": "2026-08-03T22:03:15Z",
+  "updated_at": "2026-08-12T17:23:25Z",
   "metadata": {
     "source": "hermes-agent repo",
     "docs": "https://hermes-agent.nousresearch.com/docs/reference/model-catalog"
@@ -85,7 +85,7 @@
           "description": ""
         },
         {
-          "id": "x-ai/grok-4.5",
+          "id": "x-ai/grok-4.6",
           "description": ""
         },
         {
@@ -226,7 +226,7 @@
           "id": "google/gemini-3.6-flash"
         },
         {
-          "id": "x-ai/grok-4.5"
+          "id": "x-ai/grok-4.6"
         },
         {
           "id": "deepseek/deepseek-v4-pro"