OpenAI is testing a new 'Persistent mode' for its Codex AI agent, which would allow it to continue working until explicitly 'put to sleep',[492238] The feature, called 'proactivity,' enables the agent to proactively create follow-up tasks for itself across sessions and using prior interactions and knowledge of the user,[492238] Persistent mode appears in Codex's 'reasoning effort' menu, where users can select the level of computing power, tokens, and time for the AI model to 'think' before answering a prompt,[492238] The code alluding to the feature was spotted in the product's code base, but it has not been rolled out or officially announced yet,[492238] When users have selected Persistent mode, OpenAI's code base reads that Codex will 'continue working until put to sleep',[492238] This contrasts with currently available modes, which will stop working on a task after a few minutes or hours, even if it's not complete,[492238]