GPT-5.6 Sol Is Here – But You Can’t Use It Yet. Here’s Why.
On June 26, 2026, OpenAI launched its most capable model family to date: GPT-5.6 Sol, Terra, and Luna. Same day that the US government partially lifted restrictions on Anthropic’s Mythos 5. Same week that GPT-4.5 was permanently retired. And yet, despite the launch, the vast majority of ChatGPT users and API developers woke up the … Read more