diff --git a/packages/jupyter-ai-magics/jupyter_ai_magics/magics.py b/packages/jupyter-ai-magics/jupyter_ai_magics/magics.py
index b5741a19b..dc5675b4f 100644
--- a/packages/jupyter-ai-magics/jupyter_ai_magics/magics.py
+++ b/packages/jupyter-ai-magics/jupyter_ai_magics/magics.py
@@ -518,14 +518,11 @@ def run_ai_cell(self, args: CellArgs, prompt: str):
             provider_params["request_schema"] = args.request_schema
             provider_params["response_path"] = args.response_path
 
-            # Validate that the request schema is well-formed JSON
-            try:
-                json.loads(args.request_schema)
-            except json.JSONDecodeError as e:
-                raise ValueError(
-                    "request-schema must be valid JSON. "
-                    f"Error at line {e.lineno}, column {e.colno}: {e.msg}"
-                ) from None
+            if args.model_kwargs:
+                provider_params["model_kwargs"] = args.model_kwargs
+
+            if args.endpoint_kwargs:
+                provider_params["endpoint_kwargs"] = args.endpoint_kwargs
 
         provider = Provider(**provider_params)
 
diff --git a/packages/jupyter-ai-magics/jupyter_ai_magics/parsers.py b/packages/jupyter-ai-magics/jupyter_ai_magics/parsers.py
index deffb3176..da4e889b1 100644
--- a/packages/jupyter-ai-magics/jupyter_ai_magics/parsers.py
+++ b/packages/jupyter-ai-magics/jupyter_ai_magics/parsers.py
@@ -1,3 +1,4 @@
+import json
 from typing import Literal, Optional, get_args
 
 import click
@@ -33,14 +34,14 @@
 )
 
 ENDPOINT_ARGS_SHORT_OPTION = "-e"
-ENDPOINT_ARGS_LONG_OPTION = "--endpoint-args"
+ENDPOINT_ARGS_LONG_OPTION = "--endpoint-kwargs"
 ENDPOINT_ARGS_HELP = (
     "A JSON value that specifies extra values that will be passed "
     "to the SageMaker Endpoint invoke function."
 )
 
 MODEL_ARGS_SHORT_OPTION = "-m"
-MODEL_ARGS_LONG_OPTION = "--model-args"
+MODEL_ARGS_LONG_OPTION = "--model-kwargs"
 MODEL_ARGS_HELP = (
     "A JSON value that specifies extra values that will be passed to"
     "the payload body of the invoke function. This can be useful to"
@@ -58,6 +59,8 @@ class CellArgs(BaseModel):
     region_name: Optional[str]
     request_schema: Optional[str]
     response_path: Optional[str]
+    model_kwargs: Optional[str]
+    endpoint_kwargs: Optional[str]
 
 
 # Should match CellArgs, but without "reset"
@@ -109,6 +112,19 @@ def get_help(self, ctx):
             click.echo(super().get_help(ctx))
 
 
+def verify_json_value(ctx, param, value):
+    if not value:
+        return value
+    try:
+        json.loads(value)
+    except json.JSONDecodeError as e:
+        raise ValueError(
+            f"{param.get_error_hint(ctx)} must be valid JSON. "
+            f"Error at line {e.lineno}, column {e.colno}: {e.msg}"
+        )
+    return value
+
+
 @click.command()
 @click.argument("model_id")
 @click.option(
@@ -136,6 +152,7 @@ def get_help(self, ctx):
     REQUEST_SCHEMA_LONG_OPTION,
     required=False,
     help=REQUEST_SCHEMA_HELP,
+    callback=verify_json_value,
 )
 @click.option(
     RESPONSE_PATH_SHORT_OPTION,
@@ -148,6 +165,14 @@ def get_help(self, ctx):
     ENDPOINT_ARGS_LONG_OPTION,
     required=False,
     help=ENDPOINT_ARGS_HELP,
+    callback=verify_json_value,
+)
+@click.option(
+    MODEL_ARGS_SHORT_OPTION,
+    MODEL_ARGS_LONG_OPTION,
+    required=False,
+    help=MODEL_ARGS_HELP,
+    callback=verify_json_value,
 )
 def cell_magic_parser(**kwargs):
     """
@@ -188,6 +213,7 @@ def line_magic_parser():
     REQUEST_SCHEMA_LONG_OPTION,
     required=False,
     help=REQUEST_SCHEMA_HELP,
+    callback=verify_json_value,
 )
 @click.option(
     RESPONSE_PATH_SHORT_OPTION,
@@ -195,6 +221,20 @@ def line_magic_parser():
     required=False,
     help=RESPONSE_PATH_HELP,
 )
+@click.option(
+    ENDPOINT_ARGS_SHORT_OPTION,
+    ENDPOINT_ARGS_LONG_OPTION,
+    required=False,
+    help=ENDPOINT_ARGS_HELP,
+    callback=verify_json_value,
+)
+@click.option(
+    MODEL_ARGS_SHORT_OPTION,
+    MODEL_ARGS_LONG_OPTION,
+    required=False,
+    help=MODEL_ARGS_HELP,
+    callback=verify_json_value,
+)
 def error_subparser(**kwargs):
     """
     Explains the most recent error. Takes the same options (except -r) as
diff --git a/packages/jupyter-ai-magics/jupyter_ai_magics/providers.py b/packages/jupyter-ai-magics/jupyter_ai_magics/providers.py
index 933d834ea..edc139d5e 100644
--- a/packages/jupyter-ai-magics/jupyter_ai_magics/providers.py
+++ b/packages/jupyter-ai-magics/jupyter_ai_magics/providers.py
@@ -677,8 +677,14 @@ class BedrockProvider(BaseProvider, Bedrock):
             format="text",
         ),
         TextField(key="region_name", label="Region name (optional)", format="text"),
+        MultilineTextField(key="model_kwargs", label="Model Arguments", format="json"),
     ]
 
+    def __init__(self, *args, **kwargs):
+        model_kwargs = pop_with_default(kwargs, "model_kwargs", "{}")
+        model_kwargs = json.loads(model_kwargs)
+        super().__init__(*args, **kwargs, model_kwargs=model_kwargs)
+
     async def _acall(self, *args, **kwargs) -> Coroutine[Any, Any, str]:
         return await self._call_in_executor(*args, **kwargs)
 
@@ -701,8 +707,14 @@ class BedrockChatProvider(BaseProvider, BedrockChat):
             format="text",
         ),
         TextField(key="region_name", label="Region name (optional)", format="text"),
+        MultilineTextField(key="model_kwargs", label="Model Arguments", format="json"),
     ]
 
+    def __init__(self, *args, **kwargs):
+        model_kwargs = pop_with_default(kwargs, "model_kwargs", "{}")
+        model_kwargs = json.loads(model_kwargs)
+        super().__init__(*args, **kwargs, model_kwargs=model_kwargs)
+
     async def _acall(self, *args, **kwargs) -> Coroutine[Any, Any, str]:
         return await self._call_in_executor(*args, **kwargs)