diff --git a/pydantic_ai_slim/pydantic_ai/models/gemini.py b/pydantic_ai_slim/pydantic_ai/models/gemini.py
index 3efeaa2f2..48fc811ec 100644
--- a/pydantic_ai_slim/pydantic_ai/models/gemini.py
+++ b/pydantic_ai_slim/pydantic_ai/models/gemini.py
@@ -878,7 +878,7 @@ def _metadata_as_usage(response: _GeminiResponse) -> usage.Usage:
             metadata_details = cast(list[_GeminiModalityTokenCount], metadata_details)
             suffix = key.removesuffix('_details')
             for detail in metadata_details:
-                details[f'{detail["modality"].lower()}_{suffix}'] = detail['token_count']
+                details[f'{detail["modality"].lower()}_{suffix}'] = detail.get('token_count', 0)
 
     return usage.Usage(
         request_tokens=metadata.get('prompt_token_count', 0),
diff --git a/pydantic_ai_slim/pydantic_ai/models/google.py b/pydantic_ai_slim/pydantic_ai/models/google.py
index 83a601279..244dacede 100644
--- a/pydantic_ai_slim/pydantic_ai/models/google.py
+++ b/pydantic_ai_slim/pydantic_ai/models/google.py
@@ -603,7 +603,7 @@ def _metadata_as_usage(response: GenerateContentResponse) -> usage.Usage:
         if key.endswith('_details') and metadata_details:
             suffix = key.removesuffix('_details')
             for detail in metadata_details:
-                details[f'{detail["modality"].lower()}_{suffix}'] = detail['token_count']
+                details[f'{detail["modality"].lower()}_{suffix}'] = detail.get('token_count', 0)
 
     return usage.Usage(
         request_tokens=metadata.get('prompt_token_count', 0),