OpenAI launches GPT-5.6 family with Sol, Terra, Luna

OpenAI launched GPT-5.6, featuring three models: Sol (flagship), Terra (cost-effective), and Luna (fastest). The family rolls out in ChatGPT, Codex, and the API, alongside ChatGPT Work, a new agent for app actions. GPT-5.6 Sol leads in coding, cybersecurity, and science, with Sam Altman claiming a huge step forward in dollars-per-task.