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Ásgeir Thor JohnsonOpenAI — which file is which product?
The gpt-<version>-thinking/instant.md files are the ChatGPT app system prompts — what chatgpt.com serves for that model. Files ending -api.md are the hidden system messages OpenAI injects on raw API calls (undocumented). Codex/ is the Codex CLI/agent.
| File pattern | Product |
|---|---|
gpt-5.6-sol-extra-high.md, gpt-5.5-thinking.md, gpt-5.5-instant.md, … |
ChatGPT app system prompt for that model |
chatgpt-4.5.md, chatgpt-atlas.md, chatgpt-gpt-5-agent-mode.md |
ChatGPT app (older captures / Atlas browser / agent mode) |
gpt-*-api.md |
Hidden system message injected on API calls |
Codex/ |
Codex CLI / coding agent |
gpt-4o.md |
ChatGPT 4o (includes the deprecation self-funeral protocol, L226+) |
gpt-5-*-personality.md, gpt-5.1-*.md |
ChatGPT personality variants |
tool-*.md |
ChatGPT tool-specific fragments |
Old/ |
Superseded versions · deprecated/ — killed features |