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Inconcistency between Responses API and Chat Completions API on rate limit errors

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
55/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
python

调研方向

从 responses.create(..., stream=True) 入口开始,将其 rate-limit 错误处理与 Chat Completions 的流式处理路径进行比较,尤其关注迭代之前的客户端重试逻辑。使用较长的输入在 Azure 托管的模型上重现,然后确定并测试在创建流以及读取流时引发的错误应具有一致的行为。

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描述

bug
Confirm this is an issue with the Python library and not an underlying OpenAI API
  • This is an issue with the Python library
Describe the bug

I noticed that rate limit errors are raised differently in the two APIs during streaming. In chat completions the error is raised and retried by the client itself on the initial call, before reading the stream. On the other hand, the first call to responses.create(...) returns a stream object successfully and then upon reading the stream, an APIError is raised indicating a rate limit. As a result, the whole retrying logic in the client is completely skipped and the user has to implement their own. It is also unclear whether an error could be raised mid-stream which adds to the complexity of the fix.

After inspecting the client's code, I initially thought that this is not a library issue but a misalignment with the model's service. I contacted Microsoft support since they host our models but they insisted I raise an issue here.

To Reproduce

To reproduce this you would need an Azure hosted OpenAI model ( I have personally already tried this with gpt-4o and gpt-5 ). Lower your token rate limit threshold to a low enough value and use the below snippet.

Code snippets
from openai import OpenAI

client = OpenAI(  
  base_url = "your-endpoint-v1",
  api_key="your-api-key"
)

response = client.responses.create(
    model="your-model",
    store=False,
    stream=True,
    input='a long enough prompt'*10000 # to hit a rate limit
)

for event in response:
   continue # an APIError is raised here
OS

Linux, Windows

Python version

Python >=3.11.9

Library version

openai v1.109.1

主要语言
Python
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