Unverified60% confidenceFactExact time
In June 2023, OpenAI standardized tool-calling capabilities through the GPT-4 API for the first time, establishing a unified JSON Schema specification for tool calls, which Anthropic, Google, and others subsequently followed.
2
Sources
60%
Confidence
Long-term
Relevance
7/20/2026
First Seen
Sources
Related Claims
VerifiedStarting from GPT-4, OpenAI introduced Function Calling (later renamed Tool Calling), where developers pass tool schemas to the model as JSON and the model returns structured invocation instructions.79% similarUnverifiedAround 2023, OpenAI, Google, and Anthropic successively incorporated function calling interfaces into their official API specifications.77% similarUnverifiedOpenAI Chat Completions API 于2023年3月随 GPT-3.5-turbo 发布而正式确立，以JSON格式传递消息列表并通过Server-Sent Events实现流式输出77% similarUnverifiedOpenAI等AI服务商提供API接口，开发者可通过标准HTTP请求调用GPT-4、DALL·E等模型能力，按Token计费71% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/575158API
curl https://kongchang.com/api/v1/knowledge/claims/575158MCP
get_claim(id=575158)