Apply web search citation stripping for GPT-5.x models in OpenAI conversation

[frenck]

Proposed change

When using GPT-5.x models with web_search enabled and inline_citations disabled, citations like ([legaseriea.it](https://...)) were still included in responses.

The regex-based citation stripping was guarded by "reasoning" not in model_args, which excluded all reasoning models. However, only o-series models (o1, o3, etc.) natively respect the prompt instruction to omit citations. GPT-5.x models do not, so they need the regex fallback.

This changes the guard to not model_args["model"].startswith("o") so that citation stripping is applied to all non-o-series models, including GPT-5.x.

Type of change

• Dependency upgrade
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• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes OpenAI web search: citation stripping not applied to GPT-5.x models #170566
• This PR is related to issue:
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[home-assistant]

Hey there @Shulyaka, mind taking a look at this pull request as it has been labeled with an integration (openai_conversation) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

Fixes OpenAI Conversation web search responses incorrectly including Markdown inline citations for GPT‑5.x models when inline_citations is disabled, by applying the regex citation-stripping fallback to all non‑o‑series models.

Changes:

• Change the citation-stripping guard from “not a reasoning model” to “not an o‑series model” so GPT‑5.x gets the regex fallback.
• Add a regression test ensuring citations are stripped for GPT‑5 models when web_search is enabled and inline_citations is disabled.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
homeassistant/components/openai_conversation/entity.py	Applies citation stripping for web search to all non‑o‑series models (including GPT‑5.x).
tests/components/openai_conversation/test_conversation.py	Adds test coverage to validate citation stripping behavior for GPT‑5 models.

[Shulyaka]

Let me check if we can do this with a better prompt