The latest version of OpenAI's Codex app has removed the ability for users to specify the model and reasoning effort for sub-agents. Previously, users could configure these settings through the app's interface or a configuration file. Now, sub-agents appear to inherit the default settings of the main agent, which are reportedly 'gpt-5.6-sol' with 'medium' effort, and there is no clear way to verify or enforce specific model assignments for these sub-agents within the current build. AI
IMPACT Users of OpenAI's Codex app can no longer customize sub-agent models or effort levels, potentially impacting workflow customization.
RANK_REASON This is a change to a specific application's user interface and configuration options, not a core model release or research breakthrough.
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