diff --git a/hermes_cli/models.py b/hermes_cli/models.py
index 7b6c7d698ff19..5e474b5b34f6d 100644
--- a/hermes_cli/models.py
+++ b/hermes_cli/models.py
@@ -2904,6 +2904,7 @@ def resolve_fast_mode_overrides(model_id: Optional[str]) -> dict[str, Any] | Non
     Returns provider-appropriate overrides:
     - OpenAI models: ``{"service_tier": "priority"}`` (Priority Processing)
     - Anthropic models: ``{"speed": "fast"}`` (Anthropic Fast Mode beta)
+    - Grok 4.6: ``{"service_tier": "priority"}`` (xAI Priority Processing)
 
     The overrides are injected into the API request kwargs by
     ``_build_api_kwargs`` in run_agent.py — each API path handles its own