Unverified50% confidenceFactExact time
Around 2023, OpenAI, Google, and Anthropic successively incorporated function calling interfaces into their official API specifications.
1
Sources
50%
Confidence
Long-term
Relevance
7/23/2026
First Seen
Sources
Related Claims
VerifiedOpenAI's API interface specification has become the de facto communication standard in the AI industry, and many model providers including Anthropic, Google, and Mistral offer interfaces compatible with this format.80% similarUnverifiedIn 2025, OpenAI made significant updates to its API protocol, introducing new authentication mechanisms and request header formats, which caused the previously simple method of connecting to domestic models by replacing the BaseURL to stop working.79% similarUnverifiedMajor vendors including Google, OpenAI, and Anthropic have all standardized Function Calling as an API capability.79% similar
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