Model & Response Behavior in AI
From the OpenAI Codex cheat sheet · Models, Modes & Permissions · verified Jul 2026
Model & Response Behavior
Switch models, speed tiers, personality, and memory.
text
/model Choose model and reasoning effort
/fast Toggle the Fast service tier
/personality Choose a communication style
/memories Configure memory use and generation📌 /model changes the active session model
⚡ /fast appears only when the model catalog supports it
💬 /personality changes style without replacing instructions
🧠 /memories controls memory use and generation
commandsmodelspersonalitymemory
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