pipecat/changelog/4141.added.md

• ⚠️ Added WebSocket-based OpenAIResponsesLLMService as the new default for the OpenAI Responses API. It maintains a persistent connection to wss://api.openai.com/v1/responses and automatically uses previous_response_id to send only incremental context, falling back to full context on reconnection or cache miss. The previous HTTP-based implementation is now available as OpenAIResponsesHttpLLMService.