fix(utils): make prompt_token_calculator count claude models again

The claude branch called the anthropic SDK's `Anthropic().count_tokens`, which the
SDK removed, so every claude call raised AttributeError. Counting now goes through
litellm's own token_counter, which handles anthropic models offline and drops the
SDK dependency entirely.

Hiding that was a swallowed error: `except Exception: Exception("Anthropic import
failed please run `pip install anthropic`")` built the exception without raising
it, so an environment missing the SDK fell through to the unguarded
`from anthropic import ...` on the next line and got a bare ModuleNotFoundError
instead of the install hint.

That was the codebase's last PLW0133, so the rule graduates from the ratcheted
budget into ruff.toml where it hard-fails, and editors get the diagnostic inline.

litellm/utils.py

@@ -6526,21 +6526,10 @@ def acreate(*args, **kwargs):  ## Thin client to handle the acreate langchain ca
 
 
 def prompt_token_calculator(model, messages):
-    # use tiktoken or anthropic's tokenizer depending on the model
     text: Final = " ".join(message["content"] for message in messages)
-    num_tokens = 0
     if "claude" in model:
-        try:
-            import anthropic
-        except Exception:
-            Exception("Anthropic import failed please run `pip install anthropic`")
-        from anthropic import AI_PROMPT, HUMAN_PROMPT, Anthropic
-
-        anthropic_obj: Final = Anthropic()
-        num_tokens = anthropic_obj.count_tokens(text)
-    else:
-        num_tokens = len(_get_default_encoding().encode(text))
-    return num_tokens
+        return token_counter(model=model, text=text)
+    return len(_get_default_encoding().encode(text))
 
 
 def valid_model(model):

ruff-strict-budget.json

@@ -57,7 +57,7 @@
     "limit": 3
   },
   "BLE001": {
-    "limit": 2920
+    "limit": 2919
   },
   "C401": {
     "limit": 8
@@ -108,7 +108,7 @@
     "limit": 3
   },
   "F401": {
-    "limit": 17
+    "limit": 14
   },
   "LOG015": {
     "limit": 5
@@ -152,9 +152,6 @@
   "PLW0127": {
     "limit": 57
   },
-  "PLW0133": {
-    "limit": 1
-  },
   "PLW0602": {
     "limit": 215
   },

ruff.toml

@@ -5,9 +5,9 @@ lint.ignore = ["F405", "E402", "F403"]
 lint.extend-select = [
     "T20", "PGH004", "RUF008", "RUF009", "RUF100",
     "B033", "FURB136", "FURB168", "FURB188", "I001", "PERF402", "PIE790", "PIE800", "PLC0208",
-    "PLR0402", "PLR1711", "PLR1730", "PLR2044", "PYI030", "PYI041", "PYI064", "RET501", "RUF010",
-    "RUF022", "RUF023", "RUF051", "SIM114", "SIM118", "TC005", "UP006", "UP007", "UP008", "UP012",
-    "UP018", "UP024", "UP032", "UP034", "UP035", "UP037", "UP045",
+    "PLR0402", "PLR1711", "PLR1730", "PLR2044", "PLW0133", "PYI030", "PYI041", "PYI064", "RET501",
+    "RUF010", "RUF022", "RUF023", "RUF051", "SIM114", "SIM118", "TC005", "UP006", "UP007", "UP008",
+    "UP012", "UP018", "UP024", "UP032", "UP034", "UP035", "UP037", "UP045",
 ]
 # RUF100 (unused-noqa) only knows the rules enabled in THIS config, so it would strip
 # `# noqa` directives that protect rules enforced elsewhere. List those codes as external

tests/test_litellm/test_utils.py

@@ -1,6 +1,7 @@
 import json
 import logging
 import os
+import sys
 from typing import Final
 from unittest.mock import AsyncMock, MagicMock, patch
 
@@ -41,6 +42,7 @@ from litellm.utils import (
     get_prompt_cache_min_tokens,
     is_cached_message,
     is_prompt_caching_valid_prompt,
+    prompt_token_calculator,
 )
 
 # Adds the parent directory to the system path
@@ -4973,3 +4975,19 @@ def test_completion_does_not_leak_rust_flag_into_provider_request_body():
     create_kwargs = mock_client.chat.completions.with_raw_response.create.call_args.kwargs
     assert "rust" not in create_kwargs
     assert "rust" not in (create_kwargs.get("extra_body") or {})
+
+
+def test_prompt_token_calculator_counts_claude_without_the_anthropic_sdk():
+    """
+    The claude branch used to call the anthropic SDK's `count_tokens`, which the SDK
+    removed, so every claude call raised AttributeError. Counting must work with
+    `anthropic` unimportable.
+    """
+    messages: Final = [{"role": "user", "content": "the quick brown fox jumps over the lazy dog"}]
+
+    with patch.dict(sys.modules, {"anthropic": None}):
+        claude_tokens = prompt_token_calculator("claude-sonnet-4-5", messages)
+        gpt_tokens = prompt_token_calculator("gpt-4o", messages)
+
+    assert claude_tokens == 9
+    assert gpt_tokens == 9