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[Feature Request]: Make AG2 primary and fully supported with OpenAI Responses API

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--- # 📝 Migration: OpenAI Responses API ## Why migrate? > OpenAI’s Responses API is the new, recommended interface. It supersedes classic Chat Completions with built-in tools (web/file search, computer...

## Summary OpenAI has released **GPT ‑5**, their most advanced model series yet, with new variants and API features that will require significant updates in AG2 to support them effectively....