diff --git a/litellm/model_prices_and_context_window_backup.json b/litellm/model_prices_and_context_window_backup.json
index cbca0744ed9..70b6b05e6ec 100644
--- a/litellm/model_prices_and_context_window_backup.json
+++ b/litellm/model_prices_and_context_window_backup.json
@@ -23503,6 +23503,76 @@
         "supports_system_messages": true,
         "supports_tool_choice": true
     },
+    "gpt-realtime-2.1": {
+        "cache_creation_input_audio_token_cost": 4e-07,
+        "cache_read_input_audio_token_cost": 4e-07,
+        "cache_read_input_token_cost": 4e-07,
+        "input_cost_per_audio_token": 3.2e-05,
+        "input_cost_per_image": 5e-06,
+        "input_cost_per_token": 4e-06,
+        "litellm_provider": "openai",
+        "max_input_tokens": 128000,
+        "max_output_tokens": 32000,
+        "max_tokens": 32000,
+        "mode": "chat",
+        "output_cost_per_audio_token": 6.4e-05,
+        "output_cost_per_token": 2.4e-05,
+        "regional_processing_uplift_multiplier_eu": 1.1,
+        "regional_processing_uplift_multiplier_us": 1.1,
+        "supported_endpoints": [
+            "/v1/realtime"
+        ],
+        "supported_modalities": [
+            "text",
+            "image",
+            "audio"
+        ],
+        "supported_output_modalities": [
+            "text",
+            "audio"
+        ],
+        "supports_audio_input": true,
+        "supports_audio_output": true,
+        "supports_function_calling": true,
+        "supports_parallel_function_calling": true,
+        "supports_system_messages": true,
+        "supports_tool_choice": true
+    },
+    "gpt-realtime-2.1-mini": {
+        "cache_creation_input_audio_token_cost": 3e-07,
+        "cache_read_input_audio_token_cost": 3e-07,
+        "cache_read_input_token_cost": 6e-08,
+        "input_cost_per_audio_token": 1e-05,
+        "input_cost_per_image": 8e-07,
+        "input_cost_per_token": 6e-07,
+        "litellm_provider": "openai",
+        "max_input_tokens": 128000,
+        "max_output_tokens": 4096,
+        "max_tokens": 4096,
+        "mode": "chat",
+        "output_cost_per_audio_token": 2e-05,
+        "output_cost_per_token": 2.4e-06,
+        "regional_processing_uplift_multiplier_eu": 1.1,
+        "regional_processing_uplift_multiplier_us": 1.1,
+        "supported_endpoints": [
+            "/v1/realtime"
+        ],
+        "supported_modalities": [
+            "text",
+            "image",
+            "audio"
+        ],
+        "supported_output_modalities": [
+            "text",
+            "audio"
+        ],
+        "supports_audio_input": true,
+        "supports_audio_output": true,
+        "supports_function_calling": true,
+        "supports_parallel_function_calling": true,
+        "supports_system_messages": true,
+        "supports_tool_choice": true
+    },
     "gpt-realtime-mini": {
         "cache_creation_input_audio_token_cost": 3e-07,
         "cache_read_input_audio_token_cost": 3e-07,
diff --git a/model_prices_and_context_window.json b/model_prices_and_context_window.json
index 6cfa7c9e8be..b961c326625 100644
--- a/model_prices_and_context_window.json
+++ b/model_prices_and_context_window.json
@@ -23661,6 +23661,76 @@
         "supports_system_messages": true,
         "supports_tool_choice": true
     },
+    "gpt-realtime-2.1": {
+        "cache_creation_input_audio_token_cost": 4e-07,
+        "cache_read_input_audio_token_cost": 4e-07,
+        "cache_read_input_token_cost": 4e-07,
+        "input_cost_per_audio_token": 3.2e-05,
+        "input_cost_per_image": 5e-06,
+        "input_cost_per_token": 4e-06,
+        "litellm_provider": "openai",
+        "max_input_tokens": 128000,
+        "max_output_tokens": 32000,
+        "max_tokens": 32000,
+        "mode": "chat",
+        "output_cost_per_audio_token": 6.4e-05,
+        "output_cost_per_token": 2.4e-05,
+        "regional_processing_uplift_multiplier_eu": 1.1,
+        "regional_processing_uplift_multiplier_us": 1.1,
+        "supported_endpoints": [
+            "/v1/realtime"
+        ],
+        "supported_modalities": [
+            "text",
+            "image",
+            "audio"
+        ],
+        "supported_output_modalities": [
+            "text",
+            "audio"
+        ],
+        "supports_audio_input": true,
+        "supports_audio_output": true,
+        "supports_function_calling": true,
+        "supports_parallel_function_calling": true,
+        "supports_system_messages": true,
+        "supports_tool_choice": true
+    },
+    "gpt-realtime-2.1-mini": {
+        "cache_creation_input_audio_token_cost": 3e-07,
+        "cache_read_input_audio_token_cost": 3e-07,
+        "cache_read_input_token_cost": 6e-08,
+        "input_cost_per_audio_token": 1e-05,
+        "input_cost_per_image": 8e-07,
+        "input_cost_per_token": 6e-07,
+        "litellm_provider": "openai",
+        "max_input_tokens": 128000,
+        "max_output_tokens": 4096,
+        "max_tokens": 4096,
+        "mode": "chat",
+        "output_cost_per_audio_token": 2e-05,
+        "output_cost_per_token": 2.4e-06,
+        "regional_processing_uplift_multiplier_eu": 1.1,
+        "regional_processing_uplift_multiplier_us": 1.1,
+        "supported_endpoints": [
+            "/v1/realtime"
+        ],
+        "supported_modalities": [
+            "text",
+            "image",
+            "audio"
+        ],
+        "supported_output_modalities": [
+            "text",
+            "audio"
+        ],
+        "supports_audio_input": true,
+        "supports_audio_output": true,
+        "supports_function_calling": true,
+        "supports_parallel_function_calling": true,
+        "supports_system_messages": true,
+        "supports_tool_choice": true
+    },
     "gpt-realtime-mini": {
         "cache_creation_input_audio_token_cost": 3e-07,
         "cache_read_input_audio_token_cost": 3e-07,
diff --git a/tests/test_litellm/litellm_core_utils/llm_cost_calc/test_llm_cost_calc_utils.py b/tests/test_litellm/litellm_core_utils/llm_cost_calc/test_llm_cost_calc_utils.py
index e9977efe47d..0e6c6061b46 100644
--- a/tests/test_litellm/litellm_core_utils/llm_cost_calc/test_llm_cost_calc_utils.py
+++ b/tests/test_litellm/litellm_core_utils/llm_cost_calc/test_llm_cost_calc_utils.py
@@ -1538,22 +1538,23 @@ def _local_model_cost_map():
             os.environ["LITELLM_LOCAL_MODEL_COST_MAP"] = prev_env
 
 
+@pytest.mark.parametrize("model", ["gpt-5.4", "gpt-realtime-2.1", "gpt-realtime-2.1-mini"])
 @pytest.mark.parametrize("data_residency", ["eu", "us"])
-def test_data_residency_applies_uplift(data_residency, _local_model_cost_map):
-    """gpt-5.4 should apply the regional processing uplift multiplier when
-    data_residency is set. gpt-5.4+ (released 2026-03-05) carry the 10% uplift;
-    gpt-5 and older models do not."""
+def test_data_residency_applies_uplift(data_residency, model, _local_model_cost_map):
+    """Models released on/after 2026-03-05 (gpt-5.4/5.5 and gpt-realtime-2.1
+    series) apply the 10% regional processing uplift multiplier when
+    data_residency is set; gpt-5 and older models do not."""
     from litellm.types.utils import Usage
 
     usage = Usage(prompt_tokens=1000, completion_tokens=500, total_tokens=1500)
 
     base = generic_cost_per_token(
-        model="gpt-5.4",
+        model=model,
         usage=usage,
         custom_llm_provider="openai",
     )
     regional = generic_cost_per_token(
-        model="gpt-5.4",
+        model=model,
         usage=usage,
         custom_llm_provider="openai",
         data_residency=data_residency,