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Function Calling: Responses API vs Chat Completions

This story is from 2026-10-13. It is preserved in the archive; the latest stories are on the live feed.

A wire-level comparison of function definitions, Call IDs, result messages, streaming arguments, authorization, idempotency, and route compatibility. Responses and Chat Completions can both ask an application to run a function, but they represent the tool loop differently. Chat Completions puts too…

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  1. 2026-10-13 05:38 · DEV Community — AI
    Function Calling: Responses API vs Chat Completions

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