Verified70% confidenceFactExact time
Tool-calling capabilities were first formally introduced by OpenAI in June 2023 in the GPT-4 API, after which mainstream models including Claude and Gemini successively followed suit
4
Sources
70%
Confidence
Long-term
Relevance
7/7/2026
First Seen
Sources
Spring AI 2.0实战：Java开发者构建Agent智能体入门指南
bilibiliAI大模型面试官7/6/2026
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