GPT-5.3-Codex-Spark
OpenAI released a research preview of GPT-5.3-Codex-Spark, a smaller GPT-5.3-Codex model that delivers more than 1000 tokens per second on Cerebras hardware, with a 128k context window and text-only input.
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.