Verified65% confidenceFactExact time
Starting from GPT-4, OpenAI introduced Function Calling (later renamed Tool Calling), where developers pass tool schemas to the model as JSON and the model returns structured invocation instructions.
3
Sources
65%
Confidence
Long-term
Relevance
7/12/2026
First Seen
Sources
Getting Started with LangGraph: Building AI Agent Workflows with Graph Structures
bilibili吴恩达LLM7/10/2026
Related Claims
UnverifiedOpenAI自GPT-4o起在API层面原生支持并行函数调用，允许模型在单次推理中返回多个同时执行的工具调用指令81% similarUnverifiedIn June 2023, OpenAI standardized tool-calling capabilities through the GPT-4 API for the first time, establishing a unified JSON Schema specification for tool calls, which Anthropic, Google, and others subsequently followed.79% similar
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