OpenAI

GPT-5.6 Luna

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

The provider's own tests

• ExploitGym · The provider · Cyber

  On ExploitGym, again, we see a similar capability spread between GPT-5.4/GPT-5.6-Luna,GPT-5.5/GPT-5.5-TerraandGPT-5.6-Solleadingthe performance/output-tokenfrontier.

  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.

Previous version: GPT-5.5 · Compare the two