Unverified50% confidenceFactExact time
Tool Calling allows an LLM to decide, during response generation, to invoke predefined external functions or APIs and incorporate the results into subsequent reasoning.
1
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50%
Confidence
Long-term
Relevance
10/12/2026
First Seen
Sources
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Related Claims
VerifiedFunction calling (tool calling) refers to the ability of a large language model to proactively request the invocation of external functions or APIs during the generation of a response.78% similarUnverifiedThe design philosophy of the Response API more closely resembles a function call, where the input is a structured task description and the output is structured data that can be directly consumed by a program.74% similarVerifiedThe tool-calling (Function Calling) mechanism allows the model to invoke external tools during reasoning, such as file read/write operations, terminal commands, and search APIs.73% similarUnverifiedThe Responses API supports orchestrating multi-step reasoning and tool calls within a single API call, eliminating the need for the client to manually manage intermediate state.73% similarUnverifiedAfter receiving a request, the model may return a structured tool call rather than directly providing an answer.73% similar
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