Verified80% confidenceFactExact time
The Function Calling capability was first formally introduced by OpenAI in June 2023 within the GPT-3.5/4 API.
88
Sources
80%
Confidence
Long-term
Relevance
5/27/2026
First Seen
Sources
Why Qwen3 Is the Best Open-Source Model for MCP Agent Development
bilibili大模型姗姗5/27/2026
Related Entities
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