diff --git a/litellm/model_prices_and_context_window_backup.json b/litellm/model_prices_and_context_window_backup.json
index 2b6d2800124..9ea9f39b1db 100644
--- a/litellm/model_prices_and_context_window_backup.json
+++ b/litellm/model_prices_and_context_window_backup.json
@@ -1083,7 +1083,7 @@
         "supports_vision": true,
         "tool_use_system_prompt_tokens": 346
     },
-    "apac.anthropic.claude-opus-4-6-v1": {
+    "au.anthropic.claude-opus-4-6-v1": {
         "cache_creation_input_token_cost": 6.875e-06,
         "cache_creation_input_token_cost_above_200k_tokens": 1.375e-05,
         "cache_read_input_token_cost": 5.5e-07,
diff --git a/model_prices_and_context_window.json b/model_prices_and_context_window.json
index 2b6d2800124..9ea9f39b1db 100644
--- a/model_prices_and_context_window.json
+++ b/model_prices_and_context_window.json
@@ -1083,7 +1083,7 @@
         "supports_vision": true,
         "tool_use_system_prompt_tokens": 346
     },
-    "apac.anthropic.claude-opus-4-6-v1": {
+    "au.anthropic.claude-opus-4-6-v1": {
         "cache_creation_input_token_cost": 6.875e-06,
         "cache_creation_input_token_cost_above_200k_tokens": 1.375e-05,
         "cache_read_input_token_cost": 5.5e-07,
diff --git a/tests/test_litellm/test_claude_opus_4_6_config.py b/tests/test_litellm/test_claude_opus_4_6_config.py
index 071d0a26369..6ccba580bc2 100644
--- a/tests/test_litellm/test_claude_opus_4_6_config.py
+++ b/tests/test_litellm/test_claude_opus_4_6_config.py
@@ -8,6 +8,43 @@ import os
 import litellm
 
 
+def test_opus_4_6_australia_region_uses_au_prefix_not_apac():
+    """
+    Test that Australia region uses 'au.' prefix instead of incorrect 'apac.' prefix.
+
+    AWS Bedrock cross-region inference uses specific regional prefixes:
+    - 'us.' for United States
+    - 'eu.' for Europe
+    - 'au.' for Australia (ap-southeast-2)
+    - 'apac.' for Asia-Pacific (Singapore, ap-southeast-1)
+
+    This test ensures the Claude Opus 4.6 model correctly uses 'au.' for Australia,
+    and that 'apac.' is NOT incorrectly used for Australia region.
+
+    Related: The 'apac.' prefix is valid for Asia-Pacific (Singapore) region models,
+    but should not be used for Australia which has its own 'au.' prefix.
+    """
+    json_path = os.path.join(os.path.dirname(__file__), "../../model_prices_and_context_window.json")
+    with open(json_path) as f:
+        model_data = json.load(f)
+
+    # Verify au.anthropic.claude-opus-4-6-v1 exists (correct)
+    assert "au.anthropic.claude-opus-4-6-v1" in model_data, \
+        "Missing Australia region model: au.anthropic.claude-opus-4-6-v1"
+
+    # Verify apac.anthropic.claude-opus-4-6-v1 does NOT exist (incorrect)
+    assert "apac.anthropic.claude-opus-4-6-v1" not in model_data, \
+        "Incorrect model entry exists: apac.anthropic.claude-opus-4-6-v1 should be au.anthropic.claude-opus-4-6-v1"
+
+    # Verify the au. model is registered in bedrock_converse_models
+    assert "au.anthropic.claude-opus-4-6-v1" in litellm.bedrock_converse_models, \
+        "au.anthropic.claude-opus-4-6-v1 not registered in bedrock_converse_models"
+
+    # Verify apac. is NOT registered for this model
+    assert "apac.anthropic.claude-opus-4-6-v1" not in litellm.bedrock_converse_models, \
+        "apac.anthropic.claude-opus-4-6-v1 should not be in bedrock_converse_models"
+
+
 def test_opus_4_6_model_pricing_and_capabilities():
     json_path = os.path.join(os.path.dirname(__file__), "../../model_prices_and_context_window.json")
     with open(json_path) as f:
@@ -112,17 +149,7 @@ def test_opus_4_6_bedrock_regional_model_pricing():
             "cache_creation_input_token_cost_above_200k_tokens": 1.375e-05,
             "cache_read_input_token_cost_above_200k_tokens": 1.1e-06,
         },
-        "apac.anthropic.claude-opus-4-6-v1": {
-            "input_cost_per_token": 5.5e-06,
-            "output_cost_per_token": 2.75e-05,
-            "cache_creation_input_token_cost": 6.875e-06,
-            "cache_read_input_token_cost": 5.5e-07,
-            "input_cost_per_token_above_200k_tokens": 1.1e-05,
-            "output_cost_per_token_above_200k_tokens": 4.125e-05,
-            "cache_creation_input_token_cost_above_200k_tokens": 1.375e-05,
-            "cache_read_input_token_cost_above_200k_tokens": 1.1e-06,
-        },
-        "apac.anthropic.claude-opus-4-6-v1": {
+        "au.anthropic.claude-opus-4-6-v1": {
             "input_cost_per_token": 5.5e-06,
             "output_cost_per_token": 2.75e-05,
             "cache_creation_input_token_cost": 6.875e-06,
@@ -180,4 +207,4 @@ def test_opus_4_6_bedrock_converse_registration():
     assert "global.anthropic.claude-opus-4-6-v1" in litellm.bedrock_converse_models
     assert "us.anthropic.claude-opus-4-6-v1" in litellm.bedrock_converse_models
     assert "eu.anthropic.claude-opus-4-6-v1" in litellm.bedrock_converse_models
-    assert "apac.anthropic.claude-opus-4-6-v1" in litellm.bedrock_converse_models
+    assert "au.anthropic.claude-opus-4-6-v1" in litellm.bedrock_converse_models