OpenAI has started previewing its GPT‑5.6 series , which will be available in three versions, to a limited number of trusted partners. The company says the variant Sol is its strongest model yet, while Terra is for everyday use and has a similar performance to GPT‑5.5 despite being twice as cheap. Luna, the last variant, is the company lowest cost model. OpenAI plans to give them a broad release sometime in the coming weeks. The company gave the US government a preview of GPT‑5.6 and its...