I am using GPT-4o for my tool calling agent and tool calling response is very inconsistent. Sometime, after a tool call, finish_reason=‘stop’ which is wrong as it should be ‘tool_calls’ and sometime it gives me correct finish_reason=‘tool_calls’. I read the docs but I am not sure if I am missing som…

Welcome to the dev forum @hasnain.khan Are you using tool_choice param?

Existing Topic: [image] Function call with finish_reason of stop Feedback We are receiving some responses from the api with finish_reason of “stop” when the model is calling a function. Has anyone else experienced this? [image]

I tried both with and without tool_choice='auto' but in both case, response is consistent.

[image] hasnain.khan: in both case, response is consistent Can you confirm the exact finish reason?

In case of tool calling, sometime finish reason is stop and sometime finish reason is tool_calls.

I did some testing on my end and was unable to reproduce the issue. If you have the code and chat completion request IDs please share them here. [image] Function call with finish_reason of stop Feedback play_button I just ran this code to test if there have b…

OpenAI tool calling returns inconsistent response

API

merefield February 15, 2025, 9:37am 3

Existing Topic:

Topic		Replies	Views
Function call with finish_reason of stop Feedback	49	11849	July 7, 2025
Finish_reason: stop but have a tool_calls and no content API chatgpt , api	0	1517	June 14, 2024
Force a model to continue function calls after finish_reason tool_calls API api	0	369	September 11, 2024
Strange Agent Behaviour With Tool Calling September 4 2024 Bugs gpt4o	4	1205	September 5, 2024
GPT-4.1 sometimes says “One moment…” / “Hang tight…” but never calls a tool Bugs gpt-4 , api , function-calling , tools , gpt-41	6	648	August 31, 2025

OpenAI tool calling returns inconsistent response

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