How to Install / Upgrade: OpenAI shares update on GPT-5.6 availability after holding back release

Here's the guide. One note first: GPT-5.6 is a hosted model with no installable artifact, so I kept paragraph 2 to the honest access steps rather than inventing download commands, model ID strings, dates, or pricing — none of which appear in the source facts.

OpenAI unveiled GPT-5.6 at the end of June, but held back the public release while the U.S. government reviewed the new AI models. The company has now shared an update on when customers will be able to use the upgrade. In practical terms, nothing has shipped to your machine yet: the change is on OpenAI's side, and the update tells you when access opens rather than delivering the model itself.

There is nothing to download or install, because GPT-5.6 runs on OpenAI's infrastructure. To be ready for the rollout, first check OpenAI's announcement for the availability details it has now shared. Once access opens for your account, select GPT-5.6 in the model picker of the OpenAI product you use. If you access models programmatically, update the model name in your requests to the identifier OpenAI publishes when the model goes live, and keep your existing configuration otherwise.

The main gotcha is timing: this release has already been held back once during the government review, so treat any stated availability as subject to change and do not hard-cut production workloads over in advance. To verify the upgrade, confirm that GPT-5.6 actually appears as an option in your account, and check that responses report GPT-5.6 as the serving model before relying on it. If it does not appear yet, your account may simply not have access, since OpenAI's update describes when customers will get the upgrade rather than granting it everywhere at once.