Python: .Net: The Agent with ChatCompletion using GPT-5 on groupChat.InvokeStreamingAsync is not completing the tasks - abruptly stopping after few function calls.

[karthiksimplist]

The Agent with ChatCompletion using GPT-5 on groupChat.InvokeStreamingAsync is not completing the tasks - abruptly stopping after few function calls.

The same agent works fine when I just change it to other models like GPT-4.1.

With GPT-5 its consistently reproducible, My agent typically run a task which has to make few tool calls and gives a final response. In the case of GPT-5 it just stops after few tool calls and ends the stream without any errors.

I've verified for any possible termination, max turns, etc. - none of these caused this exit.

I am using Semantic Kernel .NET 1.62.0

[ai-votemate]

Confirming we have the same issue at VoteMate (votemate.io) using python semantic kernel and gpt-5-mini and invoke_stream

[crickman]

@moonbox3 - The customer here reached out and their issue is with Python. I'm doing a full pass using gpt-5 on the .NET side to verify our current level of support.

[ai-votemate]

Its working sometimes and not working sometimes, which is what end users experience too. Tool calls are all successful, attached log

app.log
test_stream_agent.py