# Handle temperature/top_p settings
ONE_SAMPLER_PREFIXES = ("claude-sonnet-4-5", "claude-opus-4")
if api_model_name.startswith(ONE_SAMPLER_PREFIXES):
 if is_thinking_model:
 payload.pop("top_p", None)
 payload["temperature"] = 1.0
 elif self.valves.CLAUDE_45_USE_TEMPERATURE:
 payload.pop("top_p", None)
 payload["temperature"] = body.get("temperature", 0.8)
 else:
 payload.pop("temperature", None)
 payload["top_p"] = body.get("top_p", 0.9)
else:
 # Other Claude models support both
 payload["temperature"] = body.get("temperature", 0.8)
 payload["top_p"] = body.get("top_p", 0.9)

 def _is_claude_4x_model(self, model_name: str) -> bool:
 """
 Determine if a model is a Claude 4.x generation model that has temperature/top_p constraints.
 Uses a more future-proof approach than simple prefix matching.
 Args:
 model_name: The model name to check
 Returns:
 True if this is a Claude 4.x model with constraints
 """
 import re
 # Pattern to match Claude 4.x models with various version suffixes
 # Examples: claude-opus-4, claude-opus-4-1-20250805, claude-sonnet-4-5, claude-sonnet-4-5-20250929
 # The pattern allows for optional sub-versions (like -1, -5) and dates
 pattern = r"^claude-(opus|sonnet)-4(?:-\d+)?(?:-\d{8})?$"
 return bool(re.match(pattern, model_name))
 ```
 
 What do you think?