diff --git a/litellm/llms/bedrock/common_utils.py b/litellm/llms/bedrock/common_utils.py
index 5f044897b2c..eff8395a0fe 100644
--- a/litellm/llms/bedrock/common_utils.py
+++ b/litellm/llms/bedrock/common_utils.py
@@ -37,6 +37,8 @@ if TYPE_CHECKING:
 
 _ERROR_REQUEST_URL: Final = "https://docs.litellm.ai/docs"
 _OPENAI_FAMILY_MODEL_RE: Final = re.compile(r"(^|[./])openai\.")
+# Families with no invoke transformation; unmapped ids default to converse.
+_CONVERSE_ONLY_FAMILY_MODEL_RE: Final = re.compile(r"(^|[./])(minimax|nvidia|writer|zai|google|xai)\.")
 
 
 def error_response_text(response: httpx.Response) -> str:
@@ -1220,6 +1222,8 @@ class BedrockModelInfo(BaseLLMModelInfo):
             return "converse"
         if _OPENAI_FAMILY_MODEL_RE.search(base_model):
             return "converse"
+        if _CONVERSE_ONLY_FAMILY_MODEL_RE.search(base_model):
+            return "converse"
         return "invoke"
 
     @staticmethod
diff --git a/tests/unit/llms/bedrock/test_bedrock_common_utils.py b/tests/unit/llms/bedrock/test_bedrock_common_utils.py
index e5118f90e44..4c6b85871ba 100644
--- a/tests/unit/llms/bedrock/test_bedrock_common_utils.py
+++ b/tests/unit/llms/bedrock/test_bedrock_common_utils.py
@@ -981,3 +981,39 @@ def test_unmapped_openai_family_model_routes_to_converse():
     assert BedrockModelInfo.get_bedrock_route(unmapped) == "converse"
     imported: Final = "bedrock/openai/arn:aws:bedrock:us-east-1:123456789012:imported-model/abc123"
     assert BedrockModelInfo.get_bedrock_route(imported) == "openai"
+
+
+@pytest.mark.parametrize(
+    "unmapped",
+    [
+        "bedrock/minimax.minimax-m99-unmapped",
+        "bedrock/us.nvidia.nemotron-99b-unmapped",
+        "bedrock/writer.palmyra-x99-unmapped",
+        "bedrock/zai.glm-99-unmapped",
+        "bedrock/google.gemma-99-unmapped",
+        "bedrock/global.xai.grok-99-unmapped",
+    ],
+)
+def test_unmapped_converse_only_family_model_routes_to_converse(unmapped: str):
+    """Same rule as the OpenAI family, for the other Bedrock-native families with no invoke handler.
+
+    minimax, nvidia, writer, zai, google and xai have no transformation under
+    ``litellm/llms/bedrock/chat/invoke_transformations``; every id of theirs is served by Converse.
+    An id newer than the cost map used to fall to the invoke route, where
+    ``get_bedrock_invoke_provider`` returns ``None`` and the request fails, instead of Converse.
+    """
+    import litellm
+
+    assert BedrockModelInfo.get_base_model(unmapped) not in litellm.bedrock_converse_models
+    assert BedrockModelInfo.get_bedrock_route(unmapped) == "converse"
+
+
+def test_unmapped_model_of_family_with_invoke_handler_still_routes_to_invoke():
+    """The converse-only default is scoped to families without an invoke handler; ``meta`` has one."""
+    from typing import Final
+
+    import litellm
+
+    unmapped: Final = "bedrock/meta.llama99-unmapped-v1:0"
+    assert BedrockModelInfo.get_base_model(unmapped) not in litellm.bedrock_converse_models
+    assert BedrockModelInfo.get_bedrock_route(unmapped) == "invoke"