OpenAI GPT-5.6 Terra balances intelligence and cost for general-purpose tasks — close to Sol in capability at a lower cost. Same 1,050,000-token context window and 128,000-token max output, with text and image input, web search, and reasoning effort / summary display options. A great default for drafting, translation, summarization, coding Q&A, and data wrangling; step up to Sol for the hardest problems, or down to Luna for high-volume low-stakes calls.