Open Responses standard expands inference with agent loops — migrate from Chat Completion API

AI Impact Summary

Open Responses introduces an open, agent-centric inference standard that extends the Responses API to support raw reasoning streams, tool calls, and multi-provider routing. It formalizes three optional reasoning fields (content, encrypted_content, summary) and models streaming as semantic events, enabling richer observability and autonomous loops across providers. The changes affect client and router implementations by requiring Open Responses compatibility and adding loop controls like max_tool_calls and tool_choice, with active collaboration between OpenAI, Hugging Face, and various model providers (e.g., moonshotai and zai-org). Adoption will unlock more consistent agent workflows but requires migration from the legacy Chat Completion/Completion paths.