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OpenAI, Anthropic, xAI, and Google offer similar API-level tools for their LLMs, focusing on structured tool usage like function calling, web search, file handling, and code execution. While OpenAI provides built-in tools (web search, file search, code interpreter), Anthropic emphasizes client/server tool use distinctions, including editing and execution tools. xAI’s Grok prioritizes real-time web data integration. Google’s Gemini supports extensive custom integrations via function calling within Vertex AI.