The Evolution of LLM APIs: From Completions to Tool Calling, Structured Outputs and MCP
The evolution of LLM APIs with verified dates, from the first text-continuing API to the chat format, from function calling to JSON mode and structured outputs, from reasoning parameters to the Model Context Protocol and agents. We see which example in the series each step maps to, and at the end of the series we build a bridge to the next AI series.
6 Nov 2026
·
7 min
·
8
