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OpenAI releases function-calling GPT model snapshots

OpenAI released pinned GPT-4 and GPT-3.5 Turbo snapshots trained to select developer-defined functions and return structured arguments for external tools and APIs.

CURRENT ASSESSMENT · REVISION 1
TOWARD DOOM56confidence 97/100

Why it moved the index

Reliable structured function selection materially improved developers' ability to connect frontier models to consequential external tools, increasing practical agentic capability and downstream deployment.

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Assessment history

  1. R1
    Toward 56 · confidence 97

    New June 2023 exact tool-use model snapshot release.

    12 Aug 2026