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Fix DeepSeek multi-turn chat breaking with reasoning_content error #3476

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Fix DeepSeek multi-turn chat breaking with reasoning_content error #3476

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4172584
Fix DeepSeek multi-turn failure by preserving reasoning_content
0x5t4l1n Aug 17, 2026
82e42e9
preserve reasoning_content in partial message on client disconnect
0x5t4l1n Aug 27, 2026
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18 changes: 12 additions & 6 deletions pkg/aiusechat/openaichat/openaichat-backend.go
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,7 @@ func processChatStream(
) (*uctypes.WaveStopReason, *StoredChatMessage, error) {
decoder := eventsource.NewDecoder(body)
var textBuilder strings.Builder
var reasoningBuilder strings.Builder
msgID := uuid.New().String()
textID := uuid.New().String()
var finishReason string
Expand Down Expand Up @@ -128,7 +129,7 @@ func processChatStream(
break
}
if sseHandler.Err() != nil {
partialMsg := extractPartialTextMessage(msgID, textBuilder.String())
partialMsg := extractPartialTextMessage(msgID, textBuilder.String(), reasoningBuilder.String())
return &uctypes.WaveStopReason{
Kind: uctypes.StopKindCanceled,
ErrorType: "client_disconnect",
Expand Down Expand Up @@ -159,6 +160,9 @@ func processChatStream(
}

choice := chunk.Choices[0]
if choice.Delta.ReasoningContent != "" {
reasoningBuilder.WriteString(choice.Delta.ReasoningContent)
}
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if choice.Delta.Content != "" {
if !textStarted {
_ = sseHandler.AiMsgTextStart(textID)
Expand Down Expand Up @@ -239,7 +243,8 @@ func processChatStream(
assistantMsg := &StoredChatMessage{
MessageId: msgID,
Message: ChatRequestMessage{
Role: "assistant",
Role: "assistant",
ReasoningContent: reasoningBuilder.String(),
},
}

Expand All @@ -260,16 +265,17 @@ func processChatStream(
return stopReason, assistantMsg, nil
}

func extractPartialTextMessage(msgID string, text string) *StoredChatMessage {
if text == "" {
func extractPartialTextMessage(msgID string, text string, reasoning string) *StoredChatMessage {
if text == "" && reasoning == "" {
return nil
}

return &StoredChatMessage{
MessageId: msgID,
Message: ChatRequestMessage{
Role: "assistant",
Content: text,
Role: "assistant",
Content: text,
ReasoningContent: reasoning,
},
}
}
41 changes: 23 additions & 18 deletions pkg/aiusechat/openaichat/openaichat-types.go
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Original file line number Diff line number Diff line change
Expand Up @@ -50,29 +50,32 @@ type ChatImageUrl struct {
}

type ChatRequestMessage struct {
Role string `json:"role"` // "system","user","assistant","tool"
Content string `json:"-"` // plain text (used when ContentParts is nil)
ContentParts []ChatContentPart `json:"-"` // multimodal parts (used when images present)
ToolCalls []ToolCall `json:"tool_calls,omitempty"` // assistant tool-call message
ToolCallID string `json:"tool_call_id,omitempty"` // for role:"tool"
Name string `json:"name,omitempty"` // tool name on role:"tool"
Role string `json:"role"` // "system","user","assistant","tool"
Content string `json:"-"` // plain text (used when ContentParts is nil)
ContentParts []ChatContentPart `json:"-"` // multimodal parts (used when images present)
ReasoningContent string `json:"-"` // preserved for DeepSeek multi-turn (reasoning_content)
ToolCalls []ToolCall `json:"tool_calls,omitempty"` // assistant tool-call message
ToolCallID string `json:"tool_call_id,omitempty"` // for role:"tool"
Name string `json:"name,omitempty"` // tool name on role:"tool"
}

// chatRequestMessageJSON is the wire format for ChatRequestMessage
type chatRequestMessageJSON struct {
Role string `json:"role"`
Content json.RawMessage `json:"content"`
ToolCalls []ToolCall `json:"tool_calls,omitempty"`
ToolCallID string `json:"tool_call_id,omitempty"`
Name string `json:"name,omitempty"`
Role string `json:"role"`
Content json.RawMessage `json:"content"`
ReasoningContent string `json:"reasoning_content,omitempty"`
ToolCalls []ToolCall `json:"tool_calls,omitempty"`
ToolCallID string `json:"tool_call_id,omitempty"`
Name string `json:"name,omitempty"`
}

func (cm ChatRequestMessage) MarshalJSON() ([]byte, error) {
raw := chatRequestMessageJSON{
Role: cm.Role,
ToolCalls: cm.ToolCalls,
ToolCallID: cm.ToolCallID,
Name: cm.Name,
Role: cm.Role,
ReasoningContent: cm.ReasoningContent,
ToolCalls: cm.ToolCalls,
ToolCallID: cm.ToolCallID,
Name: cm.Name,
}
if len(cm.ContentParts) > 0 {
b, err := json.Marshal(cm.ContentParts)
Expand All @@ -96,6 +99,7 @@ func (cm *ChatRequestMessage) UnmarshalJSON(data []byte) error {
return err
}
cm.Role = raw.Role
cm.ReasoningContent = raw.ReasoningContent
cm.ToolCalls = raw.ToolCalls
cm.ToolCallID = raw.ToolCallID
cm.Name = raw.Name
Expand Down Expand Up @@ -193,9 +197,10 @@ type StreamChoice struct {

// This is the important part:
type ContentDelta struct {
Role string `json:"role,omitempty"`
Content string `json:"content,omitempty"`
ToolCalls []ToolCallDelta `json:"tool_calls,omitempty"`
Role string `json:"role,omitempty"`
Content string `json:"content,omitempty"`
ReasoningContent string `json:"reasoning_content,omitempty"`
ToolCalls []ToolCallDelta `json:"tool_calls,omitempty"`
}

type ToolCallDelta struct {
Expand Down