It has most certainly already been extracted and published elsewhere, but I don’t think it’s been posted here yet, so here is the GPT-5.2 Instant system prompt, android app version (EU), extracted today 19-01-2026. Pretty long (42k+ characters)…
There are a few minor formatting mistakes left (missing backticks, the tool definition sections have clear blocks with line breaks, etc…) but too lazy to fix it.
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