[I] [Tech Debt] Update stale OpenAI default model gpt-3.5-turbo to gpt-4o-mini [flink-agents]

["weiqingy (via GitHub)" <gi...@apache.org>]

weiqingy opened a new issue, #905:
URL: https://github.com/apache/flink-agents/issues/905

   ### Search before asking
   
   - [X] I searched in the [issues](https://github.com/apache/flink-agents/issues) and found nothing similar.
   
   ### Description
   
   The OpenAI Chat Completions chat model defaults to `gpt-3.5-turbo` when the caller omits `model`. This is a legacy OpenAI model — it has been superseded by cheaper, more capable small models, and OpenAI itself steers new integrations away from it. A user who takes the default today silently gets an outdated model.
   
   The stale default lives in both language runtimes and the docs, so a user hits it regardless of which API they use:
   
   - Java — `OpenAICompletionsSetup.DEFAULT_MODEL` (`integrations/chat-models/openai/src/main/java/org/apache/flink/agents/integrations/chatmodels/openai/OpenAICompletionsSetup.java:61`)
   - Python — `DEFAULT_OPENAI_MODEL` (`python/flink_agents/integrations/chat_models/openai/openai_chat_model.py:38`)
   - Docs — the `OpenAICompletionsSetup` parameter tables for both languages (`docs/content/docs/development/chat_models.md`)
   
   The Java Javadoc example already uses `gpt-4o-mini` (`OpenAICompletionsSetup.java:45`), so the code base is already inconsistent with its own default.
   
   Proposed fix: update the default in both runtimes and the docs to `gpt-4o-mini` — the current low-cost successor to `gpt-3.5-turbo`, and the value the Javadoc example already demonstrates. This keeps a sensible zero-config default while dropping the legacy model, and it keeps Java and Python in parity.
   
   ### Are you willing to submit a PR?
   
   - [X] I'm willing to submit a PR!
   


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Re: [I] [Tech Debt] Update stale OpenAI default model gpt-3.5-turbo to gpt-4o-mini [flink-agents]

["wenjin272 (via GitHub)" <gi...@apache.org>]

wenjin272 closed issue #905: [Tech Debt] Update stale OpenAI default model gpt-3.5-turbo to gpt-4o-mini
URL: https://github.com/apache/flink-agents/issues/905


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