[Test] Anthropic: Replace Legacy Claude-4-Sonnet Alias With Haiku 4.5

Three live-API tests pinned to claude-4-sonnet-20250514, which is a
non-canonical alias of claude-sonnet-4-20250514. Anthropic's main API
no longer resolves the legacy form under freshly issued keys, so the
tests fail with not_found_error. The token counter test pinned to
claude-sonnet-4-20250514 itself (deprecation_date 2026-05-14, two weeks
out) was on borrowed time too.

Bump all four to claude-haiku-4-5-20251001 — capability superset for what
these tests exercise (streaming, parallel tool calling, extended thinking,
token counting), no upcoming deprecation, cheaper per-token.

tests/litellm_utils_tests/test_anthropic_token_counter.py

@@ -26,7 +26,7 @@ class TestAnthropicTokenCounter(BaseTokenCounterTest):
         return AnthropicTokenCounter()
 
     def get_test_model(self) -> str:
-        return "claude-sonnet-4-20250514"
+        return "claude-haiku-4-5-20251001"
 
     def get_test_messages(self) -> List[Dict[str, Any]]:
         return [{"role": "user", "content": "Hello, how are you today?"}]

tests/local_testing/test_function_calling.py

@@ -158,7 +158,7 @@ def test_aaparallel_function_call(model):
 @pytest.mark.parametrize(
     "model",
     [
-        "anthropic/claude-4-sonnet-20250514",
+        "anthropic/claude-haiku-4-5-20251001",
         "bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0",
     ],
 )

tests/local_testing/test_streaming.py

@@ -1270,7 +1270,7 @@ def test_bedrock_claude_3_streaming():
 @pytest.mark.parametrize(
     "model",
     [
-        "claude-4-sonnet-20250514",
+        "claude-haiku-4-5-20251001",
         "cohere.command-r-plus-v1:0",  # bedrock
         "gpt-3.5-turbo",
     ],
@@ -2696,7 +2696,7 @@ def test_completion_claude_3_function_call_with_streaming():
     try:
         # test without max tokens
         response = completion(
-            model="claude-4-sonnet-20250514",
+            model="claude-haiku-4-5-20251001",
             messages=messages,
             tools=tools,
             tool_choice="required",