diff --git a/internal/translator/claude/gemini/claude_gemini_request.go b/internal/translator/claude/gemini/claude_gemini_request.go
index 4ca3f4a7..1f25117a 100644
--- a/internal/translator/claude/gemini/claude_gemini_request.go
+++ b/internal/translator/claude/gemini/claude_gemini_request.go
@@ -98,7 +98,9 @@ func ConvertGeminiRequestToClaude(modelName string, inputRawJSON []byte, stream
 		// Temperature setting for controlling response randomness
 		if temp := genConfig.Get("temperature"); temp.Exists() {
 			out, _ = sjson.Set(out, "temperature", temp.Float())
-		} else if topP := genConfig.Get("topP"); topP.Exists() {
+		}
+		// Top P setting for nucleus sampling (filtered out if temperature is set)
+		if topP := genConfig.Get("topP"); topP.Exists() && !genConfig.Get("temperature").Exists() {
 			out, _ = sjson.Set(out, "top_p", topP.Float())
 		}
 		// Stop sequences configuration for custom termination conditions
diff --git a/internal/translator/claude/openai/chat-completions/claude_openai_request.go b/internal/translator/claude/openai/chat-completions/claude_openai_request.go
index 526593c6..5b71ce70 100644
--- a/internal/translator/claude/openai/chat-completions/claude_openai_request.go
+++ b/internal/translator/claude/openai/chat-completions/claude_openai_request.go
@@ -110,7 +110,10 @@ func ConvertOpenAIRequestToClaude(modelName string, inputRawJSON []byte, stream
 	// Temperature setting for controlling response randomness
 	if temp := root.Get("temperature"); temp.Exists() {
 		out, _ = sjson.Set(out, "temperature", temp.Float())
-	} else if topP := root.Get("top_p"); topP.Exists() {
+	}
+
+	// Top P setting for nucleus sampling (filtered out if temperature is set)
+	if topP := root.Get("top_p"); topP.Exists() && !root.Get("temperature").Exists() {
 		out, _ = sjson.Set(out, "top_p", topP.Float())
 	}