diff --git a/src/pygpt_net/provider/api/anthropic/chat.py b/src/pygpt_net/provider/api/anthropic/chat.py
index 66e7cd549..8ed0f5e5d 100644
--- a/src/pygpt_net/provider/api/anthropic/chat.py
+++ b/src/pygpt_net/provider/api/anthropic/chat.py
@@ -102,10 +102,11 @@ def send(self, context: BridgeContext, extra: Optional[Dict[str, Any]] = None):
         # Add optional fields only if provided
         if system_prompt:
             params["system"] = system_prompt  # SDK expects string or blocks, not None
-        if temperature is not None:
-            params["temperature"] = temperature  # keep as-is; upstream config controls the type
-        if top_p is not None:
-            params["top_p"] = top_p
+        # Claude 4.x: top_p is rejected when temperature is also present.
+        # Opus 4.x and claude-3-7-sonnet have deprecated temperature entirely (extended thinking).
+        _no_temp = ("claude-opus-4-", "claude-3-7-sonnet")
+        if temperature is not None and not any(model.id.startswith(p) for p in _no_temp):
+            params["temperature"] = temperature
         if tools:  # only include when non-empty list
             params["tools"] = tools  # must be a valid list per API
         if mcp_servers: