Preformatted text Invalid operation: The response.text quick accessor requires the response to contain a valid Part, but none were returned. The candidate’s finish_reason is 2

Gemini API
,
1

Hello developer,
Could you please tell me why I’m getting an error? I didn’t ask for any information that violates policies.
I am using the Gemini 2.5 Flash model.

Preformatted text Invalid operation: The response.text quick accessor requires the response to contain a valid Part , but none were returned. The candidate’s finish_reason is 2.

3

In your case, the finish_reason is 2, which corresponds to MAX_TOKENS. This indicates that the model stopped generating content because it reached the maximum token limit specified in your request.

To handle this situation gracefully, you can check the finish_reason before attempting to access response.text.

4

Thank you for your reply. I have already resolved the issue.

6

May I ask whether the thinking process of 2.5flash is also counted as output tokens?

8

In the context of API usage or token limits, the model’s response—whether it’s intermediate or final—is typically counted as output tokens.