Fix auth issue

litellm/llms/azure/anthropic/transformation.py

@@ -1,11 +1,10 @@
 """
 Azure Anthropic transformation config - extends AnthropicConfig with Azure authentication
 """
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
+from typing import TYPE_CHECKING, Dict, List, Optional, Union
 
-import litellm
 from litellm.llms.anthropic.chat.transformation import AnthropicConfig
-from litellm.llms.azure.common_utils import BaseAzureLLM, get_azure_ad_token
+from litellm.llms.azure.common_utils import BaseAzureLLM
 from litellm.types.llms.openai import AllMessageValues
 from litellm.types.router import GenericLiteLLMParams
 
@@ -56,6 +55,11 @@ class AzureAnthropicConfig(AnthropicConfig):
         headers = BaseAzureLLM._base_validate_azure_environment(
             headers=headers, litellm_params=litellm_params_obj
         )
+        
+        # Azure Anthropic uses x-api-key header (not api-key)
+        # Convert api-key to x-api-key if present
+        if "api-key" in headers and "x-api-key" not in headers:
+            headers["x-api-key"] = headers.pop("api-key")
 
         # Get tools and other anthropic-specific setup
         tools = optional_params.get("tools")
@@ -81,10 +85,6 @@ class AzureAnthropicConfig(AnthropicConfig):
             user_anthropic_beta_headers=user_anthropic_beta_headers,
             mcp_server_used=mcp_server_used,
         )
-
-        # Remove x-api-key from anthropic headers since Azure uses different auth
-        anthropic_headers.pop("x-api-key", None)
-
         # Merge headers - Azure auth (api-key or Authorization) takes precedence
         headers = {**anthropic_headers, **headers}
 

litellm/main.py

@@ -2379,10 +2379,18 @@ def completion(  # type: ignore # noqa: PLR0915
                 )
 
             # Ensure the URL ends with /v1/messages
-            if not api_base.endswith("/v1/messages"):
-                if not api_base.endswith("/anthropic"):
-                    api_base = api_base.rstrip("/") + "/anthropic"
-                api_base = api_base.rstrip("/") + "/v1/messages"
+            api_base = api_base.rstrip("/")
+            if api_base.endswith("/v1/messages"):
+                pass
+            elif api_base.endswith("/anthropic/v1/messages"):
+                pass
+            else:
+                if "/anthropic" in api_base:
+                    parts = api_base.split("/anthropic", 1)
+                    api_base = parts[0] + "/anthropic"
+                else:
+                    api_base = api_base + "/anthropic"
+                api_base = api_base + "/v1/messages"
 
             response = azure_anthropic_chat_completions.completion(
                 model=model,

litellm/model_prices_and_context_window_backup.json

@@ -1087,6 +1087,60 @@
         "output_cost_per_token": 1.5e-05,
         "supports_function_calling": true
     },
+    "azure/claude-haiku-4-5": {
+        "input_cost_per_token": 1e-06,
+        "litellm_provider": "azure_anthropic",
+        "max_input_tokens": 200000,
+        "max_output_tokens": 64000,
+        "max_tokens": 64000,
+        "mode": "chat",
+        "output_cost_per_token": 5e-06,
+        "supports_assistant_prefill": true,
+        "supports_computer_use": true,
+        "supports_function_calling": true,
+        "supports_pdf_input": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_tool_choice": true,
+        "supports_vision": true
+    },
+    "azure/claude-opus-4-1": {
+        "input_cost_per_token": 1.5e-05,
+        "litellm_provider": "azure_anthropic",
+        "max_input_tokens": 200000,
+        "max_output_tokens": 32000,
+        "max_tokens": 32000,
+        "mode": "chat",
+        "output_cost_per_token": 7.5e-05,
+        "supports_assistant_prefill": true,
+        "supports_computer_use": true,
+        "supports_function_calling": true,
+        "supports_pdf_input": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_tool_choice": true,
+        "supports_vision": true
+    },
+    "azure/claude-sonnet-4-5": {
+        "input_cost_per_token": 3e-06,
+        "litellm_provider": "azure_anthropic",
+        "max_input_tokens": 200000,
+        "max_output_tokens": 64000,
+        "max_tokens": 64000,
+        "mode": "chat",
+        "output_cost_per_token": 1.5e-05,
+        "supports_assistant_prefill": true,
+        "supports_computer_use": true,
+        "supports_function_calling": true,
+        "supports_pdf_input": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_tool_choice": true,
+        "supports_vision": true
+    },
     "azure/computer-use-preview": {
         "input_cost_per_token": 3e-06,
         "litellm_provider": "azure",

model_prices_and_context_window.json

@@ -1087,6 +1087,60 @@
         "output_cost_per_token": 1.5e-05,
         "supports_function_calling": true
     },
+    "azure/claude-haiku-4-5": {
+        "input_cost_per_token": 1e-06,
+        "litellm_provider": "azure_anthropic",
+        "max_input_tokens": 200000,
+        "max_output_tokens": 64000,
+        "max_tokens": 64000,
+        "mode": "chat",
+        "output_cost_per_token": 5e-06,
+        "supports_assistant_prefill": true,
+        "supports_computer_use": true,
+        "supports_function_calling": true,
+        "supports_pdf_input": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_tool_choice": true,
+        "supports_vision": true
+    },
+    "azure/claude-opus-4-1": {
+        "input_cost_per_token": 1.5e-05,
+        "litellm_provider": "azure_anthropic",
+        "max_input_tokens": 200000,
+        "max_output_tokens": 32000,
+        "max_tokens": 32000,
+        "mode": "chat",
+        "output_cost_per_token": 7.5e-05,
+        "supports_assistant_prefill": true,
+        "supports_computer_use": true,
+        "supports_function_calling": true,
+        "supports_pdf_input": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_tool_choice": true,
+        "supports_vision": true
+    },
+    "azure/claude-sonnet-4-5": {
+        "input_cost_per_token": 3e-06,
+        "litellm_provider": "azure_anthropic",
+        "max_input_tokens": 200000,
+        "max_output_tokens": 64000,
+        "max_tokens": 64000,
+        "mode": "chat",
+        "output_cost_per_token": 1.5e-05,
+        "supports_assistant_prefill": true,
+        "supports_computer_use": true,
+        "supports_function_calling": true,
+        "supports_pdf_input": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_tool_choice": true,
+        "supports_vision": true
+    },
     "azure/computer-use-preview": {
         "input_cost_per_token": 3e-06,
         "litellm_provider": "azure",