fix: model not displaying properly [PRO-1072] (#4267)

* chore: fix model display

* chore: new ts

* chore: fix model rendering

---------

Co-authored-by: Shubham Naik <shub@memgpt.ai>

letta/schemas/llm_config.py

@@ -74,6 +74,7 @@ class LLMConfig(BaseModel):
         "medium",
         description="Soft control for how verbose model output should be, used for GPT-5 models.",
     )
+    tier: Optional[str] = Field(None, description="The cost tier for the model (cloud only).")
 
     # FIXME hack to silence pydantic protected namespace warning
     model_config = ConfigDict(protected_namespaces=())