OPENAI LAUNCHES GPT-5.6 SOL, TERRA, AND LUNA ON APPS AND API

Summary from the TLDR newsletter

OpenAI has released its new frontier model family for ChatGPT Work, Codex, and the OpenAI API. The GPT-5.6 family has three tiers: Sol, the flagship model; Terra, a lower-cost everyday work option; and Luna, the fastest and most affordable model. The series features higher intelligence per token, lower estimated cost for complex work, and stronger agentic performance. There is a new 'ultra' setting that coordinates multiple agents across parallel workstreams for demanding tasks.