GPT-5.4
GPT-5.4 is released in ChatGPT as GPT-5.4 Thinking, the API, and Codex, with GPT-5.4 Pro also available. It scores 83.0% on GDPval, 57.7% on SWE-Bench Pro, 75.0% on OSWorld-Verified, and supports up to 1M tokens of context.
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.