[Bug]: The content output of the gemini 3 model is sent to the thinking part.

[LFSCODE]

What happened?

Input：
{
"model": "gemini-3-pro-preview",
"top_p": 0.9,
"stream": false,
"messages": [
{
"role": "user",
"content": "hello, introduce yourself"
}
],
"max_tokens": 5000,
"temperature": 0.9,
"reasoning_effort": "high"
}

Output：
{
"id": "T6QdadH-BaLnlOoP0vew8Qs",
"created": 1763550286,
"model": "gemini-3-pro-preview",
"object": "chat.completion",
"choices": [
{
"finish_reason": "stop",
"index": 0,
"message": {
"content": "Hello! I am Gemini, a large language model built by Google.\n\nI am designed to be a helpful and capable AI assistant. I can help you with a wide range of tasks, such as:\n\n* Answering questions: I can provide information on almost any topic.\n* Writing and creating: I can help draft emails, essays, stories, poems, and code.\n* Summarizing: I can condense long articles or documents into quick summaries.\n* Translating: I can translate text between many different languages.\n* Brainstorming: I can help generate ideas for projects or solve problems.\n\nHow can I help you today?",
"role": "assistant",
"images": [],
"thinking_blocks": [
{
"type": "thinking",
"thinking": "{"text": "Hello! I am Gemini, a large language model built by Google.\n\nI am designed to be a helpful and capable AI assistant. I can help you with a wide range of tasks, such as:\n\n* Answering questions: I can provide information on almost any topic.\n* Writing and creating: I can help draft emails, essays, stories, poems, and code.\n* Summarizing: I can condense long articles or documents into quick summaries.\n* Translating: I can translate text between many different languages.\n* Brainstorming: I can help generate ideas for projects or solve problems.\n\nHow can I help you today?"}",
"signature": "xxxxxx"
}
]
}
}
],
"usage": {
"completion_tokens": 957,
"prompt_tokens": 4,
"total_tokens": 961,
"completion_tokens_details": {
"reasoning_tokens": 815,
"text_tokens": 142
},
"prompt_tokens_details": {
"text_tokens": 4
}
},
"vertex_ai_grounding_metadata": [],
"vertex_ai_url_context_metadata": [],
"vertex_ai_safety_results": [],
"vertex_ai_citation_metadata": []
}

Relevant log output

Are you a ML Ops Team?

No

What LiteLLM version are you on ?

v1.75.5.rc.1

Twitter / LinkedIn details

No response