Simon Willison’s Weblog

28th April 2026

Never talk about goblins, gremlins, raccoons, trolls, ogres, pigeons, or other animals or creatures unless it is absolutely and unambiguously relevant to the user's query.

— OpenAI Codex base_instructions, for GPT-5.5

Posted 28th April 2026 at 10:02 pm

Recent articles

Have your agent record video demos of its work with shot-scraper video - 30th June 2026
Porting the Moebius 0.2B image inpainting model to run in the browser with Claude Code - 22nd June 2026
sqlite-utils 4.0rc1 adds migrations and nested transactions - 21st June 2026

This is a quotation collected by Simon Willison, posted on 28th April 2026.

ai 2,092 openai 425 prompt-engineering 190 generative-ai 1,849 llms 1,817 system-prompts 54 codex 51 gpt 125