GPT-5.1-Codex-Max
GPT-5.1-Codex-Max is available in Codex today for the CLI, IDE extension, cloud, and code review. It is the first model natively trained to operate across multiple context windows through compaction, working over millions of tokens in a single task.
The call on this one
What shipped is free. The call on it, what to do about it and the condition on that, opens with a signup: free, no card, every edition in full.
It becomes $50 a year, and signing up now keeps your first year free.