GPT-5.6 "Sol" Explained: What's New, How It Compares to GPT-5, and Why the Rollout Is Restricted

OpenAI previewed GPT-5.6 "Sol" — then limited its rollout after a government request. Here's what's actually confirmed, what isn't yet, and what the restriction signals for frontier-model releases.

06/27/2026 · Industry Trends · 6 min read