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fix: strip <think> tokens from reasoning model output #617

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fix: strip <think> tokens from reasoning model output #617

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18 changes: 16 additions & 2 deletions runtime/node/agent/providers/openai_provider.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

import base64
import hashlib
import re

import binascii
import os
Expand Down Expand Up @@ -383,18 +384,31 @@ def _deserialize_chat_response(self, response: Any) -> Message:
type="function"
))

content = self._get_attr(msg, "content") or ""
content = self._strip_thinking_tokens(content)

return Message(
role=MessageRole.ASSISTANT,
content=self._get_attr(msg, "content") or "",
content=content,
tool_calls=tool_calls
)

_THINK_PATTERN = re.compile(r"<think>.*?</think>\s*", re.DOTALL)

@classmethod
def _strip_thinking_tokens(cls, text: str) -> str:
"""Strip <think>...</think> blocks from model output (e.g. DeepSeek-R1, MiniMax-M2.7)."""
if "<think>" not in text:
return text
return cls._THINK_PATTERN.sub("", text).strip()

def _append_chat_response_output(self, timeline: List[Any], response: Any) -> None:
"""Add chat response to timeline, preserving tool_calls (Chat API compatible)."""
msg = response.choices[0].message
content = self._strip_thinking_tokens(msg.content or "")
assistant_msg = {
"role": "assistant",
"content": msg.content or ""
"content": content
}

if getattr(msg, "tool_calls", None):
Expand Down