Codex's Dreaming V3 memory system uses GPT-5.6 Luna and Terra by default.
Upgrade by copying the following into config.toml:
extract_model = "gpt-6-luna"
consolidation_model = "gpt-6.1-terra"
Both models are more intelligent AND cheaper than their predecessors.
It's better than a free lunch. It's like getting paid to eat lunch.