Verified90% confidenceFactTime unknown
OpenAI first introduced the Function Calling feature in June 2023, after which Anthropic's Claude and Google's Gemini also successively added support.
7
Sources
90%
Confidence
Long-term
Relevance
6/1/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedTool-calling capability was first introduced into the mainstream large model ecosystem by OpenAI in June 2023 in the form of Function Calling, subsequently released by Anthropic's Claude under the name Tool Use, and later supported by Google's Gemini as well.84% similarVerifiedOpenAI was the first to introduce Function Calling capability in June 2023.83% similar
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