Logprops feature is not consistently working

[moej100]

Summary

Cannot generate log probabilities from models above 2.0. Even for 2.0 sometimes it works and sometimes not. I receive the error
ClientError: 400 INVALID_ARGUMENT. {'error': {'code': 400, 'message': 'Logprobs is not enabled for models/gemini-2.5-pro', 'status': 'INVALID_ARGUMENT'}}

Environment details

• Programming language: Pyhon
• OS: macOS
• Language runtime version: 3.12.11
• Package version: 1.56.0

Steps to reproduce

Here is the code I used. Only works when I change model name to gemini-2.0-flash

from google import genai
from google.genai.types import GenerateContentConfig


client = genai.Client()
MODEL_ID = "gemini-2.5-flash"
prompt = "I really like the new features of the latest smartphone release."
response_schema = {"type": "STRING", "enum": ["Positive", "Negative", "Neutral"]}

response = client.models.generate_content(
    model=MODEL_ID,
    contents=prompt,
    config=GenerateContentConfig(
        response_mime_type="text/x.enum",              
        response_schema=response_schema,
        response_logprobs=True,
        logprobs=3,
    ),
)

Thanks!

[janasangeetha]

Hey @moej100
Thank you for bringing this to our attention. We truly appreciate you flagging this issue, we will file a bug internally.