diff --git a/dto/openai_request.go b/dto/openai_request.go
index 25ef3a21aa51..8c104ddd242d 100644
--- a/dto/openai_request.go
+++ b/dto/openai_request.go
@@ -279,8 +279,8 @@ type Message struct {
 	Content          any             `json:"content"`
 	Name             *string         `json:"name,omitempty"`
 	Prefix           *bool           `json:"prefix,omitempty"`
-	ReasoningContent string          `json:"reasoning_content,omitempty"`
-	Reasoning        string          `json:"reasoning,omitempty"`
+	ReasoningContent *string         `json:"reasoning_content,omitempty"`
+	Reasoning        *string         `json:"reasoning,omitempty"`
 	ToolCalls        json.RawMessage `json:"tool_calls,omitempty"`
 	ToolCallId       string          `json:"tool_call_id,omitempty"`
 	parsedContent    []MediaContent
@@ -431,6 +431,16 @@ const (
 	//ContentTypeAudioUrl   = "audio_url"
 )
 
+func (m *Message) GetReasoningContent() string {
+	if m.ReasoningContent == nil && m.Reasoning == nil {
+		return ""
+	}
+	if m.ReasoningContent != nil {
+		return *m.ReasoningContent
+	}
+	return *m.Reasoning
+}
+
 func (m *Message) GetPrefix() bool {
 	if m.Prefix == nil {
 		return false
diff --git a/relay/channel/claude/relay-claude.go b/relay/channel/claude/relay-claude.go
index fa8234523c77..e177e56dab14 100644
--- a/relay/channel/claude/relay-claude.go
+++ b/relay/channel/claude/relay-claude.go
@@ -567,12 +567,14 @@ func ResponseClaude2OpenAI(claudeResponse *dto.ClaudeResponse) *dto.OpenAITextRe
 	}
 	choice.SetStringContent(responseText)
 	if len(responseThinking) > 0 {
-		choice.ReasoningContent = responseThinking
+		choice.ReasoningContent = &responseThinking
 	}
 	if len(tools) > 0 {
 		choice.Message.SetToolCalls(tools)
 	}
-	choice.Message.ReasoningContent = thinkingContent
+	if thinkingContent != "" {
+		choice.Message.ReasoningContent = &thinkingContent
+	}
 	fullTextResponse.Model = claudeResponse.Model
 	choices = append(choices, choice)
 	fullTextResponse.Choices = choices
diff --git a/relay/channel/gemini/relay-gemini.go b/relay/channel/gemini/relay-gemini.go
index 21641e483861..355c75d71b7c 100644
--- a/relay/channel/gemini/relay-gemini.go
+++ b/relay/channel/gemini/relay-gemini.go
@@ -1097,7 +1097,7 @@ func responseGeminiChat2OpenAI(c *gin.Context, response *dto.GeminiChatResponse)
 						toolCalls = append(toolCalls, *call)
 					}
 				} else if part.Thought {
-					choice.Message.ReasoningContent = part.Text
+					choice.Message.ReasoningContent = &part.Text
 				} else {
 					if part.ExecutableCode != nil {
 						texts = append(texts, "```"+part.ExecutableCode.Language+"\n"+part.ExecutableCode.Code+"\n```")
diff --git a/relay/channel/ollama/stream.go b/relay/channel/ollama/stream.go
index 2a264b27e467..43e024deafd7 100644
--- a/relay/channel/ollama/stream.go
+++ b/relay/channel/ollama/stream.go
@@ -273,7 +273,7 @@ func ollamaChatHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.R
 
 	msg := dto.Message{Role: "assistant", Content: contentPtr(content)}
 	if rc := reasoningBuilder.String(); rc != "" {
-		msg.ReasoningContent = rc
+		msg.ReasoningContent = &rc
 	}
 	full := dto.OpenAITextResponse{
 		Id:      common.GetUUID(),
diff --git a/relay/channel/openai/relay-openai.go b/relay/channel/openai/relay-openai.go
index d33c5555f267..a85751844c0b 100644
--- a/relay/channel/openai/relay-openai.go
+++ b/relay/channel/openai/relay-openai.go
@@ -245,7 +245,7 @@ func OpenaiHandler(c *gin.Context, info *relaycommon.RelayInfo, resp *http.Respo
 		completionTokens := simpleResponse.Usage.CompletionTokens
 		if completionTokens == 0 {
 			for _, choice := range simpleResponse.Choices {
-				ctkm := service.CountTextToken(choice.Message.StringContent()+choice.Message.ReasoningContent+choice.Message.Reasoning, info.UpstreamModelName)
+				ctkm := service.CountTextToken(choice.Message.StringContent()+choice.Message.GetReasoningContent(), info.UpstreamModelName)
 				completionTokens += ctkm
 			}
 		}