GPT-5.6 Terra Pro

GPT-5.6 Terra Pro is OpenAI's mid-tier GPT-5.6 model served with a higher-effort 'pro' reasoning mode, offering the same Terra checkpoint with more compute applied per request for improved answer quality on complex tasks. It supports a 1.05M-token context window, image inputs, and function calling, and is positioned between the economical Luna and flagship Sol tiers. Source: supabase.