Prompt History

System prompt observatory

Prompts change.
We keep the diff.

A focused archive of versioned instruction prompts from Anthropic and OpenAI, organized by product branch and prompt family.

Archive online

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Selected archive

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Browse a model family, choose an exact prompt snapshot, then inspect how its branch changed.

Select a family

Prompt archive

—snapshots
—models

Step 02

Choose a snapshot

Newest first · scroll horizontally

Prompt snapshot

Choose a snapshot

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Step 03 · provenance

Inspect branch changes

Every upstream state that changed a tracked archive prompt, connected to its exact reversible diff.

Selected change set

Select a branch change

    Choose a change to inspect its diff.