GPT-5.6 Review: Three-speed models are on the same stage, is OpenAI playing the efficiency card right?

Spend three times the money to run physics simulation in Ultra mode, but the result is not as good as GPT-5.5? On the first day GPT-5.6 was officially released, the community settled the bill clearly. The Sol is a reliable daily commuter, the Terra is a surprise value-for-money dark horse, and the most expensive Ultra model falls flat on specific tasks. This article will fully reveal the functions, prices, competitive product comparisons and real reputation of the three versions to help you decide whether you should get started. Product Overview On July 10, 2026, OpenAI officially opened the GPT-5.6 series models to the world. Two weeks ago it was only open for preview to a few institutions approved by the US government due to cybersecurity concerns. Now the restrictions have been lifted and all ChatGPT and API