gpt-5.6 preview

OpenAI launched GPT-5.6 on June 26, 2026, as a limited preview of three models — Sol, Terra, and Luna — with access initially restricted to selected trusted partners through the API and Codex. The headline is not merely that OpenAI has a stronger model. It is that the strongest consumer-facing...

OpenAI previewed GPT-5.6 on June 26, 2026, in the United States as a restricted rollout of three models, Sol, Terra, and Luna, limiting early access to a small set of trusted partners whose participation was shared with the U.S. government. The launch is less a normal product event than a marker...