OpenAI

GPT-5.6 Terra

• Released 9 July 2026
• Framework: Preparedness Framework
• 1 test by the provider
• 2 source documents

The provider's own tests

• PostTrainBench Lite · The provider · Autonomy & replication

  gpt-5.6 sol and terra outperform gpt-5.5 at curating training data and executing experiments within the time budget.

  OpenAI · 9 July 2026 · Read the source

No document we read states: whether a capability level was crossed, an independent or government test, a safeguard. No incident on record names this version.

Some documents we hold are stored in lower case only, so their quotes are shown in lower case. The source link opens the original.

Previous version: GPT-5.5 · Compare the two