diff --git a/agent/model_metadata.py b/agent/model_metadata.py
index 7486afb04..66e97c0f8 100644
--- a/agent/model_metadata.py
+++ b/agent/model_metadata.py
@@ -113,6 +113,8 @@ DEFAULT_CONTEXT_LENGTHS = {
     "glm": 202752,
     # Kimi
     "kimi": 262144,
+    # Arcee
+    "trinity": 262144,
     # Hugging Face Inference Providers — model IDs use org/name format
     "Qwen/Qwen3.5-397B-A17B": 131072,
     "Qwen/Qwen3.5-35B-A3B": 131072,
diff --git a/hermes_cli/models.py b/hermes_cli/models.py
index 0915d150d..1243d160d 100644
--- a/hermes_cli/models.py
+++ b/hermes_cli/models.py
@@ -51,6 +51,7 @@ OPENROUTER_MODELS: list[tuple[str, str]] = [
     ("nvidia/nemotron-3-super-120b-a12b",      ""),
     ("nvidia/nemotron-3-super-120b-a12b:free", "free"),
     ("arcee-ai/trinity-large-preview:free", "free"),
+    ("arcee-ai/trinity-large-thinking",  ""),
     ("openai/gpt-5.4-pro",              ""),
     ("openai/gpt-5.4-nano",             ""),
 ]
@@ -82,6 +83,7 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "nvidia/nemotron-3-super-120b-a12b",
         "nvidia/nemotron-3-super-120b-a12b:free",
         "arcee-ai/trinity-large-preview:free",
+        "arcee-ai/trinity-large-thinking",
         "openai/gpt-5.4-pro",
         "openai/gpt-5.4-nano",
     ],