Model family timeline
Last updated Jun 26, 2026
GPT-5.6 model releases
A source-backed timeline for the GPT-5.6 model family, collecting release dates, labs, access details, context windows, and major lifecycle changes.
Most recent in this set
3 models
GPT-5.6 Luna
PreviewLowest-cost GPT-5.6 preview variant in the Sol/Terra/Luna rollout. Access remains limited while U.S. government reviewers evaluate security and misuse concerns.
GPT-5.6 Terra
PreviewMid-tier GPT-5.6 preview variant in the limited Sol/Terra/Luna rollout. Reporting describes Terra as roughly half the price of Sol while still gated by the government-review access process.
GPT-5.6 Sol
PreviewHighest-capability GPT-5.6 preview variant, released only to a small vetted cohort after U.S. government review. Reporting positions Sol as the expensive flagship tier of the Sol/Terra/Luna rollout.