“Sol, Terra, and Luna, our GPT-5.6 family of models, are starting to roll out now in ChatGPT, Codex, and the API.”
Three new tiers, codenamed like a NASA mission, a few months after the last point release. The headline feature is an “ultra” mode that spins up four agents to work in parallel, which is a polite way of saying it burns four times the tokens. OpenAI sells that as better outcomes. The meter runs either way, and the meter is the business.