fix: recognize OpenAI context_length_exceeded errors (#47954)

litellm/litellm_core_utils/exception_mapping_utils.py

@@ -102,6 +102,7 @@ class ExceptionCheckers:
             "`inputs` tokens + `max_new_tokens` must be",
             "exceeds the available context size",  # llama.cpp/Lemonade
             "exceeds the maximum number of tokens allowed",  # Gemini
+            '"code": "context_length_exceeded"',
         ]
         for substring in known_exception_substrings:
             if substring in _error_str_lowercase:

tests/unit/litellm_core_utils/test_exception_mapping_utils.py

@@ -160,6 +160,12 @@ def test_api_base_line_keeps_an_at_sign_in_the_path(api_base: str) -> None:
 # Tuple format: (error_message, expected_result)
 context_window_test_cases = [
     # Positive cases (should return True)
+    (
+        '"{\n  "error": {\n    "message": "Your input exceeds the context window of this model. '
+        'Please adjust your input and try again.",\n    "type": "invalid_request_error",\n'
+        '    "param": "input",\n    "code": "context_length_exceeded"\n  }\n}"',
+        True,
+    ),
     (
         "An error occurred: The input exceeds the model's maximum context limit of 8192 tokens.",
         True,