Build agentic AI applications with OpenAI's Responses API - the stateful successor to Chat Completions. Preserves reasoning across turns for 5% better multi-turn performance and 40-80% improved cache utilization. Use when: building AI agents with persistent reasoning, integrating MCP servers for external tools, using built-in Code Interpreter/File Search/Web Search, managing stateful conversations, implementing background processing for long tasks, or migrating from Chat Completions to gain polymorphic outputs and server-side tools.
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README.mdreferences/built-in-tools-guide.mdreferences/mcp-integration-guide.mdreferences/migration-guide.mdreferences/reasoning-preservation.mdreferences/responses-vs-chat-completions.mdreferences/stateful-conversations.mdreferences/top-errors.mdrules/openai-responses.mdscripts/check-versions.shtemplates/background-mode.tstemplates/basic-response.tstemplates/cloudflare-worker.tstemplates/code-interpreter.tstemplates/file-search.tstemplates/image-generation.tstemplates/mcp-integration.tstemplates/package.jsontemplates/stateful-conversation.tstemplates/web-search.ts