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Implements native support for OpenAI's Responses API (/v1/responses) as a new LLM provider in CrewAI. This addresses feature request #4152. Key features: - New OpenAIResponsesCompletion class extending BaseLLM - Support for both explicit provider parameter and model prefix routing - Message conversion from CrewAI format to Responses API format - Tool/function calling support - Streaming support (sync and async) - Structured output via Pydantic models - Token usage tracking - Support for o-series reasoning models with reasoning_effort parameter - Support for stateful conversations via previous_response_id Usage: # Option 1: Using provider parameter llm = LLM(model='gpt-4o', provider='openai_responses') # Option 2: Using model prefix llm = LLM(model='openai_responses/gpt-4o') Includes comprehensive test coverage for: - Provider routing - Message conversion - Tool conversion - API calls - Parameter preparation - Context window sizes - Feature support methods - Token usage extraction Co-Authored-By: João <joao@crewai.com>