OpenAI: GPT-5.6 Terra

GPT-5.6 Terra, offered by OpenAI, is a powerful language model with a context length of 1,050,000 tokens and supports file, image, and text inputs; it also handles reasoning tasks effectively but lacks structured output support. The model can integrate tools to perform actions based on user requests, making it versatile for various applications. Given its blended benchmark score of 92.7 across three independent benchmarks, GPT-5.6 Terra is suitable for users requiring high performance in agentic and coding tasks. At a cost of $2.0 per million input tokens and $12.0 per million output tokens, it is more expensive than some alternatives but offers robust capabilities; however, its benchmark coverage remains limited to three benchmarks as of the last update on August 24, 2026.