OPENAI MIGHT BE PREPARING GPT-5.6 FOR NEXT WEEK'S RELEASE

Summary from the TLDR AI newsletter

OpenAI has moved GPT-5.6 into a narrow preview, splitting it into three tiers: Sol, Terra, and Luna. A notable change includes a new reasoning-effort control slider and an "ultra" mode for handling complex tasks. The release has implications for Codex users, amid Anthropic's Fable 5 changes, while broad access depends on US government review approvals.