feat: add OutputOpenAIResponseReasoningItem to Output union

The Output discriminated union was missing a ReasoningItem variant,
causing type="reasoning" output items from the Responses API to
fall back to OutputOpenAIResponseMessageOutput with Pydantic warnings
and broken content access.

Adds OutputOpenAIResponseReasoningItem (with Content and Summary
subtypes) to both non-streaming and streaming response types.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: rranabha

src/llama_stack_client/types/response_object.py

@@ -40,6 +40,9 @@
     "OutputOpenAIResponseOutputMessageMcpListTools",
     "OutputOpenAIResponseOutputMessageMcpListToolsTool",
     "OutputOpenAIResponseMcpApprovalRequest",
+    "OutputOpenAIResponseReasoningItem",
+    "OutputOpenAIResponseReasoningItemContent",
+    "OutputOpenAIResponseReasoningItemSummary",
     "Error",
     "IncompleteDetails",
     "Prompt",
@@ -403,12 +406,49 @@ class OutputOpenAIResponseMcpApprovalRequest(BaseModel):
     type: Optional[Literal["mcp_approval_request"]] = None
 
 
+class OutputOpenAIResponseReasoningItemContent(BaseModel):
+    """Reasoning text content from the model's chain-of-thought."""
+
+    text: str
+
+    type: Optional[Literal["reasoning_text"]] = None
+
+
+class OutputOpenAIResponseReasoningItemSummary(BaseModel):
+    """Summary of the model's reasoning output."""
+
+    text: str
+
+    type: Optional[Literal["summary_text"]] = None
+
+
+class OutputOpenAIResponseReasoningItem(BaseModel):
+    """Reasoning output item for OpenAI responses.
+
+    Contains the model's chain-of-thought reasoning, either as raw content
+    (open-source models) or as a summary (closed-source models).
+    """
+
+    id: str
+
+    summary: List[OutputOpenAIResponseReasoningItemSummary]
+
+    content: Optional[List[OutputOpenAIResponseReasoningItemContent]] = None
+
+    encrypted_content: Optional[str] = None
+
+    status: Optional[Literal["in_progress", "completed", "incomplete"]] = None
+
+    type: Optional[Literal["reasoning"]] = None
+
+
 Output: TypeAlias = Annotated[
     Union[
         OutputOpenAIResponseMessageOutput,
         OutputOpenAIResponseOutputMessageWebSearchToolCall,
         OutputOpenAIResponseOutputMessageFileSearchToolCall,
         OutputOpenAIResponseOutputMessageFunctionToolCall,
+        OutputOpenAIResponseReasoningItem,
         OutputOpenAIResponseOutputMessageMcpCall,
         OutputOpenAIResponseOutputMessageMcpListTools,
         OutputOpenAIResponseMcpApprovalRequest,

src/llama_stack_client/types/response_object_stream.py

@@ -42,6 +42,9 @@
     "OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseOutputMessageMcpListTools",
     "OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseOutputMessageMcpListToolsTool",
     "OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseMcpApprovalRequest",
+    "OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItem",
+    "OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItemContent",
+    "OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItemSummary",
     "OpenAIResponseObjectStreamResponseOutputItemDone",
     "OpenAIResponseObjectStreamResponseOutputItemDoneItem",
     "OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseMessage",
@@ -67,6 +70,9 @@
     "OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseOutputMessageMcpListTools",
     "OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseOutputMessageMcpListToolsTool",
     "OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseMcpApprovalRequest",
+    "OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItem",
+    "OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItemContent",
+    "OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItemSummary",
     "OpenAIResponseObjectStreamResponseOutputTextDelta",
     "OpenAIResponseObjectStreamResponseOutputTextDeltaLogprob",
     "OpenAIResponseObjectStreamResponseOutputTextDeltaLogprobTopLogprob",
@@ -491,12 +497,45 @@ class OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseMcpAppr
     type: Optional[Literal["mcp_approval_request"]] = None
 
 
+class OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItemContent(BaseModel):
+    """Reasoning text content from the model's chain-of-thought."""
+
+    text: str
+
+    type: Optional[Literal["reasoning_text"]] = None
+
+
+class OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItemSummary(BaseModel):
+    """Summary of the model's reasoning output."""
+
+    text: str
+
+    type: Optional[Literal["summary_text"]] = None
+
+
+class OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItem(BaseModel):
+    """Reasoning output item for OpenAI responses."""
+
+    id: str
+
+    summary: List[OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItemSummary]
+
+    content: Optional[List[OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItemContent]] = None
+
+    encrypted_content: Optional[str] = None
+
+    status: Optional[str] = None
+
+    type: Optional[Literal["reasoning"]] = None
+
+
 OpenAIResponseObjectStreamResponseOutputItemAddedItem: TypeAlias = Annotated[
     Union[
         OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseMessage,
         OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseOutputMessageWebSearchToolCall,
         OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseOutputMessageFileSearchToolCall,
         OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseOutputMessageFunctionToolCall,
+        OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseReasoningItem,
         OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseOutputMessageMcpCall,
         OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseOutputMessageMcpListTools,
         OpenAIResponseObjectStreamResponseOutputItemAddedItemOpenAIResponseMcpApprovalRequest,
@@ -860,12 +899,45 @@ class OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseMcpAppro
     type: Optional[Literal["mcp_approval_request"]] = None
 
 
+class OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItemContent(BaseModel):
+    """Reasoning text content from the model's chain-of-thought."""
+
+    text: str
+
+    type: Optional[Literal["reasoning_text"]] = None
+
+
+class OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItemSummary(BaseModel):
+    """Summary of the model's reasoning output."""
+
+    text: str
+
+    type: Optional[Literal["summary_text"]] = None
+
+
+class OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItem(BaseModel):
+    """Reasoning output item for OpenAI responses."""
+
+    id: str
+
+    summary: List[OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItemSummary]
+
+    content: Optional[List[OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItemContent]] = None
+
+    encrypted_content: Optional[str] = None
+
+    status: Optional[str] = None
+
+    type: Optional[Literal["reasoning"]] = None
+
+
 OpenAIResponseObjectStreamResponseOutputItemDoneItem: TypeAlias = Annotated[
     Union[
         OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseMessage,
         OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseOutputMessageWebSearchToolCall,
         OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseOutputMessageFileSearchToolCall,
         OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseOutputMessageFunctionToolCall,
+        OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseReasoningItem,
         OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseOutputMessageMcpCall,
         OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseOutputMessageMcpListTools,
         OpenAIResponseObjectStreamResponseOutputItemDoneItemOpenAIResponseMcpApprovalRequest,