OpenAI · 2026-09-23 · notable
Codex CLI 0.156.1 — GPT-6 Sol and Luna join the model picker
Codex CLI 0.156.1 puts GPT-6 Sol and GPT-6 Luna in the model picker, one day after OpenAI launched them. The rate-limit notice now names GPT-6 Luna as the model to switch to when an account runs low.
One day after OpenAI launched them, GPT-6 Sol and GPT-6 Luna are selectable inside the Codex CLI.
What is it?
GPT-6 Sol and GPT-6 Luna are now choices in the Codex CLI model picker, added in release 0.156.1. This is a small follow-up to 0.156.0, which shipped the day before with the optional fullscreen /tui interface, and it exists mainly to wire the two new models into the terminal agent.
How does it work?
Picking either model is a menu selection in the terminal rather than a config file edit, so an open session can move between tiers without restarting a workflow. The rate-limit notification changed alongside it: when an account is running low, Codex CLI now suggests GPT-6 Luna by name instead of only reporting that limits are close.
Why does it matter?
OpenAI positioned Sol and Luna as its mid and low tiers at roughly half the price of GPT-5.6, which only helps terminal users once the agent can actually select them. Shipping that a day later means a long Codex session can drop onto a cheaper model the moment limits start to bite, rather than waiting for the next feature release.
Who is it for?
Codex CLI users watching their rate limits
Try it
npm i -g @openai/codex@0.156.1