---
type: email
from: Kazuhiro Sera <notifications@github.com>
subject: Re: [openai/openai-agents-python] Unusual CPU usage when running

 agents with "gpt-5-nano" (Issue #1409)
received: 2026-03-05 10:04:01
date_header: Wed, 13 Aug 2025 01:59:27 -0700
priority: normal
status: awaiting_approval
uid: 27426
---

## Email Content

**From:** Kazuhiro Sera <notifications@github.com>
**Subject:** Re: [openai/openai-agents-python] Unusual CPU usage when running

 agents with "gpt-5-nano" (Issue #1409)
**Date:** Wed, 13 Aug 2025 01:59:27 -0700

### Body (preview)

seratch left a comment (openai/openai-agents-python#1409)



Thanks for taking the time to report this. I've tried your code out, but as we're aware of, the behavior with gpt-5 model is different from gpt-4.1. Due to the behavioral difference, gpt-5 does not quickly complete the task like gpt-4.1 does.



The direct cause of the CPU usage seems to be your function tool, which performs web searches on your machine. I've switched to the built-in hosted web search tool, and the CPU issue does not occur. However, the root cause of this issue is gpt-5 model's misbehavior, so it does not mean you need to change your code at all.



Like I mentioned at #1397, we're aware of this gpt-5 model issue with Agents SDK. Until we resolve this, please continue using gpt-4.1 models.



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