diff --git a/backend/services/ai_provider.go b/backend/services/ai_provider.go
index c360eb9..09c4deb 100644
--- a/backend/services/ai_provider.go
+++ b/backend/services/ai_provider.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"log"
 	"lokistack/repository"
 	"net/http"
 	"strings"
@@ -35,7 +36,8 @@ type aiChatRequest struct {
 type aiChatResponse struct {
 	Choices []struct {
 		Message struct {
-			Content string `json:"content"`
+			Content          string `json:"content"`
+			ReasoningContent string `json:"reasoning_content"`
 		} `json:"message"`
 		FinishReason string `json:"finish_reason"`
 	} `json:"choices"`
@@ -97,6 +99,7 @@ func aiChat(ctx context.Context, cfg models.AIConfig, messages []aiMessage) (str
 	defer resp.Body.Close()
 
 	raw, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	log.Printf("[ai-chat] url=%s model=%s keyLen=%d status=%d body=%.300s", url, cfg.Model, len(cfg.APIKey), resp.StatusCode, string(raw))
 	if resp.StatusCode >= 400 {
 		var parsed aiChatResponse
 		if json.Unmarshal(raw, &parsed) == nil && parsed.Error != nil && parsed.Error.Message != "" {
@@ -112,7 +115,13 @@ func aiChat(ctx context.Context, cfg models.AIConfig, messages []aiMessage) (str
 	if len(parsed.Choices) == 0 {
 		return "", 0, 0, fmt.Errorf("模型没有返回任何内容（finish_reason 为空）")
 	}
-	return parsed.Choices[0].Message.Content, parsed.Usage.PromptTokens, parsed.Usage.CompletionTokens, nil
+	content := parsed.Choices[0].Message.Content
+	// DeepSeek 推理系模型(deepseek-reasoner / v4-pro 高推理档)会把过程写在
+	// reasoning_content,最终 content 在 MaxTokens 太小时可能为空 —— 回退使用推理内容
+	if strings.TrimSpace(content) == "" {
+		content = parsed.Choices[0].Message.ReasoningContent
+	}
+	return content, parsed.Usage.PromptTokens, parsed.Usage.CompletionTokens, nil
 }
 
 // AIConnectionTest 连通性测试结果:面向展示的结构化信息,不外发原始回复